IEC 62386-304:2017

Digital addressable lighting interface - Part 304: Particular requirements - Input devices - Light sensor

IEC 62386-304:2017 specifies a bus system for control by digital signals of electronic lighting equipment which is in line with the requirements of IEC 61347, with the addition of DC supplies.
This document is only applicable to IEC 62386-103:2014 and IEC 62386-­103:2014/AMD1:— input devices that deliver illuminance level information to the lighting control system through light level sensing.

Interface d'éclairage adressable numérique - Partie 304: Exigences particulières - Dispositifs d'entrée - Capteur de luminosité

L'IEC 62386-304:2017 spécifie un système à bus pour la commande par signaux numériques des appareils d’éclairage électroniques conformes aux exigences de l'IEC 61347, en ajoutant les alimentations en courant continu.
Le présent document s'applique uniquement aux dispositifs d'entrée couverts par l'IEC 62386-103:2014 et l'IEC 62386-103:2014/AMD1:—, qui fournissent des informations sur le niveau d'éclairement au système de commande d'éclairage par le biais de la détection du niveau lumineux.

General Information

• Status: Published
• Publication Date: 09-Apr-2024
• ICS: 29.140.50 - Lighting installation systems
• ICS: 29.140.99 - Other standards related to lamps
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• Technical Committee: SC 34C - Auxiliaries for lamps
• Drafting Committee: WG 11 - TC 34/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 19-May-2017
• Completion Date: 26-May-2017

Relations

• Amended By: IEC 62386-304:2017/AMD1:2024 - Amendment 1 - Digital addressable lighting interface - Part 304: Particular requirements - Input devices - Light sensor
• Effective Date: 05-Sep-2023

Overview

IEC 62386-304:2017 (Edition 1.1 consolidated with Amendment 1, 2024) is part of the Digital Addressable Lighting Interface (DALI) series. It defines particular requirements for input devices - light sensors that deliver illuminance-level information to a DALI lighting control system. The standard specifies a digital bus system compatible with IEC 61347 requirements and includes support for DC supplies. IEC 62386-304 is intended to be used in conjunction with IEC 62386-101 and IEC 62386-103.

Key topics and technical requirements

The standard covers the functional and protocol-level details required for interoperable light-sensor input devices:

• Electrical specification and interface power supply - requirements for bus powering and device electrical behaviour.
• Transmission protocol structure and timing - message formats, timing constraints and event encoding for reporting illuminance values.
• Method of operation - instance types, input values, event generation and priority handling for illuminance events.
• Event and reporting controls - configuration of report timers, deadtime timers, hysteresis and event filters to control frequency and sensitivity of notifications.
• Commands and variables - declared device/instance variables and standard commands such as INPUT NOTIFICATION, POWER NOTIFICATION, SET EVENT FILTER, SET REPORT TIMER, SET HYSTERESIS, SET DEADTIME TIMER and related queries.
• Exception handling and diagnostics - handling physical sensor failure, manufacturer-specific errors and error-value reporting.
• Conformance & integration - how Part 304 extends the general input-device requirements in IEC 62386-103 for light-sensing instances.

Practical applications

IEC 62386-304 is used by professionals designing and integrating lighting control systems where automatic daylight or ambient-light regulation is required:

• Lighting-product manufacturers developing DALI-compatible light sensors and input modules.
• Control-system integrators implementing daylight harvesting, presence-aware dimming, or energy-saving strategies in commercial, retail and institutional buildings.
• Specifiers and consultants writing performance and interoperability requirements for smart lighting projects.
• Test laboratories and certification bodies validating compliance with DALI input-device behaviour and messaging.

Implementing devices to this standard enables reliable, interoperable illuminance reporting over the DALI bus for automated lighting controls and building-energy management.

Related standards

• IEC 62386-101: General requirements for system components
• IEC 62386-103: General requirements for control devices (input-device instances)
• IEC 61347: Requirements applicable to lamp controlgear

Keywords: IEC 62386-304, DALI, digital addressable lighting interface, light sensor, illuminance, lighting control, input devices, SET REPORT TIMER, SET HYSTERESIS.

Standards Content (Sample)

IEC 62386-304 ®
Edition 1.1 2024-04
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
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Digital addressable lighting interface –
Part 304: Particular requirements – Input devices – Light sensor

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IEC 62386-304 ®
Edition 1.1 2024-04
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Digital addressable lighting interface –
Part 304: Particular requirements – Input devices – Light sensor
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.140.50; 29.140.99 ISBN 978-2-8322-8754-5
REDLINE VERSION – 2 – IEC 62386-304:2017+AMD1:2024 CSV
© IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General . 9
4.1 General . 9
4.2 Version number . 9
4.3 Insulation . 9
5 Electrical specification . 9
6 Interface power supply . 9
7 Transmission protocol structure . 10
8 Timing . 10
9 Method of operation . 10
9.1 General . 10
9.2 Instance type . 10
9.3 Input signal and value . 10
9.4 Events . 11
9.4.1 Priority use . 11
9.4.2 Bus usage . 11
9.4.3 Encoding . 11
9.4.4 Event configuration . 11
9.4.5 Event generation . 12
9.5 Configuring the input device . 14
9.5.1 Using the report timer . 14
9.5.2 Using the deadtime timer . 15
9.5.3 Setting the timers . 15
9.5.4 Setting the hysteresis . 16
9.5.5 Manual configuration . 16
9.6 Exception handling. 17
9.6.1 Physical sensor failure . 17
9.6.2 Manufacturer specific errors . 17
9.6.3 Error value . 17
10 Declaration of variables . 17
11 Definition of commands . 19
11.1 General . 19
11.2 Overview sheets . 19
11.2.1 General . 19
11.2.2 Standard commands . 19
11.3 Event messages . 19
11.3.1 INPUT NOTIFICATION (device/instance, event) . 19
11.3.2 POWER NOTIFICATION (device) . 19
11.4 Device control instructions . 19
11.5 Device configuration instructions . 19
11.6 Device queries . 20
11.7 Instance control instructions . 20

© IEC 2024
11.8 Instance configuration instructions . 20
11.8.1 General . 20
11.8.2 SET EVENT FILTER (DTR0) . 20
11.8.3 SET REPORT TIMER (DTR0) . 20
11.8.4 SET HYSTERESIS (DTR0) . 20
11.8.5 SET DEADTIME TIMER (DTR0) . 20
11.8.6 SET HYSTERESIS MIN (DTR0). 20
11.9 Instance queries . 20
11.9.1 General . 20
11.9.2 QUERY DEADTIME TIMER . 20
11.9.3 QUERY INSTANCE ERROR . 21
11.9.4 QUERY REPORT TIMER . 21
11.9.5 QUERY HYSTERESIS . 21
11.9.6 QUERY HYSTERESIS MIN . 21
11.10 Special commands . 21
Bibliography . 22

Figure 1 – IEC 62386 graphical overview . 6
Figure 2 – Example of inputValue measured value changes and resultant hysteresis
bands . 14

Table 1 – Illuminance level events . 11
Table 2 – Event filter . 12
Table 3 – Event timer setting . 15
Table 4 – Default and reset values for “hysteresisMin” . 16
Table 5 – “manualCapabilityInstance3xx” values . 17
Table 6 – “instanceErrorByte” values . 17
Table 7 – Declaration of device variables . 18
Table 8 – Restrictions to instance variables defined in IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:— IEC 62386-103:2022 . 18
Table 9 – Declaration of instance variables . 18
Table 10 – Standard commands . 19

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 304: Particular requirements – Input devices –
Light sensor
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 62386-304 edition 1.1 contains the first edition (2017-05) [documents 34C/1314/FDIS
and 34C/1334/RVD] and its amendment 1 (2024-04) [documents 34/1014/CDV and
34/1079A/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2024
International Standard IEC 62386-304 has been prepared by subcommittee 34C: Auxiliaries
for lamps, of IEC technical committee 34: Lamps and related equipment.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 304 of IEC 62386 is intended to be used in conjunction with:
• Part 101, which contains general requirements for system components;
• Part 103, which contains general requirements for control devices.
A list of all parts in the IEC 62386 series, published under the general title: Digital
addressable lighting interface, can be found on the IEC website.
The committee has decided that the contents of this document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
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INTRODUCTION
IEC 62386 contains several parts, referred to as series. The 1xx series includes the basic
specifications. Part 101 contains general requirements for system components, Part 102
extends this information with general requirements for control gear and Part 103 extends it
further with general requirements for control devices.
The 2xx parts extend the general requirements for control gear with lamp specific extensions
(mainly for backward compatibility with Edition 1 of IEC 62386) and with control gear specific
features.
The 3xx parts extend the general requirements for control devices with input device specific
extensions describing the instance types as well as some common features that can be
combined with multiple instance types.
This first edition of IEC 62386-304 is intended to be used in conjunction with
IEC 62386-101:2014, IEC 62386-101:2014/AMD1:— IEC 62386-101:2022, IEC 62386-
103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-103:2022. The division of IEC 62386
into separately published parts provides for ease of future amendments and revisions.
Additional requirements will be added as and when a need for them is recognized.
The setup of the standards is graphically represented in Figure 1 below.
2xx 2xx 2xx 2xx 2xx 3xx 3xx 3xx 3xx 3xx
102 General requirements - 103 General requirements -
Control gear Control devices
101 General requirements -
System components
IEC
Figure 1 – IEC 62386 graphical overview

© IEC 2024
This document, and the other parts that make up the IEC 62386-300 series, in referring to any
of the clauses of IEC 62386-1XX, specifies the extent to which such a clause is applicable
and the order in which the tests are to be performed; the parts also include additional
requirements, as necessary.
Where the requirements of any of the clauses of IEC 62386-1XX are referred to in this
document by the sentence “The requirements of IEC 62386-1XX, Clause “n” apply”, this
sentence is to be interpreted as meaning that all requirements of the clause in question of
Part 1XX apply, except any which are clearly inapplicable.
The standardization of the control interface for control devices is intended to achieve
compatible co-existence and multi-master operation between electronic control gear and
lighting control devices, below the level of building management systems. This document
describes a method of implementing light sensors.
All numbers used in this document are decimal numbers unless otherwise noted. Hexadecimal
numbers are given in the format 0xVV, where VV is the value. Binary numbers are given in
the format XXXXXXXXb or in the format XXXX XXXX, where X is 0 or 1; “x” in binary numbers
means “don't care”.
The following typographic expressions are used:
Variables: “variableName” or “variableName[3:0]”, giving only bits 3 to 0 of “variableName”.
Time value is expressed in minutes and seconds: mm:ss
Range of values: [lowest, highest]
Command: “COMMAND NAME”
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DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 304: Particular requirements – Input devices –
Light sensor
1 Scope
This part of IEC 62386 specifies a bus system for control by digital signals of electronic
lighting equipment which is in line with the requirements of IEC 61347, with the addition of DC
supplies.
This document is only applicable to IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—
input devices that deliver illuminance level information to the lighting control system through
light level sensing.
NOTE Requirements for testing individual products during production are not included.
This part of IEC 62386 is applicable to input devices that provide illuminance level information
to the lighting control system through light level sensing.
This document is only applicable to input devices complying with IEC 62386-103:2022.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62386-101:20142022, Digital addressable lighting interface – Part 101: General
requirements – System components
IEC 62386-101:2014/AMD1:—
IEC 62386-103:20142022, Digital addressable lighting interface – Part 103: General
requirements – Control devices
IEC 62386-103:2014/AMD1:—
IEC 62386-333:— 2018, Digital addressable lighting interface – Part 333: Particular
requirements for control devices – Manual configuration (feature type 33)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62386-101 and
IEC 62386-103 and the following apply.
_______________
Under preparation. Stage at the time of publication: IEC ACDV 62386-101/AMD1:2017.
Under preparation. Stage at the time of publication: IEC ACDV 62386-103/AMD1:2017.
Under preparation. Stage at the time of publication: IEC CCDV 62386-333:2017.

© IEC 2024
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
instance
illuminance level input signal processing unit of an input device
[SOURCE: IEC 62386-101:20142022, 3.29, modified — addition of "illuminance level input"]
3.2
strictly monotonic
either entirely increasing or decreasing without repeating values
Note 1 to entry: Function f defined on a subset of the real numbers with real values is called monotonically
increasing, if for all x and y such that x < y one has f(x) < f(y), so f preserves the order. Likewise, a function is
called monotonically decreasing if, whenever x < y, then f(x) > f(y), so it reverses the order. For this document
strictly monotonic is defined as monotonically increasing.
4 General
4.1 General
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 4 apply, with the restrictions, changes and additions identified below.
4.2 Version number
In 4.2 of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-103:2022, “103”
shall be replaced by “304”, “version number” shall be replaced by “extended version number”
and “versionNumber” shall be replaced by " extendedVersionNumber".
4.3 Insulation
According to IEC 61347-1 applicable safety standards, it might can be required that the input
device has at least supplementary insulation to accessible parts. This depends on the
connected components. In this case special attention should be paid with respect to the
sensor(s) being used.
NOTE IEC-62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-103:2022 requires system components
to have at least basic insulation.
5 Electrical specification
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 5 apply.
6 Interface power supply
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 6 apply.
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7 Transmission protocol structure
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 7 apply.
NOTE Subclause 9.4 provides detailed event information applicable to instances.
8 Timing
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 8 apply.
9 Method of operation
9.1 General
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 9 apply, with the following restrictions and additions.
9.2 Instance type
The instance type (“instanceType”) shall be equal to 4.
9.3 Input signal and value
The “inputValue” shall indicate the illuminance of the light at the sensor surface. The
measured value shall contain the measured illuminance with a precision of "resolution" bits
and shall be encoded in "inputValue" as described in IEC 62386-103:2022, 9.8.2. The resulting
“inputValue” measured value shall be a strictly monotonic function of the illuminance level.
NOTE The illuminance value is a relative value, and is not representing absolute lux values.
After receiver start-up, it can take the sensor some time before valid illuminance level
measurements are obtained. During this time, "inputValue" shall be MASK. After the first valid
illuminance level measurement is obtained, "inputValue" shall not be MASK, except in the case
of physical sensor failure (see 9.6.1).
Examples of "inputValue" MASK values and highest valid values, for several values of
"resolution":
– "resolution" = 4: "inputValue" is a 1-byte value
• MASK is 0xFF, resulting in a QUERY INPUT VALUE reply of 0xFF.
• For a valid illuminance level measurement, the highest possible measured value is
0xE, which results in the 1-byte "inputValue" of 0xEE.
– "resolution" = 9: "inputValue" is a 2-byte value
• MASK is 0xFFFF, resulting in a QUERY INPUT VALUE reply of 0xFF and a QUERY
INPUT VALUE LATCH reply of 0xFF.
• For a valid illuminance level measurement, the highest possible measured value is
0x1FE, which results in the 2-byte "inputValue" of 0xFF7F.
– "resolution" = 18: "inputValue" is a 3-byte value
• MASK is 0xFFFFFF, resulting in a QUERY INPUT VALUE reply of 0xFF and replies of
0xFF for each of the two QUERY INPUT VALUE LATCH commands sent after QUERY
INPUT VALUE.
• For a valid illuminance level measurement, the highest possible measured value is
0x3FFFE, which results in the 3-byte "inputValue" of 0xFFFFBF.

© IEC 2024
9.4 Events
9.4.1 Priority use
9.4.1.1 General
The default “eventPriority” shall be priority 4. Since the application controller needs a timeslot
to respond, “eventPriority” should not be set to 2.
9.4.1.2 Periodic events
The periodic “INPUT NOTIFICATION” message triggered by the report timer that reports the
illumination level event shall always be sent with priority 5.
9.4.2 Bus usage
9.4.2.1 Instance level
Multiple events from an instance shall not be sent in a transaction. There is a configurable
delay T that shall be taken into account. See 9.5.2 for more information.
deadtime
9.4.2.2 Device level
At the device level, events from different instances may be sent in a transaction.
9.4.3 Encoding
Illuminance level events shall be encoded as shown in Table 1.
Table 1 – Illuminance level events
Event name Event Description
information
illuminance level illuminanceEvent An illuminance level report, passing the actual illuminance level along.
report
The event information shall be encoded as follows:
• if “resolution” ≤ 10: “illuminanceEvent” shall be encoded in such a way that the resulting
event information is a 10-bit value, according to IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:— IEC 62386-103:2022, 9.8.2;
• in all other cases: “illuminanceEvent” shall provide the 10 MSB bits of the “inputValue”.
9.4.4 Event configuration
The application controller may not need all the events mentioned in 9.4.1. The instance shall
allow the application controller to set the “eventFilter” (see IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:—, 9.7.4) to inhibit those events that the application controller
does not need. For this document, “eventFilter” shall be reduced to one byte.
Events shall be enabled or disabled according to the value of "eventFilter". For this document,
"eventFilter" shall be reduced to one byte. No configuration of "eventFilter" shall prevent the
periodic "INPUT NOTIFICATION" message triggered by the report timer (9.5.1).
NOTE Inhibiting events increases the effective bus bandwidth availability.
The “eventFilter” shall have the definition as given in Table 2:

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Table 2 – Event filter
Bit Description Value Default
0 Illuminance level event enabled? "1" = "Yes" 1
1 Reserved 0 0
2 Reserved 0 0
3 Reserved 0 0
4 Reserved 0 0
5 Reserved 0 0
6 Reserved 0 0
7 Reserved 0 0
The filter can be set via “SET EVENT FILTER (DTR0)” and be queried using
“QUERY EVENT FILTER 0-7”, see IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—
IEC 62386-103:2022 for details.
9.4.5 Event generation
The illuminance level event is a report of the “inputValue” measured value (see IEC 62386-
103:2022, 9.8). In order to avoid flooding the system with too many events on small
illuminance level changes, a hysteresis band is introduced. This hysteresis band is restricted
by its upper (“hysteresisBandHigh”) and lower (“hysteresisBandLow”) boundaries. The height of
the hysteresis band (“hysteresisBand”), has a direct impact on how sensitive the input device
responds to changes of illuminance level and therefore event generation. The hysteresis band
is not symmetrically arranged towards “inputValue” the measured value. Depending on the
direction of the last change of “inputValue” measured value, the hysteresis band is spanned
above or below “inputValue” the measured value.
The illuminance level event shall be generated
• each time “inputValue” the measured value becomes greater than “hysteresisBandHigh” or
less than “hysteresisBandLow”, or;
• after a timeout of T since the previous illuminance level report, irrespective of the
report
actual “inputValue” measured value.
The power on values of “hysteresisBandLow” and “hysteresisBandHigh” are 0, such that the first
non-zero value of “inputValue” the measured value shall cause the illuminance level event to
be generated according to the first condition shown above. See 9.5.4 for details.
In case a new event occurs before the current event has been sent, the new event shall
replace the current event. This could be caused, for example, by bus unavailability or the
deadtime timer.
Each time the illuminance level event is sent because “inputValue” the measured value is
outside of the range [“hysteresisBandLow”, “hysteresisBandHigh”], then the values of
“hysteresisBandLow” and “hysteresisBandHigh” shall be recalculated as follows:
• “hysteresisBand” is calculated as the maximum of:
– “hysteresis” percentage of “inputValue” the measured value, and
– “hysteresisMin”
• If “inputValue” the measured value is greater than “hysteresisBandHigh”, then:
– “hysteresisBandHigh” is set to “inputValue” the measured value, and
– “hysteresisBandLow” is set to max (“inputValue” measured value – “hysteresisBand”,0)

© IEC 2024
• If “inputValue” the measured value is less than “hysteresisBandLow”, then:
– “hysteresisBandLow” is set to “inputValue” the measured value, and
– “hysteresisBandHigh” is set to “inputValue” the measured value + “hysteresisBand”
NOTE It is possible for “hysteresisBandHigh” to exceed the maximum possible “inputValue” measured value in
cases where “inputValue” the measured value is large and hysteresis is increased. Software developers can choose
to limit “hysteresisBandHigh” to the maximum possible “inputValue” measured value.
Figure 2 shows an example of “inputValue” measured value changes, together with the
resultant hysteresis bands (vertical lines) for the case where “hysteresis” is 10 % and
“hysteresisMin” is 50. At measurements 1, 2, 4, 5, 6, 8 and 10, the illuminance level event is
generated due to the new “inputValue” measured value being outside of the previously
calculated range of [“hysteresisBandLow”, “hysteresisBandHigh”]. Measurements 3, 7 and 9 do
not generate the illuminance level event because the “inputValue” measured value is inside
the previously calculated range of [“hysteresisBandLow, “hysteresisBandHigh”]. The initial values
for “hysteresisBandLow” and “hysteresisBandHigh” are 0 due to power up of the device.

REDLINE VERSION – 14 – IEC 62386-304:2017+AMD1:2024 CSV
© IEC 2024
hyteresisBandHigh
hyteresisBandLow
1 2 3 4 5 6 7 8 9 10
Measurement number
IEC
Figure 2 – Example of inputValue measured value changes and resultant hysteresis
bands
9.5 Configuring the input device
9.5.1 Using the report timer
If the report timer is set, it shall generate a ‘repeat’ trigger every T even if the “inputValue”
report
has not changed. The report timer shall be restarted every time an event is sent.
The report timer shall be started,
inputValue (and resulting hysteresis band)

© IEC 2024
• at power-on: if enabled, immediately after both the receiver has started up and the
illuminance level measurement has become valid, with the time to the first trigger
recommended to be shortened to a random time between 0 s and T s;
report
• otherwise immediately after enablement.
This implies that the first "INPUT NOTIFICATION" message due to the report timer is sent at
a maximum time of T after starting. This may be delayed by other "INPUT
report
NOTIFICATION" messages, or by bus availability.
NOTE If multiple devices have the report timer enabled, they might send out conflicting data intended used by
application controllers to affect control the same control gear. Depending on the application, care needs to be
taken when enabling the report timer. Application controllers can avoid this problem by enabling the report timer
only when required.
9.5.2 Using the deadtime timer
If the deadtime timer is set, the instance shall not send out an event until the deadtime timer
has expired. The deadtime timer shall be restarted every time an event is sent.
9.5.3 Setting the timers
The event deadtime and report timers shall be programmable as is indicated in Table 3.
For each timer, a fixed minimum duration and a fixed increment in duration are given. The
application controller can set the desired actual timer duration by setting the number of
increments to a value in the range [0,255]. The resulting time shall be strictly monotonic
according to the following formula:
Time = T * multiplier
incr
Only on (re-)starting a timer the actual time shall be calculated based on the corresponding
variable. This implies that the times only change after any running timer has been cancelled
or expired. The tolerance on the time shall be ±5 %.
Table 3 – Event timer setting
Time Multiplier Default value T T T T
incr default min max
T “tDeadtime” 30 50 ms 1,5 s 0 s 12,75 s
deadtime
T “tReport” 30 1 s 30 s 1 s 4 min 15 s
report
The input device shall expose the following operations to set and observe the timer
multipliers:
• “SET REPORT TIMER (DTR0)”, “QUERY REPORT TIMER” to set or query "tReport";
• “SET DEADTIME TIMER (DTR0)”, “QUERY DEADTIME TIMER” to set or query “t ”.
Deadtime
“SET REPORT TIMER (DTR0)” shall set "tReport" depending on "DTR0". If "tReport" is set to 0,
the report timer shall be disabled immediately.
“SET DEADTIME TIMER (DTR0)” shall set "tDeadtime" depending on "DTR0". If "tDeadtime" is
set to 0, the deadtime timer shall be disabled immediately, but shall not affect T until the
report
report timer is (re-)started.
If T < T , T shall be T (independent of the value of “tReport”).
report deadtime report deadtime

REDLINE VERSION – 16 – IEC 62386-304:2017+AMD1:2024 CSV
© IEC 2024
9.5.4 Setting the hysteresis
The height of the hysteresis band, “hysteresisBand”, is calculated according to 9.4.5 using the
percentage given by “hysteresis” with the minimum height given by “hysteresisMin”. The input
device shall support a hysteresis up to 25 %. A value of zero for “hysteresis” shall lead to
illuminance level events based on T only. The lowest value in the hysteresis band is
report
given by “hysteresisBandLow”, and the highest value by “hysteresisBandHigh” – see 9.4.5. The
input device shall expose the following operations to set and observe the values of “hysteresis”
and “hysteresisMin”:
• “SET HYSTERESIS (DTR0)”, “QUERY HYSTERESIS” to set or query “hysteresis”.
“SET HYSTERESIS (DTR0)” shall set “hysteresis” depending on the “DTR0” value as follows:
• if “DTR0” > 25: no change;
• in all other cases: “DTR0”.
Since a hysteresis in percent would require a growing resolution in case the “inputValue” is
low, the minimum value for the hysteresis is physically limited. To avoid unwanted events at
low illumination levels, the minimum value for the hysteresis can also be set as an absolute
value “hysteresisMin”:
• “SET HYSTERESIS MIN (DTR0)”, “QUERY HYSTERESIS MIN” to set or query
“hysteresisMin”.
“SET HYSTERESIS MIN (DTR0)” shall set “hysteresisMin” to “DTR0”.
NOTE After power-up, “hysteresisBand” can be greater than (“hysteresisBandHigh”-“hysteresisBandLow”) until
“inputValue” the measured value is greater than or equal to “hysteresisMin”.
The default value for “hysteresisMin” shall depend on ‘resolution’ as defined in Table 4.
Table 4 – Default and reset values for “hysteresisMin”
“resolution” Factory default and reset value for “hysteresisMin”
1-6 0
7 1
8 2
9 5
10 10
11 20
12 40
13 81
14 163
>=15 255
NOTE The default value is approximately 1 %.
9.5.5 Manual configuration
If IEC 62386-333 is implemented, the instance level variables according to Table 5 may be
manually configured. QUERY MANUAL CONFIGURATION CAPABILITY 3xx (see
IEC 62386-333) shall return the byte as defined in Table 5:

© IEC 2024
Table 5 – “manualCapabilityInstance3xx” values
Bit Description Value
0 Manual configuration of “tReport” supported “1” = “Yes”
1 Manual configuration of “tDeadtime” supported “1” = “Yes”
2 Manual configuration of “hysteresis” supported “1” = “Yes”
3 Manual configuration of “hysteresisMin” supported “1” = “Yes”
4 Reserved “0”
5 Reserved “0”
6 Reserved “0”
7 Reserved “0”
9.6 Exception handling
9.6.1 Physical sensor failure
If a physical sensor failure is detected, the instance shall set “instanceError” to TRUE, from
the moment the failure is detected until the failure is resolved. While the error is detected, no
further events shall be sent and "inputValue" shall be set to MASK as defined in 9.3.
9.6.2 Manufacturer specific errors
If a manufacturer specific error is detected, the instance shall set “instanceError” to TRUE,
from the moment the error occurs until the error is gone.
9.6.3 Error value
“instanceError” can be observed via “QUERY INSTANCE STATUS”.
While “instanceError” is set, “QUERY INSTANCE ERROR” shall return “instanceErrorByte”
according to Table 6:
Table 6 – “instanceErrorByte” values
Bit Description Value
0 Physical sensor failure? "1" = "Yes"
1 Reserved “0”
2 Reserved “0”
3 Reserved “0”
4 Manufacturer specific error 1? "1" = "Yes"
5 Manufacturer specific error 2? "1" = "Yes"
6 Manufacturer specific error 3? "1" = "Yes"
7 Manufacturer specific error 4? “1” = “Yes”

If used, the meaning of bits [7:4] of “instanceErrorByte” shall be documented in the
manual/documentation. The impact on event generation shall also be documented.
10 Declaration of variables
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-
103:2022, Clause 10 apply, with the following considerations.

REDLINE VERSION – 18 – IEC 62386-304:2017+AMD1:2024 CSV
© IEC 2024
Table 7 shows additions to the device variables.
Table 7 – Declaration of device variables
Variable Default value Reset value Power on value Range of Memory type
(factory) validity
“extendedVersionNu 2.0 no change no change 00001000b ROM
mber”
Table 8 shows restrictions to the instance variables.
Table 8 – Restrictions to instance variables defined in IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:— IEC 62386-103:2022
Variable Default Reset value Power on value Range of Memory type
value validity
(factory)
“instanceType” 4 no change no change 4 ROM
a
“eventFilter” 1 1 no change 0000 000x NVM
“eventPriority” 4 4 no change [2,5] NVM
a
"instanceConfiguration[x]" reserved reserved reserved reserved reserved
a
The value should reflect the actual situation as soon as possible. Where x is in the range [0,190].

NOTE “resolution”, “inputValue” and “eventPriority” are according to their respective definitions in
IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:— IEC 62386-103:2022.
Table 9 shows additions to the instance variables.
Table 9 – Declaration of instance variables
Variable Default value Reset value Power on Range of Memory type
(factory) value validity
a
b
“instanceErrorByte” no change 0 xxxx 0000b RAM
xxxx 000xb
a
“hysteresisBand” no change 0 [0,max(“inputValue”)] RAM
"resolution"
[0,2 – 2]
a
“hysteresisBandHigh” no change 0 [“hysteresisBandLow”, RAM
max(“inputValue”)]
["hysteresisBandLow",
"resolution"
2 – 2]
a
“hysteresisBandLow” no change 0 [0, RAM
“hysteresisBandHigh”]
“tReport” 30 30 no change [0,255] NVM
“tDeadtime” 30 30 no change [0,255] NVM
“hysteresisMin” See Table 4 See Table 4 no change [0,255] NVM
“hysteresis” 5 5 no change [0,25] NVM
a
Not applicable.
b
The value should reflect the actual situation as soon as possible.

© IEC 2024
11 Definition of commands
11.1
...

IEC 62386-304 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface –
Part 304: Particular requirements – Input devices – Light sensor

Interface d'éclairage adressable numérique –
Partie 304: Exigences particulières – Dispositifs d'entrée – Capteur de
luminosité
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IEC 62386-304 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface –

Part 304: Particular requirements – Input devices – Light sensor

Interface d'éclairage adressable numérique –

Partie 304: Exigences particulières – Dispositifs d'entrée – Capteur de

luminosité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.50; 29.140.99 ISBN 978-2-8322-4344-2

– 2 – IEC 62386-304:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General . 9
4.1 General . 9
4.2 Version number . 9
4.3 Insulation . 9
5 Electrical specification . 9
6 Interface power supply . 9
7 Transmission protocol structure . 9
8 Timing . 9
9 Method of operation . 10
9.1 General . 10
9.2 Instance type . 10
9.3 Input signal and value . 10
9.4 Events . 10
9.4.1 Priority use . 10
9.4.2 Bus usage . 10
9.4.3 Encoding . 10
9.4.4 Event configuration . 11
9.4.5 Event generation . 11
9.5 Configuring the input device . 13
9.5.1 Using the report timer . 13
9.5.2 Using the deadtime timer . 13
9.5.3 Setting the timers . 13
9.5.4 Setting the hysteresis . 13
9.5.5 Manual configuration . 14
9.6 Exception handling. 15
9.6.1 Physical sensor failure . 15
9.6.2 Manufacturer specific errors . 15
9.6.3 Error value . 15
10 Declaration of variables . 15
11 Definition of commands . 16
11.1 General . 16
11.2 Overview sheets . 17
11.2.1 General . 17
11.2.2 Standard commands . 17
11.3 Event messages . 17
11.3.1 INPUT NOTIFICATION (device/instance, event) . 17
11.3.2 POWER NOTIFICATION (device) . 17
11.4 Device control instructions . 17
11.5 Device configuration instructions . 17
11.6 Device queries . 17
11.7 Instance control instructions . 17

11.8 Instance configuration instructions . 18
11.8.1 General . 18
11.8.2 SET EVENT FILTER (DTR0) . 18
11.8.3 SET REPORT TIMER (DTR0) . 18
11.8.4 SET HYSTERESIS (DTR0) . 18
11.8.5 SET DEADTIME TIMER (DTR0) . 18
11.8.6 SET HYSTERESIS MIN (DTR0). 18
11.9 Instance queries . 18
11.9.1 General . 18
11.9.2 QUERY DEADTIME TIMER . 18
11.9.3 QUERY INSTANCE ERROR . 18
11.9.4 QUERY REPORT TIMER . 19
11.9.5 QUERY HYSTERESIS . 19
11.9.6 QUERY HYSTERESIS MIN . 19
11.10 Special commands . 19
Bibliography . 20

Figure 1 – IEC 62386 graphical overview . 6
Figure 2 – Example of inputValue changes and resultant hysteresis bands . 12

Table 1 – Illuminance level events . 10
Table 2 – Event filter . 11
Table 3 – Event timer setting . 13
Table 4 – Default and reset values for “hysteresisMin” . 14
Table 5 – “manualCapabilityInstance3xx” values . 15
Table 6 – “instanceErrorByte” values . 15
Table 7 – Declaration of device variables . 16
Table 8 – Restrictions to instance variables defined in IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:— . 16
Table 9 – Declaration of instance variables . 16
Table 10 – Standard commands . 17

– 4 – IEC 62386-304:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 304: Particular requirements – Input devices –
Light sensor
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62386-304 has been prepared by subcommittee 34C: Auxiliaries
for lamps, of IEC technical committee 34: Lamps and related equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
34C/1314/FDIS 34C/1334/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 304 of IEC 62386 is intended to be used in conjunction with:

• Part 101, which contains general requirements for system components;
• Part 103, which contains general requirements for control devices.
A list of all parts in the IEC 62386 series, published under the general title: Digital
addressable lighting interface, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62386-304:2017 © IEC 2017
INTRODUCTION
IEC 62386 contains several parts, referred to as series. The 1xx series includes the basic
specifications. Part 101 contains general requirements for system components, Part 102
extends this information with general requirements for control gear and Part 103 extends it
further with general requirements for control devices.
The 2xx parts extend the general requirements for control gear with lamp specific extensions
(mainly for backward compatibility with Edition 1 of IEC 62386) and with control gear specific
features.
The 3xx parts extend the general requirements for control devices with input device specific
extensions describing the instance types as well as some common features that can be
combined with multiple instance types.
This first edition of IEC 62386-304 is intended to be used in conjunction with
IEC 62386-101:2014, IEC 62386-101:2014/AMD1:—, IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:—. The division of IEC 62386 into separately published parts
provides for ease of future amendments and revisions. Additional requirements will be added
as and when a need for them is recognized.
The setup of the standards is graphically represented in Figure 1 below.
2xx 2xx 2xx 2xx 2xx 3xx 3xx 3xx 3xx 3xx
102 General requirements - 103 General requirements -
Control gear Control devices
101 General requirements -
System components
IEC
Figure 1 – IEC 62386 graphical overview
This document, and the other parts that make up the IEC 62386-300 series, in referring to any
of the clauses of IEC 62386-1XX, specifies the extent to which such a clause is applicable
and the order in which the tests are to be performed; the parts also include additional
requirements, as necessary.
Where the requirements of any of the clauses of IEC 62386-1XX are referred to in this
document by the sentence “The requirements of IEC 62386-1XX, Clause “n” apply”, this
sentence is to be interpreted as meaning that all requirements of the clause in question of
Part 1XX apply, except any which are clearly inapplicable.
The standardization of the control interface for control devices is intended to achieve
compatible co-existence and multi-master operation between electronic control gear and
lighting control devices, below the level of building management systems. This document
describes a method of implementing light sensors.

All numbers used in this document are decimal numbers unless otherwise noted. Hexadecimal
numbers are given in the format 0xVV, where VV is the value. Binary numbers are given in
the format XXXXXXXXb or in the format XXXX XXXX, where X is 0 or 1; “x” in binary numbers
means “don't care”.
The following typographic expressions are used:
Variables: “variableName” or “variableName[3:0]”, giving only bits 3 to 0 of “variableName”.
Time value is expressed in minutes and seconds: mm:ss
Range of values: [lowest, highest]
Command: “COMMAND NAME”
– 8 – IEC 62386-304:2017 © IEC 2017
DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 304: Particular requirements – Input devices –
Light sensor
1 Scope
This part of IEC 62386 specifies a bus system for control by digital signals of electronic
lighting equipment which is in line with the requirements of IEC 61347, with the addition of DC
supplies.
This document is only applicable to IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—
input devices that deliver illuminance level information to the lighting control system through
light level sensing.
NOTE Requirements for testing individual products during production are not included.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62386-101:2014, Digital addressable lighting interface – Part 101: General requirements
– System components
IEC 62386-101:2014/AMD1:—
IEC 62386-103:2014, Digital addressable lighting interface – Part 103: General requirements
– Control devices
IEC 62386-103:2014/AMD1:—
IEC 62386-333:— , Digital addressable lighting interface – Part 333: Particular requirements
for control devices – Manual configuration (feature type 33)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62386-101 and
IEC 62386-103 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
_______________
Under preparation. Stage at the time of publication: IEC ACDV 62386-101/AMD1:2017.
Under preparation. Stage at the time of publication: IEC ACDV 62386-103/AMD1:2017.
Under preparation. Stage at the time of publication: IEC CCDV 62386-333:2017.

3.1
instance
illuminance level input signal processing unit of an input device
[SOURCE: IEC 62386-101:2014, 3.29, modified — addition of "illuminance level input"]
3.2
strictly monotonic
either entirely increasing or decreasing without repeating values
Note 1 to entry: Function f defined on a subset of the real numbers with real values is called monotonically
increasing, if for all x and y such that x < y one has f(x) < f(y), so f preserves the order. Likewise, a function is
called monotonically decreasing if, whenever x < y, then f(x) > f(y), so it reverses the order. For this document
strictly monotonic is defined as monotonically increasing.
4 General
4.1 General
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 4 apply,
with the restrictions, changes and additions identified below.
4.2 Version number
In 4.2 of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, “103” shall be replaced by
“304”, “version number” shall be replaced by “extended version number” and “versionNumber”
shall be replaced by " extendedVersionNumber".
4.3 Insulation
According to IEC 61347-1 it might be required that the input device has at least
supplementary insulation. This depends on the connected components. In this case special
attention should be paid with respect to the sensor(s) being used.
NOTE IEC-62386-103:2014 and IEC 62386-103:2014/AMD1:— requires system components to have at least basic
insulation.
5 Electrical specification
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 5 apply.
6 Interface power supply
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 6 apply.
7 Transmission protocol structure
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 7 apply.
NOTE Subclause 9.4 provides detailed event information applicable to instances.
8 Timing
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 8 apply.

– 10 – IEC 62386-304:2017 © IEC 2017
9 Method of operation
9.1 General
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 9 apply,
with the following restrictions and additions.
9.2 Instance type
The instance type (“instanceType”) shall be equal to 4.
9.3 Input signal and value
The “inputValue” shall indicate the illuminance of the light at the sensor surface. The resulting
“inputValue” shall be a strictly monotonic function of the illuminance level.
NOTE The illuminance value is a relative value, and is not representing absolute lux values.
9.4 Events
9.4.1 Priority use
9.4.1.1 General
The default “eventPriority” shall be priority 4. Since the application controller needs a timeslot
to respond, “eventPriority” should not be set to 2.
9.4.1.2 Periodic events
The periodic “INPUT NOTIFICATION” message triggered by the report timer that reports the
illumination level event shall always be sent with priority 5.
9.4.2 Bus usage
9.4.2.1 Instance level
Multiple events from an instance shall not be sent in a transaction. There is a configurable
delay T that shall be taken into account. See 9.5.2 for more information.
deadtime
9.4.2.2 Device level
At the device level, events from different instances may be sent in a transaction.
9.4.3 Encoding
Illuminance level events shall be encoded as shown in Table 1.
Table 1 – Illuminance level events
Event name Event Description
information
illuminance level illuminanceEvent An illuminance level report, passing the actual illuminance level along.
report
The event information shall be encoded as follows:
• if “resolution” ≤ 10: “illuminanceEvent” shall be encoded in such a way that the resulting
event information is a 10-bit value, according to IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:—, 9.8.2;

• in all other cases: “illuminanceEvent” shall provide the 10 MSB bits of the “inputValue”.
9.4.4 Event configuration
The application controller may not need all the events mentioned in 9.4.1. The instance shall
allow the application controller to set the “eventFilter” (see IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:—, 9.7.4) to inhibit those events that the application controller
does not need. For this document, “eventFilter” shall be reduced to one byte.
NOTE Inhibiting events increases the effective bus bandwidth availability.
The “eventFilter” shall have the definition as given in Table 2:
Table 2 – Event filter
Bit Description Value Default
0 Illuminance level event enabled? "1" = "Yes" 1
1 Reserved 0 0
2 Reserved 0 0
3 Reserved 0 0
4 Reserved 0 0
5 Reserved 0 0
6 Reserved 0 0
7 Reserved 0 0
The filter can be set via “SET EVENT FILTER (DTR0)” and be queried using
“QUERY EVENT FILTER 0-7”, see IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—
for details.
9.4.5 Event generation
The illuminance level event is a report of the “inputValue”. In order to avoid flooding the
system with too many events on small illuminance level changes, a hysteresis band is
introduced. This hysteresis band is restricted by its upper (“hysteresisBandHigh”) and lower
(“hysteresisBandLow”) boundaries. The height of the hysteresis band (“hysteresisBand”), has a
direct impact on how sensitive the input device responds to changes of illuminance level and
therefore event generation. The hysteresis band is not symmetrically arranged towards
“inputValue”. Depending on the direction of the last change of “inputValue” the hysteresis
band is spanned above or below “inputValue”.
The illuminance level event shall be generated
• each time “inputValue” becomes greater than “hysteresisBandHigh” or less than
“hysteresisBandLow”, or;
• after a timeout of T since the previous illuminance level report, irrespective of the
report
actual “inputValue”.
The power on values of “hysteresisBandLow” and “hysteresisBandHigh” are 0, such that the first
non-zero value of “inputValue” shall cause the illuminance level event to be generated
according to the first condition shown above. See 9.5.4 for details.
In case a new event occurs before the current event has been sent, the new event shall
replace the current event. This could be caused, for example, by bus unavailability or the
deadtime timer.
– 12 – IEC 62386-304:2017 © IEC 2017
Each time the illuminance level event is sent because “inputValue” is outside of the range
[“hysteresisBandLow”, “hysteresisBandHigh”], then the values of “hysteresisBandLow” and
“hysteresisBandHigh” shall be recalculated as follows:
• “hysteresisBand” is calculated as the maximum of:
– “hysteresis” percentage of “inputValue”, and
– “hysteresisMin”
• If “inputValue” is greater than “hysteresisBandHigh”, then:
– “hysteresisBandHigh” is set to “inputValue”, and
– “hysteresisBandLow” is set to max (“inputValue” – “hysteresisBand”,0)
• If “inputValue” is less than “hysteresisBandLow”, then:
– “hysteresisBandLow” is set to “inputValue”, and
– “hysteresisBandHigh” is set to “inputValue” + “hysteresisBand”
NOTE It is possible for “hysteresisBandHigh” to exceed the maximum possible “inputValue” in cases where
“inputValue” is large and hysteresis is increased. Software developers can choose to limit “hysteresisBandHigh” to
the maximum possible “inputValue”.
Figure 2 shows an example of “inputValue” changes, together with the resultant hysteresis
bands (vertical lines) for the case where “hysteresis” is 10 % and “hysteresisMin” is 50. At
measurements 1, 2, 4, 5, 6, 8 and 10, the illuminance level event is generated due to the new
“inputValue” being outside of the previously calculated range of [“hysteresisBandLow”,
“hysteresisBandHigh”]. Measurements 3, 7 and 9 do not generate the illuminance level event
because the “inputValue” is inside the previously calculated range of [“hysteresisBandLow,
“hysteresisBandHigh”]. The initial values for “hysteresisBandLow” and “hysteresisBandHigh” are 0
due to power up of the device.
hyteresisBandHigh
hyteresisBandLow
1 2 3 4 5 6 7 8 9 10
Measurement number
IEC
Figure 2 – Example of inputValue changes and resultant hysteresis bands
inputValue (and resulting hysteresis band)

9.5 Configuring the input device
9.5.1 Using the report timer
If the report timer is set, it shall generate a ‘repeat’ trigger every T even if the “inputValue”
report
has not changed. The report timer shall be restarted every time an event is sent.
If multiple devices have the report timer enabled, they might send out conflicting data
intended to affect the same control gear. Depending on the application, care needs to be
taken when enabling the report timer.
9.5.2 Using the deadtime timer
If the deadtime timer is set, the instance shall not send out an event until the deadtime timer
has expired. The deadtime timer shall be restarted every time an event is sent.
9.5.3 Setting the timers
The event report timer shall be programmable as is indicated in Table 3.
For each timer, a fixed minimum duration and a fixed increment in duration are given. The
application controller can set the desired actual timer duration by setting the number of
increments to a value in the range [0,255]. The resulting time shall be strictly monotonic
according to the following formula:
Time = T * multiplier
incr
Only on (re-)starting a timer the actual time shall be calculated based on the corresponding
variable. This implies that the times only change after any running timer has been cancelled
or expired. The tolerance on the time shall be ±5 %.
Table 3 – Event timer setting
Time Multiplier Default value T T T T
incr default min max
T “tDeadtime” 30 50 ms 1,5 s 0 s 12,75 s
deadtime
T “tReport”
30 1 s 30 s 1 s 4 min 15 s
report
The input device shall expose the following operations to set and observe the timer
multipliers:
• “SET REPORT TIMER (DTR0)”, “QUERY REPORT TIMER”;
• “SET DEADTIME TIMER (DTR0)”, “QUERY DEADTIME TIMER” to set or query “t ”.
Deadtime
“SET REPORT TIMER (DTR0)” shall set “tReport” depending on “DTR0“. If “tReport” is set to 0,
the report timer shall be disabled.
“SET DEADTIME TIMER (DTR0)” shall set “tDeadtime” depending on “DTR0”. If “tDeadtime” is
set to 0, the deadtime timer shall be disabled.
If T < T , T shall be T (independent of the value of “tReport”).
report deadtime report deadtime
9.5.4 Setting the hysteresis
The height of the hysteresis band, “hysteresisBand”, is calculated according to 9.4.5 using the
percentage given by “hysteresis” with the minimum height given by “hysteresisMin”. The input
device shall support a hysteresis up to 25 %. A value of zero for “hysteresis” shall lead to
illuminance level events based on T only. The lowest value in the hysteresis band is
report
– 14 – IEC 62386-304:2017 © IEC 2017
given by “hysteresisBandLow”, and the highest value by “hysteresisBandHigh” – see 9.4.5. The
input device shall expose the following operations to set and observe the values of “hysteresis”
and “hysteresisMin”:
• “SET HYSTERESIS (DTR0)”, “QUERY HYSTERESIS” to set or query “hysteresis”.
“SET HYSTERESIS (DTR0)” shall set “hysteresis” depending on the “DTR0” value as follows:
• if “DTR0” > 25: no change;
• in all other cases: “DTR0”.
Since a hysteresis in percent would require a growing resolution in case the “inputValue” is
low, the minimum value for the hysteresis is physically limited. To avoid unwanted events at
low illumination levels, the minimum value for the hysteresis can also be set as an absolute
value “hysteresisMin”:
• “SET HYSTERESIS MIN (DTR0)”, “QUERY HYSTERESIS MIN” to set or query
“hysteresisMin”.
“SET HYSTERESIS MIN (DTR0)” shall set “hysteresisMin” to “DTR0”.
NOTE After power-up, “hysteresisBand” can be greater than (“hysteresisBandHigh”-“hysteresisBandLow”) until
“inputValue” is greater than or equal to “hysteresisMin”.
The default value for “hysteresisMin” shall depend on ‘resolution’ as defined in Table 4.
Table 4 – Default and reset values for “hysteresisMin”
“resolution” Factory default and reset value for “hysteresisMin”
1-6 0
7 1
8 2
9 5
10 10
11 20
12 40
13 81
14 163
>=15 255
NOTE The default value is approximately 1 %.
9.5.5 Manual configuration
If IEC 62386-333 is implemented, the instance level variables according to Table 5 may be
manually configured. QUERY MANUAL CONFIGURATION CAPABILITY 3xx (see
IEC 62386-333) shall return the byte as defined in Table 5:

Table 5 – “manualCapabilityInstance3xx” values
Bit Description Value
0 Manual configuration of “tReport” supported “1” = “Yes”
1 Manual configuration of “tDeadtime” supported “1” = “Yes”
2 Manual configuration of “hysteresis” supported “1” = “Yes”
3 Manual configuration of “hysteresisMin” supported “1” = “Yes”
4 Reserved “0”
5 Reserved “0”
6 Reserved “0”
7 Reserved “0”
9.6 Exception handling
9.6.1 Physical sensor failure
If a physical sensor failure is detected, the instance shall set “instanceError” to TRUE, from
the moment the failure is detected until the failure is resolved. While the error is detected, no
further events shall be sent.
9.6.2 Manufacturer specific errors
If a manufacturer specific error is detected, the instance shall set “instanceError” to TRUE,
from the moment the error occurs until the error is gone.
9.6.3 Error value
“instanceError” can be observed via “QUERY INSTANCE STATUS”.
While “instanceError” is set, “QUERY INSTANCE ERROR” shall return “instanceErrorByte”
according to Table 6:
Table 6 – “instanceErrorByte” values
Bit Description Value
0 Physical sensor failure? "1" = "Yes"
1 Reserved “0”
2 Reserved “0”
3 Reserved “0”
4 Manufacturer specific error 1? "1" = "Yes"
5 Manufacturer specific error 2? "1" = "Yes"
6 Manufacturer specific error 3? "1" = "Yes"
7 Manufacturer specific error 4? “1” = “Yes”

If used, the meaning of bits [7:4] of “instanceErrorByte” shall be documented in the
manual/documentation. The impact on event generation shall also be documented.
10 Declaration of variables
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, Clause 10
apply, with the following considerations.

– 16 – IEC 62386-304:2017 © IEC 2017
Table 7 shows additions to the device variables.
Table 7 – Declaration of device variables
Variable Default value Reset value Power on value Range of Memory type
(factory) validity
“extendedVersionNu 2.0 no change no change 00001000b ROM
mber”
Table 8 shows restrictions to the instance variables.
Table 8 – Restrictions to instance variables defined in IEC 62386-103:2014 and
IEC 62386-103:2014/AMD1:—
Variable Default value Reset value Power on value Range of Memory type
(factory) validity
“instanceType” 4 no change no change 4 ROM
a
“eventFilter” 1 1 no change 0000 000x NVM
“eventPriority” 4 4 no change [2,5] NVM
a
The value should reflect the actual situation as soon as possible.

NOTE “resolution”, “inputValue” and “eventPriority” are according to their respective definitions in
IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—.
Table 9 shows additions to the instance variables.
Table 9 – Declaration of instance variables
Variable Default value Reset value Power on Range of Memory type
(factory) value validity
a
b
“instanceErrorByte” no change 0 xxxx 0000b RAM
a
“hysteresisBand” no change 0 [0,max(“inputValue”)] RAM
a
“hysteresisBandHigh” no change 0 [“hysteresisBandLow”, RAM
max(“inputValue”)]
a
“hysteresisBandLow” no change 0 [0, RAM
“hysteresisBandHigh”]
“tReport” 30 30 no change [0,255] NVM
“tDeadtime” 30 30 no change [0,255] NVM
“hysteresisMin” See Table 4 See Table 4 no change [0,255] NVM
“hysteresis” 5 5 no change [0,25] NVM
a
Not applicable.
b
The value should reflect the actual situation as soon as possible.

11 Definition of commands
11.1 General
Unused opcodes shall be reserved for future needs.

11.2 Overview sheets
11.2.1 General
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.2 apply, with
the following additions.
11.2.2 Standard commands
Table 10 gives an overview of the additional commands and queries.
Table 10 – Standard commands
Command name Address Instance Opcode See Command
byte byte byte subclause subclause
SET REPORT TIMER (DTR0)  
Device Instance 0x30  9.5.1 11.8.3
SET HYSTERESIS (DTR0) Device Instance 0x31    9.5.4 11.8.4
SET DEADTIME TIMER (DTR0) Device Instance 0x32    9.5.2 11.8.5
SET HYSTERESIS MIN (DTR0) Device Instance 0x33    9.5.4 11.8.6

QUERY HYSTERESIS MIN Device Instance 0x3C   9.5.4 11.9.6
QUERY DEADTIME TIMER Device Instance 0x3D   9.5.2 11.9.2

QUERY REPORT TIMER Device Instance 0x3E   9.5.1 11.9.4
QUERY HYSTERESIS Device Instance 0x3F   9.5.4 11.9.5

11.3 Event messages
11.3.1 INPUT NOTIFICATION (device/instance, event)
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.3.1 apply,
with the following addition:
Refer to 9.4.1 for an overview of event values.
11.3.2 POWER NOTIFICATION (device)
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.3.2 apply.
11.4 Device control instructions
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.4 apply.
11.5 Device configuration instructions
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.5 apply.
11.6 Device queries
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.6 apply.
11.7 Instance control instructions
The requirements of IEC 62386-103:2014 and IEC 62386-103:2014/AMD1:—, 11.7 apply.
DTR0
DTR1
DTR2
Answer
Send
twice
– 18 – IEC 62386-304:2017 © IEC 2017
11.8 Instance configuration instructions
11.8.1 General
The requirements of
...