IEC 62386-202:2022

Digital addressable lighting interface - Part 202: Particular requirements for control gear - Self-contained emergency lighting (device type 1)

IEC 62386-202:2022 is applicable to control gear for control by digital signals of electronic lighting equipment which is associated with self-contained emergency lighting as described in IEC 61347-2-7 with additional control interface for configuring emergency operation.
This second edition cancels and replaces the first edition published in 2009. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
scope updated,
hardwired switch operation can be disabled,
installation inhibit feature added,
memory bank added,
modes of operation clarified, with some changes and additions,
command added to enter extended emergency mode,
command added to extend time in duration test mode.

Interface d'éclairage adressable numérique - Partie 202: Exigences particulières pour les appareillages de commande - Blocs autonomes d'éclairage de secours (dispositifs de type 1)

L'IEC 62386-202:2022 s'applique aux appareillages de commande pour la commande par des signaux numériques des appareils d'éclairage électronique associés aux blocs autonomes d'éclairage de secours décrits dans l'IEC 61347-2-7 équipés d'une interface de commande supplémentaire pour la configuration du fonctionnement de secours.
Cette deuxième édition annule et remplace la première édition parue en 2009. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
mise à jour du domaine d'application;
le fonctionnement du commutateur mécanique peut être désactivé;
ajout de la fonction de neutralisation de l'installation;
ajout du bloc de mémoire;
clarification des états de fonctionnement par des modifications et des ajouts;
ajout d'une commande pour passer à l'état de fonctionnement de secours prolongé;
ajout d'une commande pour prolonger la durée de l'état "Essai d'autonomie".

General Information

• Status: Published
• Publication Date: 14-Dec-2022
• ICS: 29.140.50 - Lighting installation systems
• ICS: 29.140.99 - Other standards related to lamps
• Technical Committee: TC 34 - Lighting
• Drafting Committee: WG 11 - TC 34/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 15-Dec-2022
• Completion Date: 13-Jan-2023

Relations

• Revises: IEC 62386-202:2009 - Digital addressable lighting interface - Part 202: Particular requirements for control gear - Self-contained emergency lighting (device type 1)
• Effective Date: 05-Sep-2023

Overview

IEC 62386-202:2022 is an international standard published by the International Electrotechnical Commission (IEC) that defines digital addressable lighting interface (DALI) requirements for control gear specifically used in self-contained emergency lighting systems (device type 1). As a part of the DALI family of standards, this document provides particular requirements for lighting control gear related to emergency lighting, enhancing safety and reliability through digital control interfaces.

This edition is a technical revision of the 2009 first edition and incorporates important updates including expanded scope, new features such as disabling hardwired switch operation, an installation inhibit feature, added memory banks, clarified modes of operation, and additional commands for extended emergency and duration test modes.

Key Topics

• Scope & Application
  IEC 62386-202:2022 applies to electronic control gear controlled by digital signals that operate self-contained emergency lighting equipment. It bridges the functional requirements described in IEC 61347-2-7 with additional control and configuration capabilities via a digital interface.

• Control Gear Functionality
  The standard outlines behavior for control gear in various modes: normal, inhibit, emergency, extended emergency, rest, function test, and duration test modes. This ensures consistent emergency light operation and integration into lighting control systems.

• Enhanced Command Set
  The revised edition introduces new commands allowing for remote entry into extended emergency mode and for extending the duration test period digitally. These enhance the flexibility of emergency system management.

• Installation Inhibit Feature
  A significant new addition that allows installers and system operators to inhibit operational modes during installation or maintenance, reducing false alarms and ensuring safe workflows.

• Memory Bank Inclusion
  Memory banks provide persistent data storage for emergency control gear information, enabling reliable configuration retention and diagnostic capabilities.

• Hardwired Switch and Emergency Input Management
  Designers can now disable hardwired switch functionality if necessary, and hardwired emergency inputs are managed in a defined manner ensuring safety compliance.

• Timing and Power Supply Requirements
  Detailed specifications concerning power supply interruptions, bus power management, and timing diagrams ensure robust operational reliability under emergency conditions.

Applications

IEC 62386-202:2022 is critical for manufacturers, system integrators, and facility managers involved in:

• Emergency Lighting Systems
  Ensuring reliable, compliant self-contained emergency lighting via digital controls in commercial buildings, hospitals, transport hubs, and industrial facilities.

• Smart Building Lighting Control
  Integration of emergency lighting control gear into digital building management systems (BMS) and lighting automation platforms using DALI protocols.

• Safety Compliance and Testing
  Automated function and duration testing features enable compliance with safety regulations and maintenance schedules with minimal manual intervention.

• Installation and Maintenance
  Installation inhibit functions and configurable operation modes facilitate safe and efficient emergency lighting system installation and servicing.

Related Standards

• IEC 61347-2-7 - Covers general requirements for control gear associated with self-contained emergency lighting; IEC 62386-202 extends these with digital control specifics.

• IEC 62386 Series - The wider DALI standard defining control gear requirements and communication protocols for digitally addressable lighting interfaces.

• IEC 60598-2-22 - Specifies requirements for emergency lighting luminaires, complementary to control gear standards.

• IEC 62034 - Focuses on the automatic test function of emergency lighting, ensuring standardized testing procedures.

Summary

IEC 62386-202:2022 sets the foundation for digital control of self-contained emergency lighting control gear, facilitating enhanced safety, flexible operation, and simplified maintenance. By adhering to this standard, manufacturers and users benefit from improved interoperability, enhanced control capabilities, and compliance with international safety regulations in emergency lighting applications.

---

Keywords: IEC 62386-202, digital addressable lighting interface, DALI, emergency lighting, control gear, self-contained emergency lighting, installation inhibit, emergency mode, lighting control standards, smart building lighting, IEC standard, emergency lighting control gear.

Standards Content (Sample)

IEC 62386-202 ®
Edition 2.0 2022-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface –
Part 202: Particular requirements for control gear – Self-contained emergency
lighting (device type 1)
Interface d'éclairage adressable numérique –
Partie 202: Exigences particulières pour les appareillages de commande –
Blocs autonomes d'éclairage de secours (dispositifs de type 1)

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IEC 62386-202 ®
Edition 2.0 2022-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface –

Part 202: Particular requirements for control gear – Self-contained emergency

lighting (device type 1)
Interface d'éclairage adressable numérique –

Partie 202: Exigences particulières pour les appareillages de commande –

Blocs autonomes d'éclairage de secours (dispositifs de type 1)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.50; 29.140.99 ISBN 978-2-8322-6212-2

– 2 – IEC 62386-202:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 General . 12
4.1 General . 12
4.2 Version number . 12
4.3 Power supply of bus units . 12
4.4 Power interruption at bus units . 13
4.4.1 General . 13
4.4.2 Power interruptions of external power supply . 13
4.4.3 Communication requirements in rest mode and emergency mode . 13
4.4.4 Endurance of REST MODE . 13
5 Electrical specification . 13
6 Interface power supply . 13
7 Transmission protocol structure . 13
8 Timing . 14
9 Method of operation . 14
9.1 General . 14
9.2 Command execution . 14
9.3 Non-controllable control gear . 14
9.3.1 General . 14
9.3.2 Command execution of non-controllable control gear . 14
9.3.3 Status bits of non-controllable control gear . 15
9.4 Emergency level . 15
9.4.1 General . 15
9.4.2 Emergency operation light output and emergency level . 15
9.4.3 Emergency physical maximum and minimum level . 15
9.4.4 Configuring emergency level . 16
9.4.5 Testing of emergency level . 16
9.5 Mode transition timing and behaviour . 16
9.6 System failure . 18
9.7 Modes of operation . 18
9.7.1 General . 18
9.7.2 Normal mode . 19
9.7.3 Inhibit mode . 20
9.7.4 Emergency mode . 21
9.7.5 Extended emergency mode. 22
9.7.6 Rest mode . 23
9.7.7 Mode 'Function test in progress' . 24
9.7.8 Mode 'Duration test in progress' . 25
9.7.9 Mode 'Battery cut-off' . 27
9.8 Emergency test functions and configuration . 27
9.8.1 General . 27
9.8.2 Automatic testing . 27

9.8.3 Automatic test execution status . 30
9.8.4 Querying test results . 31
9.8.5 Extended test duration . 31
9.8.6 Timing definitions . 32
9.9 Protection functionalities in emergency mode . 33
9.10 Emergency mode and operating modes . 33
9.11 Hardwired emergency inputs . 33
9.11.1 General . 33
9.11.2 Hardwired inhibit input . 33
9.11.3 Hardwired switch . 33
9.12 Control gear status and capabilities . 34
9.12.1 General . 34
9.12.2 Modification to "lampOn" . 34
9.12.3 Rated duration and battery charge . 34
9.12.4 Emergency status . 34
9.12.5 Emergency mode . 35
9.12.6 Emergency features . 36
9.12.7 Emergency failure status . 37
9.12.8 Hardwired switch status . 38
9.12.9 Emergency lamp operation time . 38
9.13 Restricting device type support . 39
9.14 Installation inhibit . 39
9.15 Memory banks . 39
9.15.1 General . 39
9.15.2 Accuracy of measurements . 39
9.15.3 Rounding of measurement values . 39
9.15.4 Refresh rate of memory bank values . 40
9.15.5 No overflow of counters . 40
9.15.6 Memory bank 208: Emergency control gear information . 40
10 Declaration of variables . 45
10.1 General . 45
10.2 Impact on control gear variables depending on control gear type . 45
10.3 Control gear variables for all self-contained control gear . 46
11 Definition of commands . 47
11.1 General . 47
11.2 Overview sheets . 47
11.3 Level instructions . 50
11.4 Configuration instructions . 50
11.4.1 General . 50
11.4.2 IDENTIFY DEVICE . 50
11.5 Queries . 50
11.5.1 General . 50
11.5.2 QUERY ACTUAL LEVEL. 50
11.6 Application extended commands . 50
11.6.1 General . 50
11.6.2 Configuration instructions . 51
11.6.3 Queries. 55
11.7 Special commands . 58
11.7.1 General . 58

– 4 – IEC 62386-202:2022 © IEC 2022
11.7.2 ENABLE DEVICE TYPE (data) . 58
Annex A (informative) Enabling or re-enabling installation inhibit . 59
A.1 General . 59
A.2 Re-enabling installation inhibit . 59
A.3 Modifying or cancelling installation inhibit operation . 59
Bibliography . 60

Figure 1 – IEC 62386 graphical overview . 7
Figure 2 – Modes and transitions . 19
Figure 3 – Timing diagram for function and duration tests . 28
Figure 4 – Duration test execution time out example . 31

Table 1 – Mode transition behaviour . 17
Table 2 – Bus power interruption behaviour . 18
Table 3 – Normal mode . 20
Table 4 – Inhibit mode . 21
Table 5 – Emergency mode . 22
Table 6 – Extended emergency mode . 23
Table 7 – Rest mode . 24
Table 8 – Mode 'Function test in progress' . 25
Table 9 – Mode 'Duration test in progress' . 26
Table 10 – Mode 'Battery cut-off' . 27
Table 11 – "extendedDuration" . 32
Table 12 – Timing definitions . 32
Table 13 – "emergencyStatus" . 35
Table 14 – "emergencyMode" . 36
Table 15 – "emergencyFeatures" . 36
Table 16 – "emergencyFailureStatus" . 37
Table 17 – "hardwiredSwitchStatus" . 38
Table 18 – Memory bank 208: Self-contained emergency control gear information . 40
Table 19 – Modifications of control gear variables . 45
Table 20 – Declaration of additional variables . 46
Table 21 – Application extended commands . 48
Table 22 – Perform DTR selected function . 55
Table 23 – Query selected variable . 56

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 202: Particular requirements for control gear –
Self-contained emergency lighting (device type 1)

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
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62386-202 has been prepared by IEC technical committee 34: Lighting. It is an International
Standard.
This second edition cancels and replaces the first edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) scope updated,
b) hardwired switch operation can be disabled,
c) installation inhibit feature added,
d) memory bank added,
e) modes of operation clarified, with some changes and additions,
f) command added to enter extended emergency mode,

– 6 – IEC 62386-202:2022 © IEC 2022
g) command added to extend time in duration test mode.
The text of this International Standard is based on the following documents:
Draft Report on voting
34/986/FDIS 34/1000/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
This Part 202 of IEC 62386 is intended to be used in conjunction with:
• Part 101, which contains general requirements for system components;
• Part 102, which contains general requirements for control gear.
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 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 document 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.

INTRODUCTION
IEC 62386 contains several parts, referred to as series. The IEC 62386 series specifies a bus
system for control by digital signals of electronic lighting equipment. The IEC 62386-1xx 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. Part 104 and Part 105
can be applied to control gear or control devices. Part 104 gives requirements for wireless and
alternative wired system components. Part 105 describes firmware transfer. Part 150 gives
requirements for an auxiliary power supply which can be stand-alone, or built into control gear
or control devices.
The IEC 62386-2xx series extends 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 IEC 62386-3xx series extends 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 second edition of IEC 62386-202 is intended to be used in conjunction with IEC 62386-101
and IEC 62386-102 and with the various parts that make up the IEC 62386-2xx series for control
gear, and can be used together with IEC 62386-103 and the various parts that make up the
IEC 62386-3xx series of particular requirements for control devices. The division 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 recognised.
The setup of the standards is graphically represented in Figure 1 below.

Figure 1 – IEC 62386 graphical overview
When this part of IEC 62386 refers to any of the clauses of the IEC 62386-1xx series, the extent
to which such a clause is applicable is specified. The other parts also include additional
requirements, as necessary.
All numbers used in this document are decimal numbers unless otherwise noted.

– 8 – IEC 62386-202:2022 © IEC 2022
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 and "x" in
binary numbers means "don't care". Where a variable is referred by a bit number, bit 0 is the
least significant bit.
The following typographic expressions are used:
Variables: variableName or variableName[3:0], giving only bits 3 to 0 of variableName;
Range of values: [lowest, highest];
Command: "COMMAND NAME".
DIGITAL ADDRESSABLE LIGHTING INTERFACE –

Part 202: Particular requirements for control gear –
Self-contained emergency lighting (device type 1)

1 Scope
This part of IEC 62386 is applicable to control gear for control by digital signals of electronic
lighting equipment which is associated with self-contained emergency lighting as described in
IEC 61347-2-7 with additional control interface for configuring emergency operation.
This document is only applicable to control gear complying with IEC 62386-102.
This document does not apply to centrally supplied emergency lighting control gear, which is
specified in IEC 62386-220.
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 62386-101:2022, Digital addressable lighting interface – Part 101: General requirements –
System components
IEC 62386-102:2022, Digital addressable lighting interface – Part 102: General requirements –
Control gear
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62386-101 and
IEC 62386-102 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
battery cut-off
mode of operation in which the normal supply is disconnected and the battery voltage is below
the battery cut-off voltage
Note 1 to entry: Reaching this point can trigger the device to protect against extensive discharge as defined in
IEC 61347-2-7:2011, 3.4 and IEC 61347-2-7:2011/AMD2:2021, 3.4.
3.2
battery cut-off voltage
battery voltage, below which the battery can no longer power the control gear or lamp(s)

– 10 – IEC 62386-202:2022 © IEC 2022
3.3
duration test
DT
mode of operation in which a test is performed to check the capability of the battery to supply
the control gear and lamp, within the limits of rated duration of emergency operation
[SOURCE: IEC 62034:2012, 3.7, modified – The definition has been revised to clarify that this
is a mode of operation.]
3.4
emergency level
value representing the light output for emergency lamp operation
Note 1 to entry: In some control gear, the emergency level is configurable.
3.5
emergency mode
mode of operation in which the normal supply has failed and the control gear powers the lamp
from the battery
[SOURCE: IEC 60598-2-22:2021, 22.3.17, modified – The definition has been revised to apply
to the control gear.]
3.6
emergency physical maximum level
level corresponding to the maximum light output the control gear can operate at when in
emergency mode
Note 1 to entry: The light level behaviour in normal mode is not affected by the emergency physical maximum level.
3.7
emergency physical minimum level
level corresponding to the minimum light output the control gear can operate at when in
emergency mode
Note 1 to entry: The light level behaviour in normal mode is not affected by the emergency physical minimum level.
3.8
extended emergency mode
mode of operation in which the normal supply is present, with the control gear operating the
lamp(s) at the emergency level and drawing power from either source
3.9
extended test duration
additional period of time for which the control gear operates the lamp during a duration test,
before indicating a pass result
3.10
function test
FT
mode of operation in which a test is performed to check the integrity of the circuit, change over
device, battery and function of the emergency lamp(s)
[SOURCE: IEC 62034:2012, 3.6, modified – The existing term "functional test" has been
replaced with "function test" and the definition has been revised to clarify that this is a mode of
operation.]
3.11
hardwired inhibit input
optional additional input of the control gear which prevents the control gear from going into the
emergency mode while activated
Note 1 to entry: The hardwired inhibit input is specified by the manufacturer. The state of the input can be "active"
or "inactive".
3.12
hardwired switch
optional additional input of type A, B and C control gear, that is used to switch the lamp on and
off in normal or inhibit modes
Note 1 to entry: The hardwired switch input is specified by the manufacturer. The state of the switch can be "ON"
or "OFF".
3.13
inhibit mode
mode of operation in which the control gear is powered from the normal supply but prevented
from switching to emergency mode in the event of normal supply failure
[SOURCE: IEC 60598-2-22:2021, 22.3.21, modified – The definition of "remote inhibiting mode"
has been modified to apply to the control gear.]
3.14
integral emergency control gear
lamp control gear which forms a non-replaceable part of an emergency luminaire and which
cannot be tested separately from the luminaire
[SOURCE: IEC 61347-1:2015, 3.1.3, modified – In the term "lamp controlgear" has been
replaced with "emergency control gear" and in the definition, "emergency" has been added.]
3.15
lamp cut-off voltage
battery voltage, below which the battery can no longer power the lamp(s), and which is higher
than the battery cut-off voltage
3.16
normal mode
mode of operation in which the normal supply is available and powers the control gear
3.17
normal supply
external supply used for normal operation of the control gear that explicitly excludes the self-
contained DC source
3.18
normal supply failure
condition in which the normal supply has failed
3.19
prolong time
time the extended emergency mode will last after restoration of normal supply, before switching
to normal mode
3.20
rest mode
mode in which the lamp is intentionally extinguished whilst the normal supply is not available

– 12 – IEC 62386-202:2022 © IEC 2022
[SOURCE: IEC 60598-2-22:2021, 22.3.18, modified – The definition has been revised to apply
to the control gear.]
3.21
type A control gear
maintained, dimming controllable self-contained emergency control gear with PHM (physical
minimum level) < 254 (100 %)
Note 1 to entry: If the normal supply is present, type A control gear acts like a standard dimmable device. Therefore,
type A control gear supports the execution of level instructions.
3.22
type B control gear
maintained, on/off controllable self-contained emergency control gear with PHM (physical
minimum level) equal to 254 (100 %)
Note 1 to entry: If the normal supply is present, type B control gear acts like a standard dimmable device with its
minimum level set to 254. Therefore, type B control gear supports the execution of level instructions.
3.23
type C control gear
maintained, non-controllable self-contained emergency control gear which operates the lamp(s)
in normal and inhibit modes, but does not support level instructions nor corresponding
configuration commands
Note 1 to entry: The lamp can still be controlled by a hardwired switch or separate interface.
[SOURCE: IEC 60598-2-22:2021, 22.3.5, modified – The term "maintained emergency
luminaire" has been replaced with "type C control gear"; the definition has been revised and the
note to entry has been added.]
3.24
type D control gear
non-maintained, non-controllable self-contained emergency control gear which does not
operate the lamp(s) in normal or inhibit modes, and does not support level instructions nor
corresponding configuration commands
Note 1 to entry: Type D control gear can have a switched live (SL) input that can control companion gear on a
"piggyback" type emergency control gear. For the purposes of this document this switched live input on type D control
gear is not considered a hardwired switch.
[SOURCE: IEC 60598-2-22:2021, 22.3.6, modified – The term "non-maintained emergency
luminaire" has been replaced with "type D control gear"; the definition has been revised and the
note to entry has been added.]
4 General
4.1 General
The requirements of IEC 62386-102:2022, Clause 4 apply, with the restrictions, changes and
additions identified below.
4.2 Version number
In 4.2 of IEC 62386-102:2022, "102" shall be replaced by "202", "version number" shall be
replaced by "extended version number", "versionNumber" shall be replaced by
"extendedVersionNumber" and "Table 16" shall be replaced by "Table 20".
4.3 Power supply of bus units
Control gear according to this document shall not be bus powered.

4.4 Power interruption at bus units
4.4.1 General
The requirements of IEC 62386-101:2022, 4.11 apply, with the following changes and additions.
4.4.2 Power interruptions of external power supply
Interruptions of the external power supply shall be defined as the period of time beginning with
failure of the normal supply and ending when the normal supply has been re-established within
the manufacturer-defined operating range. See IEC 62386-101:2022, 4.11.1.
For the case where the battery is connected and remains above the battery cut-off voltage, the
short interruption time as specified in IEC 62386-101:2022, 4.11.1 shall apply, otherwise the
short interruption time is modified to 2,5 cycles (AC supply) or 50 ms (DC supply).
4.4.3 Communication requirements in rest mode and emergency mode
During both rest and emergency modes, the control gear shall be capable of processing
commands received via the interface. These commands are limited as per 9.2.
NOTE 1 It is the responsibility of the manufacturer to show that in case power is drawn from the battery, the
additional amount of power required for communication during the rated emergency operation is considered when
determining the battery capacity.
NOTE 2 It is considered that those commands in 9.2 are limited to those required for managing emergency lighting.
4.4.4 Endurance of REST MODE
With a fully-charged battery, if rest mode is entered from inhibit mode, or from execution of
REST within 1 min of entering emergency mode, the power consumption whilst in rest mode
shall be sufficiently low such that rest mode continues for at least twice the rated duration time
without battery cut-off mode being entered.
It is recommended that the control gear and battery combination can operate in rest mode for
a time equal to the rated duration or longer, after being in emergency mode for the rated
duration or longer with "emergencyLevel" equal to "emergencyPhMaxLevel".
5 Electrical specification
The requirements of IEC 62386-102:2022, Clause 5 apply.
6 Interface power supply
The requirements of IEC 62386-102:2022, Clause 6 apply, with the following changes.
If a bus power supply is integrated, the maximum supply current specified in IEC 62386-
101:2022, 6.5.1, shall be no more than 242 mA.
NOTE This allows for the possibility of an additional bus power supply in the system, such that the bus can still be
powered even when the normal supply fails, allowing bus communications whilst in emergency mode or rest mode.
7 Transmission protocol structure
The requirements of IEC 62386-102:2022, Clause 7 apply.

– 14 – IEC 62386-202:2022 © IEC 2022
8 Timing
The requirements of IEC 62386-102:2022, Clause 8 apply.
9 Method of operation
9.1 General
The requirements of IEC 62386-102:2022, Clause 9 apply, with the following restrictions,
changes and additions. These restrictions, changes and additions apply to all types (A, B, C
and D), unless specified otherwise.
9.2 Command execution
To ensure compliance with emergency lighting requirements, it is sometimes necessary for self-
contained emergency control gear to deviate from the behaviour specified in IEC 62386-102.
Whilst in any of the following modes:
• emergency mode,
• REST mode,
the following restrictions shall apply:
– The control gear shall discard all instructions, all special commands and all application
extended instructions, including those defined in this document, those defined in IEC 62386-
102, and those defined in other parts of the IEC 62386-2xx series, with the following
exceptions (see IEC 62386-102:2022, 9.7):
• "DTR0(data)", "DTR1(data)", "DTR2(data)";
• "READ MEMORY LOCATION (DTR1, DTR0)";
• "ENABLE DEVICE TYPE (data)";
• any command marked in Table 21 as 'Executed in mode' for the current mode.
– The control gear shall continue to process query commands. The contents of their answers
shall be adapted according to 10.2.
– The control gear is not required to provide reliable responses to queries of other parts of
the IEC 62386-2xx series related to light output.
NOTE The above requirements imply that as long as one of the mentioned modes of operation is active, only
commands according to this document are executed where applicable. This also applies for all parts of the
IEC 62386-2xx series.
Where applicable, these requirements apply in addition to the restrictions given in 9.3.2.
9.3 Non-controllable control gear
9.3.1 General
Types C and D control gear are non-controllable and are not intended to be used for standard
lighting purposes. Therefore, their interface serves purely for setting and querying emergency
operation related variables and functionality. Light output in normal mode cannot be affected
via the interface. The light output in normal mode of a type C control gear can be affected by
the state of a hardwired input.
9.3.2 Command execution of non-controllable control gear
Types C and D control gear shall discard all commands descr
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