Digital addressable lighting interface - Part 105: Particular requirements for control gear and control devices - Firmware Transfer

IEC 62386-105:2020 applies to control gear and control devices.
Typically, a bus unit according to IEC 62386 (all parts) contains firmware. There are circumstances where it might be necessary to change the firmware after production or shipping of the product. For example if the bus unit does not operate as intended. In such a case, a firmware update of a bus unit via the interface is beneficial.
This firmware update process is primarily designed to be a bug fix process, not a feature extension process. Nevertheless the firmware update process can be used for feature extensions. But it is important that the risk of negative effects to the complete system is considered in detail.

Interface d'éclairage adressable numérique - Partie 105: Exigences particulières pour appareillages et dispositifs de commande - Transfert du microprogramme

L’IEC 62386-105:2020 s’applique aux appareillages et dispositifs de commande.
Un appareillage de bus conforme à l'IEC 62386 (toutes les parties) contient généralement un microprogramme. Il peut être nécessaire dans certaines circonstances de modifier ce microprogramme après la production ou l’expédition du produit, par exemple lorsque l’appareillage de bus ne fonctionne pas comme prévu. Dans ce cas, il est bénéfique de mettre à jour le microprogramme de l’appareillage de bus par l’intermédiaire de l’interface.
Ce processus de mise à jour du microprogramme est principalement conçu comme un processus de correction des bogues et non comme un processus d'extension de caractéristiques. Le processus de mise à jour du microprogramme peut néanmoins être utilisé pour l’extension des caractéristiques. Il est important cependant d'étudier en détail le risque d’effets négatifs sur le système entier.

General Information

Status
Published
Publication Date
25-Mar-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
26-Mar-2020
Ref Project

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IEC 62386-105
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface –
Part 105: Particular requirements for control gear and control devices –
Firmware transfer
Interface d’éclairage adressable numérique –
Partie 105: Exigences particulières pour appareillages et dispositifs de
commande – Transfert du microprogramme
IEC 62386-105:2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62386-105
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital addressable lighting interface – –
Part 105: Particular requirements for control gear and control devices –
Firmware transfer
Interface d’éclairage adressable numérique – –
Partie 105: Exigences particulières pour appareillages et dispositifs de
commande – Transfert du microprogramme
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.50; 29.140.99 ISBN 978-2-8322-8020-1

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62386-105:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 General ........................................................................................................................... 8

4.1 General ................................................................................................................... 8

4.2 Transmitters and receivers in bus units ................................................................... 8

4.3 Logical units in a bus unit ....................................................................................... 8

5 Electrical specification ..................................................................................................... 8

6 Interface power supply .................................................................................................... 8

7 Transmission protocol structure ....................................................................................... 8

7.1 General ................................................................................................................... 8

7.2 32 bit forward frame encoding ................................................................................. 9

8 Timing ............................................................................................................................. 9

9 Method of operation ......................................................................................................... 9

9.1 General ................................................................................................................... 9

9.2 Data transmission ................................................................................................... 9

9.3 Duration .................................................................................................................. 9

9.4 Security ................................................................................................................ 10

9.5 Firmware update features ..................................................................................... 10

9.6 Update process ..................................................................................................... 10

9.6.1 Start firmware update .................................................................................... 10

9.6.2 Data transfer ................................................................................................. 10

9.6.3 Persistent variables during firmware update .................................................. 12

9.6.4 Firmware version number .............................................................................. 13

9.6.5 Firmware update in a system ......................................................................... 13

9.6.6 Error recovery................................................................................................ 13

10 Declaration of variables ................................................................................................. 13

11 Definition of commands ................................................................................................. 14

11.1 General ................................................................................................................. 14

11.2 Overview sheets ................................................................................................... 14

11.3 Commands ........................................................................................................... 16

11.3.1 General ......................................................................................................... 16

11.3.2 Standard commands ...................................................................................... 16

11.3.3 Data transfer commands ................................................................................ 17

Annex A (normative) Update file description ........................................................................ 19

Annex B (normative) CRC16 Calculation .............................................................................. 20

Annex C (informative) Firmware update process example .................................................... 21

Annex D (informative) Firmware update management check sheet ....................................... 23

Figure 1 – IEC 62386 graphical overview ................................................................................ 6

Figure C.1 – Example of a firmware update process ............................................................. 21

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IEC 62386-105:2020 © IEC 2020 – 3 –

Table 1 – 32-bit command frame encoding .............................................................................. 9

Table 2 – Firmware update features ...................................................................................... 10

Table 3 – Block 0 definitions ................................................................................................. 11

Table 4 – Block 1..n definitions ............................................................................................. 12

Table 5 – Declaration of additional variables ......................................................................... 14

Table 6 – Standard commands for bus units with firmware update capability ......................... 15

Table 7 – Data transfer commands for bus units with firmware update capability .................. 15

---------------------- Page: 5 ----------------------
– 4 – IEC 62386-105:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL ADDRESSABLE LIGHTING INTERFACE –
Part 105: Particular requirements for control gear and control devices –
Firmware transfer
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of the 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,

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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

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62386-105 has been prepared by IEC technical committee 34:

Lamps and related equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
34/675/FDIS 34/688/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.

---------------------- Page: 6 ----------------------
IEC 62386-105:2020 © IEC 2020 – 5 –
This Part 105 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 the relevant product type (control gear),

and with the appropriate Parts 2xx (particular requirements for control gear);

• Part 103, which contains general requirements for the relevant product type (control

devices), and the appropriate Parts 3xx (particular 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 62386-105:2020 © IEC 2020
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.

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 first edition of IEC 62386-105 is intended to be used in conjunction with IEC 62386-101,

IEC 62386-102 and the various parts that make up the IEC 62386-2xx series for control gear,

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 recognized.
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 and the order in which the tests are to be

performed are specified. The other parts also include additional requirements, as necessary.

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

Range of values: [lowest, highest]
Command: “COMMAND NAME”
---------------------- Page: 8 ----------------------
IEC 62386-105:2020 © IEC 2020 – 7 –
DIGITAL ADDRESSABLE LIGHTING INTERFACE –
Part 105: Particular requirements for control gear and control devices –
Firmware transfer
1 Scope
This part of IEC 62386 applies to control gear and control devices.

Typically, a bus unit according to IEC 62386 (all parts) contains firmware. There are

circumstances where it might be necessary to change the firmware after production or

shipping of the product. For example if the bus unit does not operate as intended. In such a

case, a firmware update of a bus unit via the interface is beneficial.

This firmware update process is primarily designed to be a bug fix process, not a feature

extension process. Nevertheless the firmware update process can be used for feature

extensions. But it is important that the risk of negative effects to the complete system is

considered in detail.

NOTE Annex D provides a “Firmware update management check sheet” to support risk estimation.

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/AMD1:2018

IEC 62386-102:2014, Digital addressable lighting interface – Part 102: General requirements

– Control gear
IEC 62386-102:2014/AMD1:2018

IEC 62386-103:2014, Digital addressable lighting interface – Part 103: General requirements

– Control devices
IEC 62386-103:2014/AMD1:2018
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62386-101,

IEC 62386-102 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
---------------------- Page: 9 ----------------------
– 8 – IEC 62386-105:2020 © IEC 2020
3.1
firmware

software programmed into a control gear or control device, which can be changed during an

update
Note 1 to entry: This note applies to the French language only.
3.2
CRC
cyclic redundancy check
checksum used to prevent data corruption
Note 1 to entry: Annex B provides detailed information about CRC calculation.
4 General
4.1 General

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018 apply, with

the restrictions, changes and additions identified below.

NOTE Systems with a single-master application controller are unlikely to operate correctly when other master

control devices, such as upgrade tools, are connected.
4.2 Transmitters and receivers in bus units

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018, 4.6.1 shall

be extended as follows.

Bus units supporting firmware transfer shall be additionally capable of receiving 32 bit forward

frames as specified in IEC 62386-101:2014, 7.4.3 (Reserved forward frame).
4.3 Logical units in a bus unit

If the firmware update process is started on a bus unit, all logical units inside the bus unit

shall be affected. All variables defined in Table 5 shall be shared by all logical units of the bus

unit.
5 Electrical specification

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018, Clause 5

apply.
6 Interface power supply

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018, Clause 6

apply.
7 Transmission protocol structure
7.1 General

The requirements of IEC 62386-101:2014, Clause 7 apply, with the following additions.

---------------------- Page: 10 ----------------------
IEC 62386-105:2020 © IEC 2020 – 9 –
7.2 32 bit forward frame encoding

The forward frame format used for firmware update consists of n = 32 data bits as described

in IEC 62386-101:2014, 7.4.3 (Reserved forward frame).
The 32 bit forward frame for 32 bit frames shall be encoded as shown in Table 1.
Table 1 – 32-bit command frame encoding
Bytes/Bits
Opcode byte
Device addressing
Address byte
method
1 2 3
31 30 29 28 27 26 25 24 23…16 15…8 7…0
0 64 short addresses x Short addressing
1 1 1 1 1 1 0 x Broadcast unaddressed
1 1 1 1 1 1 1 x Broadcast
All other address byte values. Reserved

For bit 24, 0 indicates address space for control gear, 1 indicates address space for control

devices.
8 Timing

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018, Clause 8

apply.
9 Method of operation
9.1 General

The requirements of IEC 62386-101:2014 and IEC 62386-101:2014/AMD1:2018, 9.8 (Dealing

with frames and commands), 9.2 (Transactions) with the exception that the total duration may

exceed 400 ms, 9.4 (Command iteration) and 9.6 (Use of multiple bus power supplies) apply.

9.2 Data transmission

A bus unit receives a new FW block by block. The first block (block 0) contains information

about the type of bus unit (see Table 3), which receives a new FW. This avoids transferring

the wrong FW to a bus unit if more than one bus unit is updated at a time.
NOTE Annex A provides detailed information about the update file.

The opcode byte 1 shall be 0xFB for 32-bit standard commands (see Table 6). If the opcode

byte 1 in a standard command is not equal to 0xFB, the bus unit shall not accept the standard

command.
9.3 Duration

A data transmission frame consists of a start bit, 32 data bits and a stop condition, which

occupies the bus for around 30 ms. With a settling time of less than 15 ms (maximum frame

priority) the transmission of three bytes takes less than 45 ms. For an update of 64 kByte it is

expected to take less than 20 min.
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– 10 – IEC 62386-105:2020 © IEC 2020
9.4 Security

It is recommended that the individual manufacturer ensures firmware image integrity and

authenticity. This document specifies the use of CRC checksums to help ensure error-free

transfer of data.
9.5 Firmware update features

Each bus unit shall expose its firmware update features as a combination of device properties

as given in Table 2.
Table 2 – Firmware update features
Bit Description Value See
0 “fwUpdateCancelSupported” is TRUE? "1" = "YES" XXX
1-7 Reserved – not implemented "0" = "NO"
The bus unit firmware update features can be queried using
QUERY FW UPDATE FEATURES.

If the bus unit supports cancellation of the firmware update process (see 9.6.2.3),

“fwUpdateCancelSupported” is set to TRUE.
9.6 Update process
9.6.1 Start firmware update

A bus unit shall enable the firmware update process by the acceptance of the command

START FW TRANSFER. Several bus units can be addressed in this way to update more than

one bus unit at a time.
NOTE 1 Annex C provides an example of the firmware update process.

It is recommended not to trigger erasing of the memory before block 0 is verified.

Whilst “fwUpdateProcessEnabled” is TRUE, the operation of the bus unit is manufacturer-

specific except for the requirements given in this document.

NOTE 2 This includes, for example, the reaction to commands of other parts of the IEC 62386 series.

9.6.2 Data transfer
9.6.2.1 Block 0 (information block)

Block 0 contains all data for the bus unit to decide if it will accept the new firmware or not.

The GTIN number, the hardware version number and the firmware version number contained

in the bus unit are described in IEC 62386-102:2014 and IEC 62386-102:2014/AMD1:2018,

9.10.6 (Memory bank 0 for control gear) and IEC 62386-103:2014 and IEC 62386-

103:2014/AMD1:2018, 9.10.6 (Memory bank 0 for control devices). A bus unit shall have a

maximum of one family GTIN which shall be shown in the documentation of the bus unit.

Upon reception of a complete block 0, the following information is checked, where Table 3

shows block 0 content:
• The received block 0 “Size of block” is equal to the value shown in Table 3.
• The received block 0 “Block 0 version” is equal to the value shown in Table 3.
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IEC 62386-105:2020 © IEC 2020 – 11 –
• The received block 0 “GTIN” matches the GTIN stored in memory bank 0.

• (Received block 0 “FW version min”) ≤ (memory bank 0, Firmware version) ≤ (received

block 0 “FW version max”).

• (Received block 0 “HW version min”) ≤ (memory bank 0, Hardware version) ≤ (received

block 0 “HW version max”).

• (Received block 0 “Identification number min”) ≤ (memory bank 0, Identification number) ≤

(received block 0 “Identification number max”).
• The received block 0 “Device key” meets manufacturer-specific requirements.

• The received block 0 “CRC” matches the calculated value based on the block 0 content

(see Annex B).
If the above check is successful, the following operation shall result:
• “sessionKey” shall be set to the received block 0 “Session key”,
• “currentBlock” shall be set to 1,
• “currentBlockByte” shall be set to 0,
• previously received block data that is unwritten, may be discarded.
Otherwise, the following operation shall result:

• “fwUpdateProcessEnabled” shall be set to FALSE and resume normal operation if possible.

Table 3 – Block 0 definitions
Address (hex) Size (bytes) Description
00 1 Size of block (fixed value of 0x3D for block 0)
01 1 Block 0 version (always 0x00)
02..04 3 Total block count (MSB first)
05..0A 6 GTIN (MSB first)
0B..0C 2 HW version min (MSB first)
0D..0E 2
...

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