IEC 62386-105:2020 pdf download

IEC 62386-105:2020 pdf download.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 3.1 firmware FW 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.
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.