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Commission Implementing Regulation (EU) 2016/799Show full title
Commission Implementing Regulation (EU) 2016/799 of 18 March 2016 implementing Regulation (EU) No 165/2014 of the European Parliament and of the Council laying down the requirements for the construction, testing, installation, operation and repair of tachographs and their components (Text with EEA relevance)
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Revised version PDFs
- Revised 26/02/202011.25 MB
- Revised 17/04/201810.62 MB
- Revised 26/05/20169.89 MB
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Changes over time for: Division 2.2.1
Alternative versions:
- 01/01/1957- Amendment
- 31/01/2020
Point in time - Exit day: start of implementation period31/01/2020 11pm- Amendment
- 31/01/2020
Point in time - End of implementation period31/12/2020- Amendment
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Point in time view as at 31/01/2020.
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There are outstanding changes not yet made to Commission Implementing Regulation (EU) 2016/799. Any changes that have already been made to the legislation appear in the content and are referenced with annotations.
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2.2.1 Message structure U.K.
DDP_002All the messages exchanged between the IDE and the VU are formatted with a structure consisting of three parts:U.K.
Header composed by a Format byte (FMT), a Target byte (TGT), a Source byte (SRC) and possibly a Length byte (LEN),
Data field composed by a Service Identifier byte (SID) and a variable number of data bytes, which can include an optional diagnostic session byte (DS_) or an optional transfer parameter byte (TRTP or TREP).
Checksum composed by a Checksum byte (CS).
| Header | Data field | Checksum | |||||||
|---|---|---|---|---|---|---|---|---|---|
| FMT | TGT | SRC | LEN | SID | DATA | … | … | … | CS |
| 4 bytes | Max 255 bytes | 1 byte | |||||||
The TGT and SRC byte represent the physical address of the recipient and originator of the message. Values are F0 Hex for the IDE and EE Hex for the VU.
The LEN byte is the length of the Data field part.
The Checksum byte is the 8 bit sum series modulo 256 of all the bytes of the message excluding the CS itself.
FMT, SID, DS_, TRTP and TREP bytes are defined later in this document.
DDP_003In the case where the data to be carried by the message is longer than the space available in the data field part, the message is actually sent in several sub messages. Each sub message bears a header, the same SID, TREP and a 2-byte sub message counter indicating the sub message number within the total message. To enable error checking and abort the IDE acknowledges every sub message. The IDE can accept the sub message, ask for it to be re-transmitted, request the VU to start again or abort the transmission.U.K.
DDP_004If the last sub message contains exactly 255 bytes in the data field, a final sub message with an empty (except SID TREP and sub message counter) data field must be appended to show the end of the message.U.K.
Example:
| Header | SID | TREP | Message | CS |
|---|---|---|---|---|
| 4 Bytes | Longer than 255 Bytes | |||
Will be transmitted as:
| Header | SID | TREP | 00 | 01 | Sub message 1 | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | 255 Bytes | |||||
| Header | SID | TREP | 00 | 02 | Sub message 2 | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | 255 Bytes | |||||
…
| Header | SID | TREP | xx | yy | Sub message n | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | Less than 255 Bytes | |||||
or as:
| Header | SID | TREP | 00 | 01 | Sub message 1 | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | 255 Bytes | |||||
| Header | SID | TREP | 00 | 02 | Sub message 2 | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | 255 Bytes | |||||
…
| Header | SID | TREP | xx | yy | Sub message n | CS |
|---|---|---|---|---|---|---|
| 4 Bytes | 255 Bytes | |||||
| Header | SID | TREP | xx | yy + 1 | CS |
|---|---|---|---|---|---|
| 4 Bytes | 4 bytes | ||||
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