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- Gwreiddiol (Fel y’i mabwysiadwyd gan yr UE)
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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Some services are necessary to establish and maintain communication. They do not appear on the application layer. The services available are detailed in the following table:
Communication Services
Service name | Description |
---|---|
StartCommunication | The client requests to start a communication session with a server(s). |
StopCommunication | The client requests to stop the current communication session. |
TesterPresent | The client indicates to the server that it is still present. |
There is a bus-idle time prior to any activity.
The tester then sends an initialisation pattern.
All information which is necessary to establish communication is contained in the response of the VU.
All communication parameters are set to values defined in Table 4 according to the key bytes.
The VU is waiting for the first request of the tester.
The VU is in the default diagnostic mode, i.e. StandardDiagnosticSession.
The calibration I/O signal line is in the default state, i.e. disabled state.
First transmission after power on, Tidle = 300 ms.
After completion of a StopCommunication Service, Tidle = P3 min.
After stopping communication by time-out P3 max, Tidle = 0.
Table 3 | |||
Timing values for fast initialisation | |||
Parameter | min value | max value | |
---|---|---|---|
Tinil | 25 ± 1 ms | 24 ms | 26 ms |
Twup | 50 ± 1 ms | 49 ms | 51 ms |
Table 4 | |||
Communication timing values | |||
Timing Parameter | Parameter Description | lower limit values [ms] | upper limit values [ms] |
---|---|---|---|
min. | max. | ||
P1 | Inter byte time for VU response | 0 | 20 |
P2 | Time between tester request and VU response or two VU responses | 25 | 250 |
P3 | Time between end of VU responses and start of new tester request | 55 | 5 000 |
P4 | Inter byte time for tester request | 5 | 20 |
Table 5 | |||
StartCommunication Request Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 81 | FMT |
#2 | Target address byte | EE | TGT |
#3 | Source address byte | tt | SRC |
#4 | StartCommunication Request Service Id | 81 | SCR |
#5 | Checksum | 00-FF | CS |
Table 6 | |||
StartCommunication Positive Response Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | tt | TGT |
#3 | Source address byte | EE | SRC |
#4 | Additional length byte | 03 | LEN |
#5 | StartCommunication Positive Response Service Id | C1 | SCRPR |
#6 | Key byte 1 | EA | KB1 |
#7 | Key byte 2 | 8F | KB2 |
#8 | Checksum | 00-FF | CS |
The purpose of this communication layer service is to terminate a communication session.
Table 7 | |||
StopCommunication Request Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | EE | TGT |
#3 | Source address byte | tt | SRC |
#4 | Additional length byte | 01 | LEN |
#5 | StopCommunication Request Service Id | 82 | SPR |
#6 | Checksum | 00-FF | CS |
Table 8 | |||
StopCommunication Positive Response Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | tt | TGT |
#3 | Source address byte | EE | SRC |
#4 | Additional length byte | 01 | LEN |
#5 | StopCommunication Positive Response Service Id | C2 | SPRPR |
#6 | Checksum | 00-FF | CS |
Table 9 | |||
StopCommunication Negative Response Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | tt | TGT |
#3 | Source address byte | EE | SRC |
#4 | Additional length byte | 03 | LEN |
#5 | negative Response Service Id | 7F | NR |
#6 | StopCommunication Request Service Identification | 82 | SPR |
#7 | responseCode = generalReject | 10 | RC_GR |
#8 | Checksum | 00-FF | CS |
This service does not require any parameter definition.
The TesterPresent service is used by the tester to indicate to the server that it is still present, in order to prevent the server from automatically returning to normal operation and possibly stopping the communication. This service, sent periodically, keeps the diagnostic session/communication active by resetting the P3 timer each time a request for this service is received.
Table 10 | ||||
TesterPresent Request Message | ||||
Byte # | Parameter Name | Hex Value | Mnemonic | |
---|---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT | |
#2 | Target address byte | EE | TGT | |
#3 | Source address byte | tt | SRC | |
#4 | Additional length byte | 02 | LEN | |
#5 | TesterPresent Request Service Id | 3E | TP | |
#6 | Sub Function = responseRequired = | [ yes | 01 | RESPREQ_Y |
no ] | 02 | RESPREQ_NO | ||
#7 | Checksum | 00-FF | CS |
Table 11 | |||
TesterPresent Positive Response Message | |||
Byte # | Parameter Name | Hex Value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | tt | TGT |
#3 | Source address byte | EE | SRC |
#4 | Additional length byte | 01 | LEN |
#5 | TesterPresent Positive Response Service Id | 7E | TPPR |
#6 | Checksum | 00-FF | CS |
Table 12 | ||||
TesterPresent Negative Response Message | ||||
Byte # | Parameter Name | Hex Value | Mnemonic | |
---|---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT | |
#2 | Target address byte | tt | TGT | |
#3 | Source address byte | EE | SRC | |
#4 | Additional length byte | 03 | LEN | |
#5 | negative Response Service Id | 7F | NR | |
#6 | TesterPresent Request Service Identification | 3E | TP | |
#7 | responseCode = | [SubFunctionNotSupported-InvalidFormat | 12 | RC_SFNS_IF |
incorrectMessageLength] | 13 | RC_IML | ||
#8 | Checksum | 00-FF | CS |
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