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) (c. 799)

ANNEX I C U.K. Requirements for construction, testing, installation, and inspection

Appendix 8

CALIBRATION PROTOCOL U.K.

4. COMMUNICATION SERVICES U.K.

4.2. StopCommunication Service U.K.

4.2.1 Message description U.K.

The purpose of this communication layer service is to terminate a communication session.

CPR_020 Upon receiving a StopCommunication indication primitive, the VU shall check if the current conditions allow to terminate this communication. In this case the VU shall perform all actions necessary to terminate this communication. U.K.

CPR_021 If it is possible to terminate the communication, the VU shall issue a StopCommunication response primitive with the Positive Response parameters selected, before the communication is terminated. U.K.

CPR_022 If the communication cannot be terminated by any reason, the VU shall issue a StopCommunication response primitive with the Negative Response parameter selected. U.K.

CPR_023 If time-out of P3 max is detected by the VU, the communication shall be terminated without any response primitive being issued. U.K.

4.2.2 Message format U.K.

CPR_024 The message formats for the StopCommunication primitives are detailed in the following tables. U.K.

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

4.2.3 Parameter Definition U.K.

This service does not require any parameter definition.