# 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), Appendix 6

Extent: E+W+S+N.I.

FRONT CONNECTOR FOR CALIBRATION AND DOWNLOAD
1.
HARDWARE
1.1.
Connector
INT_001
The downloading/calibration connector shall be a 6 pin connector, accessible on the front panel without the need to disconnect any part of the tachograph, and shall comply with the following drawing (all dimensions in millimetres):
The following diagram shows a typical 6 pin mating plug:
1.2.
Contact allocation
INT_002
Contacts shall be allocated in accordance with the following table:
Pin
Description
Remark
1
Battery minus
Connected to the battery minus of the vehicle
2
Data communication
K-line (ISO 14230-1)
3
RxD — Downloading
Data input to tachograph
4
Input/output signal
Calibration
5
Permanent power output
The voltage range is specified to be that of the vehicle power minus 3V to allow for the voltage drop across the protective circuitry
Output 40 mA
6
TxD — Downloading
Data output from tachograph
1.3.
Block diagram
INT_003
The block diagram shall comply with the following:
2.
DOWNLOADING INTERFACE
INT_004
The downloading interface shall comply to RS232 specifications.
INT_005
The downloading interface shall use one start bit, 8 data bits LSB first, one even parity bit and 1 stop bit.
Data byte organisation
Start bitone bit with logic level 0;
Data bitstransmitted with LSB first;
Parity biteven parity
Stop bitone bit with logic level 1
When numerical data composed by more than one byte are transmitted, the most significant byte is transmitted first and the least significant byte last.
INT_006
Transmission baud rates shall be adjustable from 9 600 bps to 115 200 bps. Transmission shall be achieved at the highest possible transmission speed, the initial baud rate after a start of communication being set at 9 600 bps.
3.
CALIBRATION INTERFACE
INT_007
The data communication shall comply to ISO 14230-1 Road vehicles — Diagnostic systems — Keyword protocol 2000 — Part 1: Physical layer, First edition: 1999.
INT_008
The input/output signal shall comply with the following electrical specification:
Parameter
Minimum
Typical
Maximum
Remark
U low (in)
1,0 V
I = 750 μA
U high (in)
4 V
I = 200 μA
Frequency
4 kHz
U low (out)
1,0 V
I = 1 mA
U high (out)
4 V
I = 1 mA
INT_009
The input/output signal shall comply with the following timing diagrams:

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Source: https://www.legislation.gov.uk/eur/2016/799/annex/1/appendix/6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2016-799/annex-1/appendix-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.