Appendix 6
United Kingdom
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
one bit with logic level 0;
transmitted with LSB first;
even parity
one 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:
Notes on Annex I C
Modifications
- C1
Annex 1C modified (21.8.2023) by The Drivers’ Hours and Tachographs (Amendment) Regulations 2023 (S.I. 2023/739), regs. 1(1), 3, Sch.