OpenLegislation

Appendix 6 EXTERNAL INTERFACESF1F2

United Kingdom

Original text. Later amendments are not shown.

1.

HARDWARE

1.1.

Connector

INT_001 The downloading/calibration connector shall be a six pin connector, accessible on the front panel without the need to disconnect any part of the recording equipment, and shall comply with the following drawing (all dimensions in millimetres):

The following diagram shows a typical six 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 14 230-1)
3 RxD — Downloading Data input to recording equipment
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 recording equipment

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.

Start bit

  • one bit with logic level 0

    • Data bits

  • transmitted with LSB first

    • Parity bit

  • even parity

    • Stop bit

  • 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 14 230-1 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 (in) 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:

    Sensor signal (out)

    Test signal (in)

    UTC clock signal (out)

    Annotations

    Textual amendments

    F1

    Inserted by Council Regulation (EC) No 2135/98 of 24 September 1998 amending Regulation (EEC) No 3821/85 on recording equipment in road transport and Directive 88/599/EEC concerning the application of Regulations (EEC) No 3820/85 and (EEC) No 3821/85.

    F2

    Substituted by Commission Regulation (EC) No 1360/2002 of 13 June 2002 adapting for the seventh time to technical progress Council Regulation (EEC) No 3821/85 on recording equipment in road transport (Text with EEA relevance).