Document ID: chunk:federal_register_of_legislation:F2025C00113:reg:4:p7
Version: federal_register_of_legislation:F2025C00113
Segment Type: reg
Provision Reference: reg 4 (pt 7/10)
Character Range: 88728–91961

or
            2.             The supply voltage to the trailer falls below a value nominated by the manufacturer at which the prescribed requirements for any of the braking functions required by clause 7.2 of this standard can no longer be met.
            1.                            Each category TD trailer other than a 'Converter Dolly', which is equipped with a 'Vehicle Stability Function', must also connect contact 5 of the applicable electrical connector to -ve (e.g. contact 3 or contact 4), if/when its 'Vehicle Stability Function' is disabled in operation above 20 km/h, by a means satisfying clause 2.3.1 of APPENDIX 3.
            2.                            The power supply transmitted through an ISO 7638 connector must be used exclusively for braking and running gear functions and that required for the transfer of trailer related information not transmitted via an electric 'Control Line'.
                1.                     However, in all cases, whenever power transmitted through an ISO 7638 connector is used for the functions defined in this clause above, the braking system must have priority and be protected from an overload external to the braking system. This protection must be a function of the braking system.
                2.                     The power supply for all other functions must use other measures.

 1.                                  Electric 'Control Line' requirements
     1.                            In the case of a trailer equipped with an electric 'Control Line':
            1.             The communications via the electric 'Control Line' must conform to ISO 11992‑1:2003 and ISO 11992‑2:2003 including its amendment 1:2007.[3]
            2.             The electric 'Control Line' must be a point-to-point type using a seven pin (or tube) connector in accordance with ISO 7638‑1:2003 or ISO 7638‑2:2003; as per which, contact 6 must be wired for the CAN_H signal and contact 7 must be wired for the CAN_L signal.
            1.                     The electric 'Control Line' must meet the requirements of ISO 11992‑1:2003 including:
            1.             The wiring must be an unshielded twisted pair; and
            2.             The maximum cable length of the electric 'Control Line' within the trailer must not exceed 18 m and the bus capacitance of the cable must not exceed 2.9 nF, except where otherwise permitted by clause 2.3 of this appendix below.
            1.                     The message "illuminate stop lamps" must be transmitted by the trailer via the electric 'Control Line' when the trailer 'Service Brake System' is activated during 'Automatically Commanded Braking' initiated by the trailer.  However, the signal may be suppressed, when the retardation generated is less than 0.7 m/s2.
            2.                     The message "illuminate stop lamps" must not be transmitted by the trailer via the electric 'Control Line' during 'Selective Braking' initiated by the trailer (note: during a 'Selective Braking' event, the function may change to 'Automatically Commanded Braking').
 1.                            The data contacts of an ISO 7638 connector incorporating an electric 'Control Line' must be used to transfer