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Clause 6.6.1 Each data communication link (DCL) shall be tested to confirm that a trouble signal is received at the control unit or transponder under an open loop fault.
At the control unit:
F - Ground fault tested on positive and negative initiates a trouble signal;
R - Input circuit, alarm and supervisory operation, including audible and visual indication;
S - Input circuit supervision fault causes a trouble indication;
T - Output circuit supervision fault causes a trouble indication;...
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