Audio Developments AD256 User Manual
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Communications from external 1 outstation to the mixer operator is initiated at the
outstation and feeds the PFL mix busses. This is achieved by grounding pin 6 of the 6
pin XLR. Like other PFL signals it is under logic control and replaces any other signal
on the monitor output.
When PFL is selected on an input channel or when the outstation wishes to
communicate with the mixer operator (by grounding pin 6 on the multiway), logic
changes the signal on monitor output accordingly.