I have a CAB-1, later model PM-1 with COMM/CONV switch and a ZW for power. CAB-1 beeps when I press buttons. When PM-1 is set to COMM, my conventional engines can be controlled by the ZW throttle. But when I set the PM-1 to CONV, the CAB-1 controller does nothing. How do I know if the CAB-1 is communicating with the PM-1?
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