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    Jandy Aqualink RS (PDA-P4) and no serial signal (RS-485)

    I have a Jandy Aqualink RS (PDA-P4 version) with a PDA. (picture attached) PDA seems to have stopped working Used to work but now is stuck in WAITING mode Green and Red lights are on Tried to power off using the circuit breaker, remove 9V battery, reconnect the 9V battery Power on - no luck...