? response on CP3 bottom serial port


William
 

Hello Everyone,
I am getting a ? instead of a 1 as a response to a :Sd or :Sr command on a CP3 frimware V2 using the bottom serial connector.
Is this expected sometimes?  Only sending the :Sd and :Sr every 5 seconds and nothing else is talking to the CP3.

Sincerely,
William

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