Fail to communicate using 1756-cp3

Sorry, Densam, I missed your reply.

It's a bit too far for a drive out to test the unit, but I am willing to test it here if you want to post it to me. I can also determine if it is one of the units Ken talked about.

PM me if you are interested ....

Another thought has occurred to me - are you using a USB to serial converter on your PC to talk to this controller on RS232-DF1. Some (many) of the converters on the market do not work effectively.
 

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