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Should be something like:

sserial_port_0=000xxxxx

or

sserial_port_0=002xxxxx

Assuming you want the 7I84 to run in mode 2.

There is no sserial_port_1 in 7i77x2 configurations
(there is only sserial_port_0 with 6 channels, 3 for the first 7I77 and 3 for the second)

Yes, I overlooked the /usr/bin/pncconf in my search. The problem was that the pin number for the 7i95t first encoder port was 0 which caused "if self.d._arcvin ..." to evaluate to false. I fixed it by using "if self.d._arcvin != None ...".

Video on youtube?