What is the 34939T interface wiring that is not shown on the pin out to allow a
The pinout table for the two 78 pin Dsub connectors is in the 34939A User's Guide which you can download from the 34939A Product Page on Keysight.com. There is an NO (Normally Open) and a Common pin for each of the 64 channels.
... to allow the module to be used without a 34939T Module?
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