Accessory connector with E-prime

I have some difficulties in using RB 530 with e-prime in PST 200A emulation mode.
We need to use the Accessory Connector for acquiring some input signals as input lines as we did with PST 200A.

We have made various different tests but we are not able to use them as inputs.

Does anybody know the correct procedure to do it?

The Accessory Connector cannot be used for input, only output.