Hello,
The errors on PrInit usually indicate a basic communication issue between the computer running the ACS software and the prober.
Often times you need to set GPIB address or other parameters for remote operation of the prober.
I suggest to consult the Sentio Remote Commands manual for the setup info.
Also, sometimes using a utility application like VISA Test Panel or NI IOTrace to validate basic communication with prober prior to using ACS can be helpful.