GPIB-USB- vs PCI GPIB Adapter

How do these cards act differently on the GPIB bus? I am using the Prologix concept of GPIB to serial conversion and have it working perfectly until I attempt to change the address or use any sort of the ++command set type. I have my set up working fine with the NI PCI-GPIB adapter but get the error when attempting ibwrt:

[8100] <err cmpl>

error: EBUS

count:0

I need to tweak my software slightly to be able to talk to the GPIB-USB-HS. It similar to the problem this guy is having which he didn't solve:

https://forums.ni.com/t5/Instrument-Control-GPIB-Serial/Difference-programmatically-between-NI-GPIB-PCI-and-NI-GPIB-USB/m-p/3608184#M74425