From: Newport guy on
Not sure how old is your ESP300 controller, you need to have the latest firmware, 3.09
Here is attached a MSWord document that will help with the GPIB setup.
There is no problem with hardware, the library might have a problem, if you call Newport Technical Support they could provide the Labview example that works fine.


ESP300 GPIB Communication.doc:
http://forums.ni.com/attachments/ni/170/239463/1/ESP300 GPIB Communication.doc