The UF3000 does not respond to normal IEEE488 (GPIB) commands.
It has its own cryptic command set of single or a few letters, commands are case sensitive, and depending on prober settings commands may be swapped.
For example, the "W" command can either start a probe tip cleaning procedure or return the wafer ID of the current wafer; it may be swapped with the "b" command.
To retrieve the prober ID use the "B" command, and make sure to terminate all of your commands with CR and LF. The normal VISA call with IEEE488 END character enabled will not append these characters, so you have to append them yourself.
These commands are according to the First Edition of the UF3000 operation manual, dated 2006-09-28, so it's not that the prober is an old out-of-date piece of equipment, the issue is that Accretech produced an instrument which does not conform in any respect to the IEEE488 standards.
Contact me by e-mail me for the GPIB operation manual.
Sincerely,
Leif S. Kirschenbaum, Ph.D.
LabVIEW user since 2.0
