EABO(6) error when trying communication between HP34401A and GPIB-PCII in VB6.0

[EvaJ]

Recently, I installed a GPIB-PCII card in Win98,the driver is NI 488.2, I connected HP34401A to GPIB port, all of them were installed successfully and I can communicate with them by using IBIC(Interactive Control) , but when I run some VB program that downloaded from NI web in VB6.0. I found
some of HP34401A commands can work ,some of them can not work and got EABO(6)failure. the detail is as following:

using *ISDN? --- OK
using *TST? --- OK
using *cls --- EABO(6)
using *rst --- EABO(6)

I don't know if it means my GPIB instrument can read but can't write?

I set the primary address of HP34401A
is 11.the timeout is 10s.

[Randy Solomonson]

Hello-

The *cls and *rst commands are write commands that return no data. If a read is attempted after these commands it will give the EABO(6). The commands that end a question mark all return data, so a proper read will not return an error

Randy Solomonson
Application Engineer
National Instruments