EABO(6)

Hi All,

I am using NATIONAL INSTRUMENTS NI PCI-GPIB WITH NI-488.2 778032-01 (system controller) to communicate with two tester. 

Here is the problem, the bytes i write sometimes is not match with the ibcntl and cause EABO(6). Please see the attached picture from NI trace.

ibwrt(UD1, "S:C?" ,6) but the ibcntl is only 0x0001, where ibcntl indicates the number of bytes that were successfully transferred during the last I/O operation.

Is this hardware problem or my software problem? Please help.