Sometimes GPIB controller did not command the instrument to talk while the high-level program did have "READ" command.

GPIB controller should send "UNL", "LA0", "TAxx" to command the instrument to talk. Though the program do have the "READ?" query, sometimes GPIB controller didn't send the above commands from NI Spy, resulting in the system is hanging there. It happens randomly.

HI,
It is not clear to me what is going on. I'd like to get more information.
Could you specify what programming language are you using?. Also, what functions are you using?. What driver version are you using?.
Include any information you think might be helpful. Also, attach the Spy capture.
DiegoF.

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