What Is the Maximum Timeout for GPIB Operation?

Updated Jul 2, 2018

Reported In


  • GPIB Instrument Control Device


  • NI-488.2

Issue Details

When I try to set a long timeout when using GPIB and VISA, my timeout is limited.  What is the maximum timeout for GPIB communications using VISA?


VISA is an abstraction layer over the NI-488.2 drivers.  When setting the timeout using a VISA property node, the call uses ibtmo which has a maximum value of 1000 seconds. 


Additional Information

If a longer timeout is needed, perform multiple operations and clear the timeout error between each call.