Experimental Physics and
Industrial Control System

On Tue, 13 Nov 2007, Dirk Zimoch wrote:

> There is only one device on the bus. I didn't understand that the
> message means "some device does not release SRQ".

It means that your device (or some device on the bus) is asserting the
"Service Request" line (pin 10), trying to notify the controller that it
needs attention. The controller does a srqPoll to see which device on the
bus has asserted SRQ.  The device should de-assert SRQ when it is polled,
but after 5 tries at srqPoll, the SRQ is still asserted.

First, check that there is no other device on the bus which may be
asserting SRQ. Then check your cable/connectors. If it is still a problem,
it may be a badly behaving GPIB device (which unfortunately is not very
uncommon).

-- 
Steve Hartman
[email protected] || 919-660-2650
Duke Free Electron Laser Laboratory

References:

asynGpib:srqPoll srqStatus is 1 after ntrys 5 Why? Dirk Zimoch

Re: asynGpib:srqPoll srqStatus is 1 after ntrys 5 Why? Eric Norum

Re: asynGpib:srqPoll srqStatus is 1 after ntrys 5 Why? Dirk Zimoch

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