GPIB vi created with Instrument I/O assistant not timing out

I am new to Labview and I am trying to write a
program to control a HiPot tester via GPIB. This HiPot tester is used
on several other projects, so its GPIB address can vary. I want to use
Labview to scan for this device on the bus and then configure it.
I used the Instrument I/O Assistant to create a subVI that can query
the device for its manufacturer and model information. In this VI I
created some connectors that allow an outside program to input the bus
and device number. These numbers are formatted into a string and then
used to send commands to the GPIB device.
If I use this vi and specify the correct bus and device IDs for the
hipot tester, I get back the expected data. However if I send in the
wrong device ID (or wrong bus), the program hangs.
The Instrument I/O Assistant creates a timeout value of 2000 msec for
the operations. The *RST and *IDN? commands are sent first and then the
VI performs read operations to fill 128 bytes. So I figure that the
longest this should take to timeout is 2000*130 msec = 4.3 minutes. But
10 minutes later the VI is still running.
Why does this operation not timeout if the device and bus IDs on GPIB are not correct?
Brian Rose

Hi Brian
the first problem would appear to be that you send a reset command. But you only give the instrument
100ms to reset/reboot before your query its identify. If you have the instrument manual check to see actual timing
of bus etc.
As a rule of thumb I wait 300ms - If you run NI spy you will be able to see exactly when processes occur.
Add a sequence frame between reset command and id command.Place a
wait icon in the frame with a control on the input time so that you can
adjust time from front panel.
Initially set time to 400msand see what NI spy reveals.
Go for it
chow xseadog
Message Edited by xseadog on 09-10-2005 01:47 AM
Attachments:
wait.PNG ‏11 KB

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