Temperature controller Problems

AI Thread Summary
The Lakeshore DRC-91CA temperature controller is experiencing intermittent command acceptance issues when connected to an old computer via IEEE/GPIB and controlled through a Pascal program in MPMS-Multivu. The device returns an "I/O Canceled" error, indicating problems with command processing, particularly when MPMS-Multivu is active. Troubleshooting suggests that the issue may lie with MPMS-Multivu, as the GPIB interface functions correctly otherwise, but loses track of devices upon starting the software. The temperature controller can display the current temperature but fails to respond to commands, possibly indicating it is not entering a listening state. Further insights or solutions from those with experience in similar setups would be greatly appreciated.
JunkieJim
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I've run into some issues running the probably obsolete Lakeshore DRC-91CA temperature controller in the lab and I'm hoping someone here has some Ideas on what's causing these problems. The temperature controller is currently hooked up to an old computer through an IEEE/GPIB cable and is controlled through this computer using a program I've written in pascal which is sequenced through MPMS-Multivu.

The device seems to randomly decide when its going to accept commands and when it's not going to. I know from experience that it has never worked when you turn the temperature controller on after opening MPMS multivu and only sporadically when its turned on beforehand. I'm fairly sure that it's only an issue with the temperature controller and not with the other devices used. When you send a command the device returns an error "I/O Canceled". I know that if I send an incorrect command or a command with an invalid carriage return then the device will return an error "Invalid Command" and if the command is being sent to a device that doesn't exist I'll get "No Listener".

I've read through the manual for the temperature but it was no help, if anyone has any experience with anything like this and would like to let me know what's going wrong and what I have to do to fix it, I'd really appreciate it.
 
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I've done a lot more troubleshooting and I'm pretty sure its actually a problem with MPMS multivu. the Quantum Design GPIB interface works fine sending instructions to the temperature controller, but as soon as MPMS Multivu is started, the Quantum design interface looses track of all devices, and several reset to their default settings. The temperature controller is the only one that returns an error from being addressed in multivu though, and only when you try to send it a command. Trying to read a command from the temperature controller will display the current temperature. Maybe it refuses to go into a listening state?

Any help as to where to go and what to do would be excellent.
 

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