Resetting the Chassis vs. Resetting the Modules

[pallen]

Greetings,

I've run into something new for me on one my recent PXI/SCXI projects.  

The system in question has a PXI rack connected to a remote PC.  An SCXI rack containing two SCXI-1102 (Thermocouple) modules is connected via a PXI-6220

A few times now, I've noticed temperature readings on my LabVIEW application were obviously incorrect.  Restarting the application did not solve the issue.  However going into MAX and Resetting the SCXI chassis did.  

I'm not exactly sure what the root cause of this issue is.  I think it may be that power is being removed from the SCXI rack while the PC and PXI system are still powered up.  Whatever the actual cause is, it's happening often enough that I want to reset all the hardware each time the LabVIEW program is restarted.  

I was able to put together code that will scan for devices and then reset them all.  But I wasn't able to find a way of programatically listing, or reseting the actual SCXI chassis.

Is resetting all the modules the same, or as good as resetting the entire chassis?  
 

[Corby_B]

Hello pallen,

Thanks for your post!

I am sorry to hear that you are getting incorrect readings on your temperature readings. I feel that you are going about this the right way to reset the devices that are giving you the incorrect readings. To specifically address your question about resetting the SCXI chassis, try using the same function you have been using but in the "device input" use "SC1"as the string input. Give that a try and see if it will work to reset your chassis and I would also reset all the cards as well. Take a look at the following knowledge base that talks about the issues with the 1102.

After Restarting My SCXI Chassis My SCXI-1102 Returns Erroneous Data in LabWindows/CVI

Let me know if any of this helps you with your incorrect readings and please post back if you have any other questions.

Cheers!

Corby_B
http://www.ni.com/support