Status byte times out with KS3988 VIs
I am writing a VI that operates GPIB devices that are being controlled by the Kinetic Systems 3988 CAMAC Crate controller. I have been using the KS3988 VIs that are supplied with LabView 5.1. I have found one problem that persists throughout all of my VIs. They will ALL time out on the VISA Read VI if the status byte is enabled. However, if I change the number of bytes for the VISA Read to expect the applications no longer time out and even return a complete status byte. However, with a different byte count my applications return a warning that the byte count is the same as when it entered--I'm not sure what this means, but it's far better than any time out.
I am now attempting to do block transfers and acco
rding to the manual it is best for the status byte to be activated when doing these kinds of transfers. Again, the status byte results in a time out.
Here is the time out error in its entirety:
"Error -1073807339 occurred at VISA Read in KS3988 Status Register Read.vi->Untitled.vi."
Any help would be greatly appreciated.
-Kazem
Hallo,
Concerning "warning that the byte count is the same as when it entered", I
think it only means that there could be more bytes to read. I got a similiar
problem with a Visa application, but i knew that the sent data was exactly
nine byte long. So there was no point waiting for data that won´t come and
therefore I could ignore the warning.
mfg Ricci
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I am using LabView 5.1 and writing programs that control teh Kinetic Systems 3988 CAMAC Crate Controller. I use the KS3988 VIs that can be found on the NI web site.
The one problem that I keep having is that I am unable to get a status byte to return without getting this error in my error out indicator:
"Error -1073807339 occurred at VISA Read in KS3988 Status Register Read.vi->Untitled.vi."
If you actually watch what the Status Register Read VI does, you can see that it does return the boolean values of the status byte, however, it doesn't show them on screen due to the time out.
Thanks.
-KazemI just figured out the problem.
Not all CAMAC crates have the +/- 12 V pin assignment. The status byte, among other things, uses an auxilary -6 V which is supplied by the -12 V pin. The -6 V can be found at pin Y1, or the fourth pin up on the left side of the GPIB slots.
The crate that I have does NOT have 12 V pins. Therefore, the status byte, and things like the Lecroy 2373 Memory Lookup unit DO NOT work.
Being the hack that I am, I wired -6 V of power into my crate, and now everything works. It looks a little dangerous, but it works. -
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