Timing / buffering problems

Hi, I am trying to operate the SRS SR400 photon
counter using LabView. I have an optical chopper as the external
trigger and I am using both channels A and B in a gated way. Basically
I can get the photon counter to operate perfectly, but if I collect
only one data point at a time in Labview, the data displayed is that
recorded on the photon counter 7 counts previously. If I ask LabView to
record say ten counts, I generally get 9 of the same number repeated
(the same number which appeared on the SR400 7 counts previously) and
the a random 0 or 6. I am using a new NI USB-GPIB card to interface the
PC and SR400. I am sure the problem lies in some buffering or
handhsaking issue, but I'm relatively new to LabView and can't figure
it out. Any help will be greatly appreciated!
The code I'm using is attached
AllThatStuff.vi (76 kb)
SR400 Read_e2.vi (130 kb)

Greetings efcloos
I don't know which discussions Khlume was referred to. However, I looked for the driver in the NI website and noticed that it is not NI certified. Which means the driver is probably incomplete and hasn’t been tested. So what I did is find some discussions related to the driver:
http://forums.ni.com/t5/LabVIEW/SR400-change-from-GPIB-to-serial-RS232/td-p/2474706
http://forums.ni.com/t5/Counter-Timer/SR-400-gated-photon-counter/td-p/519716
http://forums.ni.com/t5/LabVIEW/Serious-bugs-in-the-SR400-gated-photon-counter-LabVIEW-drivers/td-p/...
But also I will give you these links, which I believe will be more helpful to you.
http://www.ni.com/white-paper/3271/
http://zone.ni.com/reference/en-XX/help/371361J-01/lvhowto/modification_instruct/
Write back if you have additional questions.
Regards.
Luis J.
Applications Engineer
National Instruments

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