Visa error -1073807339 when reading or writing to com 2

Good morning,
I am using both com 1 and com 2 to communicate with instruments using Labview 7.1 and Windows XP. Com 1 which works without any problems is communicating with a HP 34970A and com 2 which sporatically works is communicating with a Valhalla 2430 power analyzer. When I get the error, I open MAX and com 2 has an explanation point indicating a problem.
Thanks for your help.
Everett

Hello again and thank you for all the responses. Valhalla charges money for their driver so I doubt they would want it posted in the discussion forum. I ran NI-Spy and will attach the logs. I also changed the byte count from 32 to various lower numbers but 21 seems so far to operate without an error running the Valhalla VI only. This afternoon I will try it again in the program to see if an error occurs or if I don't get my data sometimes. Capture 1 was done using max and open visa for com 2. I ran it several times. Capture 3-1 is after I changed the byte count to 21 and added some delay on the VISA read.
For some reason it won't let me post a .spy extension
The file does not have a valid extension for an attachment. jpg,gif,txt,xls,vi,zip,doc,bmp,llb,pdf,png,seq,c,h,cpp,cs,vb,ini,gz,ctl,scr,ico,tar,z,uir are the valid extensions
Everett

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