Error 37 is suspicious because it's not a VISA error. Can you confirm that you are really using the LabVIEW 7 "Open Serial Driver"? (Look inside that VI and see if it has VISA functions inside it. Make sure your program is referencing the version from vi.lib\instr\_sersup.llb.)
I am wondering if you are linking to a copy of the old (pre LV 7) "Open Serial Driver", which doesn't work with VISA. Let us know. Brian
