Duvel:
What do you mean when you say "the VISA buffer is on max"? Have you called "VISA Set I/O Buffer Size", and if so, with what size? You should call this with the I/O input/receive buffer mask and with a size larger than what you expect to receive, such as maybe 600KB. Also, which version of Windows are you using? I have seen that call fail occasionally on Windows NT - be sure to check the output error cluster.
Also, what do you mean by saying that the modem connection is 33600 but the serial speed is 115200? I guess I don't understand the way the system is connected.
I know that our customers have successfully used NI-VISA with baud rates up to and including 230400, so this may be a more subtle bug.
If you continue to have this problem, I suggest sendi
ng an NI Spy capture log (if that doesn't make things magically work) and the actual text file being transferred, together in an email to NI tech support.
Dan Mondrik
Senior Software Engineer, NI-VISA
National Instruments