VISA performance

[task]

I have two machines running the same program, interfacing with a serial device. Both are running Labview 6.1, NI-DAQ 6.9.3. The only difference is one machine is Windows NT, the other Win98. The Win98 machine runs the serial program about 3 times as slow. There is no difference in the program. Any clues?

[Matthew C]

Hello task,

Thank you for contacting National Instruments.

Since serial communication is asynchronous and uses a software buffer, the speed at which your system can run software will greatly influence your perceived communication speeds. At the hardware level, your transmission speed will be the same. However, your Windows NT system may be accessing the software buffer much faster than your Windows 98 system. This could be for any number of reasons, including processor speed, available RAM, and the number of processes running in the background on each system.

I hope this helps! If you have any other questions, let me know.

Matthew C
Applications Engineer
National Instruments