Can I reset serial ports without rebooting?

I have an application that communicates with a SilverMax servo drive over RS232. If the device is off when I run my VI or if it gets turned off during a program run, the serial port locks up at the VISA serial write VI. I need to hit the reset button on the PC to recover.

Hi TAS1,
Try the Basic Serial Write and Read Example VI, and see if the example works. You can find the example in the NI Example Folder, which you can access by navigating to Help » Find Examples... in LabVIEW. The behavior you described is unexpected. Make sure that there is a delay, as shown in the example, and that the VI executes all the way to the end, where there should be a VISA Close. It is important that VISA Close executes, because this clears the VISA resource. Please let me know if you have any questions about the example.
Regards,
Rima
Rima H.
Web Product Manager

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