I have coded a simple VI to keep sending a data string over Serial port to a connected device. The data string contains a mix of Boolean and string variables. The code works OK. But i have a problem when something happens to the connected serial device and the data writes do not happen even for a few cycles. I wait for 10 secs and give the user a choice to wait or restart. Though i say "WAIT" it is of no use - as i can see that once the link is broken it cannot re-establish even if the connected serial device comes alive. How does one handle this situation - meaning to auto recover the serial link after a break ? The VIs are done in LV2015. The starting VI is ChoseCOMport.VI.

Why would you uncheck it after reading my post? Automatically select being checked allows LabVIEW to tell you what other installers that should be added because you are using features like VISA. So of course you should include VISA because how else would a computer without LabVIEW know how to use the VISA functions without those drivers. As for reconnecting, right now you just ask if it should close the program. If you get an error, but the user says "Try Again" or "WAIT" as you have, then you should have that selection drive a case structure that will actually wait a bit, then try to configure the serial port again. Make sure the VISA reference wire is on a shift register so that if it reconnects and gets a new reference number, the next iteration of the loop uses that reference. Right now, your next iteration will just use the original because that is what is at the input tunnel, and that one is no longer valid.