Com Port Finder

[ADrexelDragon]

The com ports are very tricky to calibrate. They change sometimes when the hardware is connected. I thought my solution was to search for all the com ports and send an id to them. Look for one that returns the hardware. Then I can use that com port in the rest of the program.

Another idea was to create a button that would open up MAX then go to devices and interfaces then go to serial. This would be used to identify the com ports that are connected. The user would have to input what is seen in MAX.

[RavensFan]

If you put a VISA com port control on your front panel, it should show all of your valid com ports, then the user can pick which one they think is correct.

[ADrexelDragon]

Okay. The thing that was happening was the correct comport was always right after com 3. I thought I could just search for the com port but I guess I can't. Thank you.

[Dennis_Knutson]

Of course you can. You get a list of all com ports and send the *IDN? command. The one that you get the correct response from is the one you use. It is not enough to just send *IDN? if multiple instruments are connected and more than one uses the command.

[ADrexelDragon]

That is what I tried to accomplish in my Com Finder Vi.

[Dennis_Knutson]

You started okay but as already mentioned, you are not doing a coorect read. It simply does not make any sense to wire the bytes written to the number of bytes to read. You also had no code to handle the responses you did get back or even a read timeout.

[ADrexelDragon]

That is true. I will work on that. Thank you.