Serial Comunication with LabView

[Jacopo]

Hi everybody!

I've a problem with the serial comunication menaged by LabView...

I've a PC with two serial ports (COM1 & COM2) and I realized two really simple programs to test serial communication: 

• "Serial Tx"  to transmits the string "AA" from port "COM1".   
• "Serial Rx"  to receive this string from port "COM2".

I've checked with the oscilloscope and the string is properly generated by COM1...

I start "Serial Rx" and after this, I immediately start "Serial Tx"... But I don't read anything and after the timeout value "Serial Rx" ends

Can you help me ?!?!

Thank you very much!

[muks]

Can you post the screen shot of your vi or post it for Lv 8.0?

[smercurio_fc]

You only need one serial port to talk to one scope. The serial port does both send and receive. RS-232.

[muks]

First try communicating with Hyperterminal. If you can get that to work, the LabVIEW should have no problem.

[Dennis_Knutson]

If you are just doing a loopback test, then verify you have the correct type of cable. You need one that swaps the Tx and Rx lines. Your comment about the Rx VI stopping does not make any sense. It's supposed to stop whether it reads anything or not. You have no loop there to read continuously.

[Jacopo]

Ok...

I attach the screenshoot of the programs.

I don't want to comunicate with the oscilloscope... I want to send datas by one port and read them from another one of the same PC!

I just controlled with the oscilloscope if they go out from the sending port...

[Dennis_Knutson]

As I said, check your cable. Also, as has been already mentioned, try Hyperterminal. If that doesn't work, you've got the wrong cable (or a bad serial port).

[muks]

Try "visa configure serial port" first it should work.

[Jacopo]

The cable was the wrong one!!!

Thank you for the suggestion!