Reestablish labview connection with oxford intelligent gas handling system connected by RS-232

[wf239]

Dear community,

I would like to ask some help.

Our oxford Kelvinox dilfridge uses an intelligent gas handling (IGH) system controlled remotely on a computer that runs Labview 6.1. It is connected through RS232 and then a RS-232 to USB converter to COM4 on the lab computer. One of my labmates accidentally pressed the local/remote button on the IGH and it is set to local control instead. Switching back to remote control did not solve the issue. I have tried power cycling the IGH but it is now locked in local. From my searches online it seems like that this would be a serial connection and therefore would not require a GPIB setup, but when I rerun the oxford IGH initialize and setup scripts the connection is still not established. I have never used labview before so I am having great trouble trying to reestablish the connection. Attached is a copy of the screen when we just found out IGH was disconnected.

Thanks in advance!

[Albert.Geven]

Hello

Did you try all the com ports that you see in the project file, or only port 4?

You can check in the windows system which serial port is used by the ftdi device.

[wf239]

Thanks for the reply! I unplugged and plugged the USB port connected to the pc and com port 4-7 popped up. I was somehow able to change from port 4 to port 5, but could not change the port to 6 or 7 or back to 4. Every time I try setting a different com port in the IGHUpdateSetup.vi, IGH Setup window, after running the port resets back to 5. Setting the com port to say 6 in IGHInitialize.vi will still result in error message of rs232 timing out with port 5. There is probably something very dumb that I am missing here, and once again thanks for the reply!