error in Visa configure serial port -1073807246

[tBlum]

Hello,

I'm trying to open a two serial connections in my vi. The first one with a motor controller, and the second with a laser. When i connect the controller to COM1 and the laser to COM2, I allways get the same error when I try to set the connections: "Error -1073807246 occured at Property Node (arg 1) in VISA Configure Serial Port (Instr).vi->getsSerialPort.vi"
Possible reason(s): "VISA : (Hex 0xBFFF0072) The ressource is valid, but VISA cannot currently access it."
However, when I ask "*IDN?" with the visa test panel on MAX before running the vi, everything is fine for both ports.

The tricky thing is that if I change the connections to have the laser on COM1 and the controller on COM2, it's running fine. Nevertheless, I'd like it to be independant of the port, as I want to run it on different computers.

Regards,
Thomas

PS: I'm using LabVIEW 8.2 with VISA 4.1

[Wayne.C]

Thomas,

Can you post a copy of your code?

[tBlum]

Sure, here you go. The first screeshot shows the main initialisation. The "tempo init"  vi just allows the user to choose which port to use for the devices. Then , the "motor port" subvi's on the upper part are provided by the manufacturer and are using a dll provided by the latter. The "get serial port" subvi on the lower part is shown in the second screenshot. The Z-TEC scope device is not giving any trouble.
Hope this will help, don't hesitate if you need more info.

Cheers,
thomas

[Wayne.C]

What does the vi that opens the motor port ( Open Port? ) look like?  It sounds like the motor port is defaulting to a particular COM port.