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From: Marco M. on 23 Sep 2005 08:58
I'm newbie for lab view, I would wanto to use the modbus library.
If I use the example inserted into the library with a normal rs232
port, all work fine, if I use a virtual usb-232 with the texas chip
(TUSB3240) I see this message:

Error -1073807298 occurred at VISA Write in MB Serial Transmit.vi->MB
Serial
Master Query.vi->marco.vi
Possible reason(s):

VISA: (Hex 0xBFFF003E) Could not perform operation because of I/O
error.

I have tried this virtual comm with other program and all work fine.
Anyone may help me ?

Thanks in advance
Marco

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