Time out RS232 with windows 7

I have a LabWindows 2010 application using RS232 reception with ComRd function. It works well on a windows XP with a RS233 port.
I have a usb-rs232 converter, it also works.
Now, I have to use a new PC with windows 7 and no RS232 port, so I have to use the usb-rs232 converter. The application does not work, I have a timeout with the ComRd function. In fact, I have to receive 3328 bytes but the application receives approximatively 3300 bytes before timeout. What is the problem ?

sfla ha scritto:
The ComRd is set to 0 => timeout according documentation
I don't understand this sentence: can you post the full opening/timeout/read instructions?
In any case, 1 start bit + 8 data bit + 1 stop bit: 10 bits/char
3328 characters @ 9600 bps means approx. 3.4 seconds, which means the timeout value is too short for the transmission!
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Time out RS232 with windows 7

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