Thread: Serial Port Communication White Paper
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Unread 13-06-2002, 09:14
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Matt Leese Matt Leese is offline
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It seems very strange that your computer is setup to use COM3 and 4. I've never seen that. Normally a computer is setup so that the serial port is COM1 and the modem as COM2 (or vice-versa; modems have hardware, called a UART, so that they are treated exactly the same as a serial port). I would suspect that for whatever reason windows is actually letting you open COM3 even though it's not really connected to anything (the open command should fail at that point). I'd also check to make sure that your modem isn't on COM3 (as you should be able to open that). Just as an fyi, 51 is 0x33 and -51 would then be 0xCD which isn't any sort of code that I know. Anyone know any different?

Matt