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    SubjectRe: interface for modems with out of band signalling
    Oliver Neukum wrote:
    > Hi,
    >
    > I have got a question about modems which use the AT command set, but
    > don't use in band signalling like true rs232 modems. Would two device nodes
    > per communication channel be a good interface?

    Huh? What do you mean "don't use in band signaling"? If you are asking
    how you issue AT commands to the modem while connected, you have to
    break to command mode. IIRC, this involves sending a special break
    character or two with the correct delay between them, or flipping one of
    the RS232 handshake lines.


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