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    SubjectRe: modifying line state manually on ttyS
    On Llu, 2003-04-07 at 16:02, Michael Buesch wrote:
    > I have developed my own device, that is connected to ttyS0.
    > To talk to my device, I need to set the state of the TxD line
    > manually to either 0 or 1 (+12v or -12v). What I try to say is,

    TxD is a bad choice. A lot of the hardware cannot control TXD this
    way. DTR is the usual one because it is easy to handle but there
    are other control lines you can drive directly (see TIOCGMODEM)

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