Robert Findlay wrote:
>
> I have a requirement to be able to manipulate the RTS and DTR lines as part
> of the project I'm working on.
>
> Any pointers would be appreciated. So far none of my books tell me very
> much about manipulating the serial lines at this level.
>
Refer to a Datasheet of an 8250 (UART) - compatible chip, for example
www.national.com/ds/PC/PC87310.pdf
There Yoe see, that there's a register at Offset 4 to the serial line adress,
called 'modem control register' or so.
In this and some other registers You should be able to manipulate the handshake
lines.
Yours
Bernd
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