On 2011-02-18 18:51, Funny NYPD wrote:
> Just measured the output  pins on desktop RS232 ports:
> Pin 3 TXD: -11V
> Pin 4 DTR: -11V
> Pin 7 RTS: -11V
>
> So DTR output negative (-11V) voltage by default.
> I am curious is there a way prevent Tera Term change DTR pin to Posigve (=
+11V)
> voltage?

The operating system raises DTR when the port is opened. A program such=20
as Realterm ( http://realterm.sourceforge.net/ )  will let you toggle=20
the individual modem control lines.
( http://realterm.sourceforge.net/#Pins__Status )

Joe



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