--- In "Joel Winarske" <> wrote:
>
> mathlaj wrote:
> > Hi,
> > I would like to know if this is possible to bring the TS-7200
+5VDC
> > over the COM2 port (RS-232) to my custom device.
> > As the COM2 is only using the pins 2,3 & 5, is there another pin
that
> > can be driven to the +5 VDC to bring power to the distant device??
> >
> > To explain a bit more what I need:
> > My device communicate RS-232 with the TS-7200 and is powered
+5VDC and
> > need a maximum of 55mA of current, more of the time consuming near
> > nothing (40uA).
> >
> > A MAX232 is not providing me enough current from the Rx/Tx pins
> > (typically 30mA for what I read). As my device is more often
sleeping
> > than running, I guess I could use some capacitor, but this is not
the
> > path I wanna take.
> > Actually, I use the 10th pin of the ribbon cable, connected to the
> > +5VDC of the board, but I'd rather use a normal DE9 cable going
to my
> > device, as this is much more common and tougher than a ribbon
cable.
>
>
> The RS-232 signals RTS and DTR (outputs) are usually used for
powering
> devices like this. One example is the Dallas 1-Wire serial
interface.
> The far end device connects the CTS and DSR signals to the voltage
> regulator via diodes.
>
> So if the TS-7200 offers an RTS signal on one of it's com ports,
you are
> half way there.
>
>
> Joel
>
That is also what powers a serial mouse's circuitry. This does work
on 7250.
/js
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