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Subject: Re: Line-powered EIA-232 interface
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Date: Sun, 15 Dec 2002 15:01:40 GMT
NNTP-Posting-Date: Sun, 15 Dec 2002 16:01:40 MET
Organization: Telenet Internet
I don't need the handshake lines so it could be a solution.
The comm program running on the PC side was written in Delphi5, using the
freeware VaComm component.
It doesn't have any documentation, so I don't know how to control the
Do you know of a Delphi component which allows control of the handshake
lines under Win2000?
"Tilmann Reh" wrote in message
> Steven schrieb:
> > I have a low power microcontroller running from a 3V Li battery.
> > Want to interface it to a (laptop) PC's EIA-232 interface.
> > I'm aware of the DS275, which was designed for this purpose, but it
> > 5V power supply. I thought I could get a + and - 10V from the PC, but
> > checked I only measured the -10V on an idle connection.
> > Any ideaz? (may be with discrete components, but should tax the battery
> > little as possible; the battery should last several years).
> If you don't need the handshake lines you might program them to be
> constantly active while the according PC program is running.
> Then there will be about +8 to 10 volts, with enough power to
> supply a lowest-power transceiver.
> Dipl.-Ing. Tilmann Reh
> Autometer GmbH Siegen - Elektronik nach Maß.
> In a world without walls and fences, who needs Windows and Gates ?
> (Sun Microsystems)
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