Re: RS-232 Digital thermometer - interface and driver - USB?
From: Keith (keith_rhodes_at_yahoo.com)
Date: 05/12/04
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Date: 12 May 2004 01:46:14 -0700
keith_rhodes@yahoo.com (Keith) wrote in message news:<ed8f2788.0405110050.78680f2e@posting.google.com>...
> Jeff Breitner <usenet@rudn.com> wrote in message news:<10a0fa8r51n5rfd@corp.supernews.com>...
> > Keith wrote:
> > > Hello, all.
> > >
> > > I recently got a new toy, a Voltcraft 304 4-channel digital
> > > thermometer. For now, I'm just going to use it as a display unit for
> > > thermocouples, but I'd like (at some point in the future) connect it
> > > to a computer to log data over time, and maybe sound an alarm if the
> > > temperture starts to go out of certain bounds.
> > >
> > > The thermometer has an RS-232 bi-directional serial interface, through
> > > a 3.5mm jack (like stereo headphones).
> > >
> > > I seem to remember reading somewhere that the D-shell serial interface
> > > (that my external modem is on at the moment) is also RS-232, so I
> > > imagine I can make up a cable for myself, knowing the GND, Tx and Rx
> > > pins on the D-shell and the corresponding parts of the jack plug.
> > >
> >
> >
> > If it is truly bi-directional, then the tip of the jack is either tx
> > data or rx data, the ring is the opposite of the tip and the sleeve is
> > ground.
> >
> > So, if the tip is tx, then to connect it to your computer you'd connect
> > that to the rx data on the rs-232 connector. If the tip is rx, you'd
> > connect that to the tx data of the rs-232 connector. Ground goes to the
> > ground on the rs-232 connector.
> >
> > Make sure your terminal program turns off hardware and xon/xoff
> > handshaking for this type of connection as there is probably no flow
> > control. If the program you use to read the serial port can't be
> > configured this way, you may need to dummy up the rs-232 connector to
> > simulate a null modem.
>
> You're right. Tip is Tx, ring is Rx and sleeve is ground. I was
> looking in "Running Linux" by Matt Walsh last night (my 1995-ish
> edition), at null modem cables, and there's a pin description there
> for a 9-pin D-shell layout. Cross over Tx and Rx lines, and connect
> ground to ground.
>
> Keith.
Right, last night I took the cable from an old mouse that I hid away
in a drawer when it started behaving erraticaly. I just knew I'd find
a use for it one day.
I'm off for a 3.5mm jack plug at midday and a serial port to USB
adapter if I can find one that's not expensive.
I know that this is adding an extra layer of complexity, but has
anybody had any experiance with a serial port to USB adapter?
Keith.
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