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From: "Michael A. Terrell"
Subject: Re: telex interface
Date: Thu, 28 Nov 2002 10:55:33 -0500
Organization: Have you seen my bench? No, really! Where is it?
X-Mailer: Mozilla 4.61 [en]C-CCK-MCD (Win95; U)
Spehro Pefhany wrote:
> On 28 Nov 2002 04:40:03 -0800, the renowned BGH_Behnam@yahoo.com
> (Behnam Ghiaseddin) wrote:
> >hi all
> >I want to build a circuit which can send and recieve telex
> Telex?! You want to send data to a '43 printer or something?
> IIRC (and subject to bad memory), it's something like 20mA
> current loop at 110 baud. Maybe someone else remembers.
> I doubt modern PCs will go that low, but very old XT AT
> ones should if you want to test it. You'd need a converter,
> if I'm right about the 20mA, something like this one:
> But do check it out before making/buying anything.
> >any hint, URL, component or circuit are so useful
> >thank you a lot
> Best regards,
> Spehro Pefhany
> "it's the network..." "The Journey is the reward"
> email@example.com Info for manufacturers: http://www.trexon.com
> Embedded software/hardware/analog Info for designers: http://www.speff.co
My modem and serial port will both will do 110 baud. This is on a
733 MHz Celeron E-Machine with Windows ME that is a little over a year
old. Some of the newer alarm systems can be monitored or reprogrammed
through the internal modem at 110 or 300 baud. They use out of date
protocols to avoid patents, and to make it harder for someone to stumble
across the right setup. I had to help an alarm company straighten out
several machines used to test and program their customers systems over
Michael A. Terrell
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