[GreenKeys] i-Telex and auto-start.

[Jeffrey D Angus]

The normal operation of the TW39 card is with the call control units
used with the Telex network.
There is a polar relay in the call control unit that senses the line
polarity and turns the TTY machine on when is reverses.

The Lorenz Lo-15b that I have has this and operates this way.
The Teletype Model 32 with the call control unit for the Western
Union TWX service operates the same way.
Ken in Canada has a Teletype Model 32 with the call control unit
connected to the i-Telex system using a standard TW39 card.

Henning is working on a modification to the TW39 card to use with
Teletype machines such as the Model 15 without a call control
unit. The "secret code name" for this is USTTY.

Operation of a Teletype Model 15 is simple.
The loop is energized (mark) at all times.
To initiate a call, hit the break key to open the loop momentarily.
The i-Telex unit will send "No?" and expects you to type the number
you wish to call.
It will send the time and date to let you know you are connected.
To end the call, you hit the break key again.

In parallel with this, is making an "auto-start" signal available from
the USTTY card (normally, this is the polarity reversal signal) for an
external motor control relay, such as the Crydom MCX240D5.
<http://www.mouser.com/ProductDetail/Crydom/MCX240D5/?qs=sGAEpiMZZMsEIsGLxVc9kG%2fb8YFK%2f7Zg>

Jeff
i-Telex number 67045




-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com