[GreenKeys] M32 interfacing

[Don Robert House]

I have alsways just used the loop rather than tapping into the SMD 
circuitry.  I set a loop supply of 120-130 vdc to 62.5 milliamps with 
two machines wired in series into the loop.  The machines usually 
have a mounting cord on them for this purpose.

The M32, if it is a former Telex, it uses the ITA2 version of Baudot 
code.  It is a 7.00 unit code with 1 start bit and 1 stop bit, which 
is 50 baud and 67 words per minute.

Don


>Hi folks:
>
>There is a fellow on a computer list who has an M32 telex machine, who
>would like to get it working.  I told him what I thought it was:  5-bit
>baudot (1-start/2-stop?), 50-baud.  Is that correct?
>
>I know the telex interface is a speciallized DC-signalling scheme, but I
>understand that you can drive it directly with a 20- or 60-mA current loop,
>without needing to tap into the selector-driver card.  Can someone
>enlighten me as to exactly how this is done?
>
>Any details appreciated.
>
>thanks,
>
>gil
>
>
>
>
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-- 
--------------------------------------------------------
Don Robert House
North American Data Communications Museum
URL: http://www.nadcomm.org
Computer Museum of America
URL: http://www.computer-museum.org