[GreenKeys] M19 Current Loop Testing

[William Wuttke]

Matt,

A pretty good solution is at:

https://www.heepy.net/index.php/Optocouplers_for_teletype_current_loop

It works well.

Bill

On Thu, Mar 17, 2022 at 5:23 PM Matthew Wagner <mattwagner92597 at gmail.com>
wrote:

> Hi all,
>
> I'm relatively new here, but I've been working on my first restoration (an
> M19) and I'm pretty close to having it done. The only thing left to test
> out is the actual Tx/Rx loop circuits.
>
> I'm not entirely sure where to start out looking for something to
> interface with the 60mA loop. Preferably RS232 or USB to make things
> easier. I want to eventually get it up on ITTY once everything's working
> properly.
>
> If anyone has some pointers on some gear to start looking for, I'd
> appreciate some direction.
>
> Much Appreciated,
> Matt Wagner
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