[GreenKeys] M19 Current Loop Testing

[Matthew Wagner]

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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