[GreenKeys] Current Loop to RS-232 Conversion on ASR33

[epvgk at limpoc.com]

On Sun, Mar 24, 2013 at 11:44:04PM -0000, Rob Jarratt wrote:
> Yes, I think what you say may be right (although mine does not have a
> telephone panel). But even if you are right and it does have a loop supply
> inside the ASR33 why does it only appear to output about 10mA and then drop
> to the point that it starts to chatter as if it was open? Yet, when in local
> mode it works perfectly, so the current would *appear* to be enough.
> 

It's also worth considering that if you did at some point connect more than
one highish-voltage supply into the loop in series, you may have damaged either
the current loop converter or the tty's solenoid driver? 

eric