[GreenKeys] A reliable current-loop-to-RS232 converter

[Steve Garrison]

I also use John's design with absolutely no issues.  At several Makers
Faires, and will be at our HamFest on Nov 7 & 8.  Sending and receiving text
messages via GoogleVoice.  The kids really love it, they can't get over
these mechanical marvels that were designed without the aid of a computer.

Steve G./N4TTY

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John Nagle
Sent: Tuesday, October 06, 2015 8:21 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] A reliable current-loop-to-RS232 converter

> Date: Tue, 6 Oct 2015 18:16:53 -0500
> From: Jeffrey D Angus<jdangus at att.net> To:"greenkeys at mailman.qth.net"  
> <greenkeys at mailman.qth.net>
> Cc: Gabriel Egan<mail at gabrielegan.com>
> Subject: Re: A reliable current-loop-to-RS232 converter
>
> Some time back, Gabriel was looking for an RS-232 to TTY loop converter.
> I shot my mouth off and said, "If you can't find one that works, I'll 
> make one for you."
>
> Well, here it is.
> RS-232 to TTL level converter, then a pair of opto-couplers to sense 
> and key the TTY loop, and a built in power supply for the loop itself. 
> With selectable 20 or 60 mA operation.
>
> It's been a fun project.
>
> Jeff

    That's very similar to mine, built in 2009:

  	http://www.aetherltd.com/aesthetic.html

It's just what you'd expect - a 120VDC open frame supply, a board with
opto-isolators, solid state relay for motor cotnrol, and a USB to serial
interface.  The two indicator lamps on the front are power on (white) and
motor on (red).  The meter is loop current.

It's somewhat overdesigned.  I built two of these, and they've now been to
seven steampunk conventions.

    Many of you have seen the video before, but here's the link:

    https://vimeo.com/124065314

				John Nagle
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