[GreenKeys] [Bulk] Re: A reliable current-loop-to-RS232 converter

[drlegendre .]

Cool work, Jeff - very tidy job.

Question.. why did you include the RS-232 to TTL module? It seems to be
(almost) totally unnecessary.. For instance, I'm running the circuit from
http://www.aetherltd.com/connecting.html and it connects the DB-9 directly
to the optos.

The latter circuit is used with 120V / 60mA @ 45.45 baud if that makes any
difference, but it shouldn't.

On Tue, Oct 6, 2015 at 6:16 PM, Jeffrey D Angus <jdangus at att.net> wrote:

> 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
>
> --
> Jeff-1.0
> wa6fwi
> http://www.foxsmercantile.com
>
>
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