[GreenKeys] Who made this RS-232 / Current Loop converter? Any docs??

[drlegendre .]

Howdy,

Yep, that's the same item.. so we'll go with Camiacs as the mfr. I've
searched and found a couple more photos of the same converter with yet
another name stuck on them, so it looks like they must have OEM'd this
model for a variety of companies. There have to be some docs for it out
there, just a matter of where..

As for the outlets, I think they're just utility sockets in parallel with
the IEC connector. I don't see any relays or the sort of power devices that
would be needed to switch them.

One unit has had almost every IC replaced, the other looks like only the
optos were changed. The mfr. was thoughtful enough to socket everything, so
they must have had some experience in the field.

I'm curious about one thing. Were these units ever used in pairs, to extend
the maximum run for RS-232 devices? RS-232 is only good for distances
measured in feet, but CL lines should be good for miles, I'd think?

On Tue, Dec 2, 2014 at 9:09 AM, Chris Elmquist <chrise at pobox.com> wrote:

> On Monday (12/01/2014 at 08:27PM -0600), drlegendre . wrote:
> > Any idea who made this, or where I can find a document? Some quick pics
> are
> > at:
> >
> > https://nerp.net/~legendre/greenkeys/rs232_cl_converter_01.jpg
> > https://nerp.net/~legendre/greenkeys/rs232_cl_converter_02.jpg
> >
> > The only logo on the case looks like "ED&M" which might also be :"EDeM"..
> > Other sources indicate that it was made by "Camiacs" - and the circuit
> > board is marked:
> >
> > "RS232 / CL MODEL 5"
> > "CAM 25-116A"
> >
> > So perhaps 'CAM' = Camiacs? It has several series of internal jumpers on
> > the board, so it looks like it can be configured in multiple ways.
>
> I concur with that analysis.  If you feed Google, "RS232 / CL MODEL 5",
> you get lots of links to Camiacs RS232/CL converters, including this one,
>
> http://www.ebay.it/itm/Camiacs-RS232-CL-Convereter-Model-V-/180909962801
>
> which has their logo in place of the ED&M on yours.
>
> > Oh, and FWIW - on the RS-232 side, pins 2,3,5,6,7,8 are in use. The CL
> side
> > has pins 1,2,3,4 in use.
> >
> > Thanks for any help! I have two of these now, and it would be nice if I
> > didn't have to reverse-engineer them to put them to use..
>
> I didn't find any hints of online documentation.  I'm betting it will
> be faster to reverse it and make your own schematic.  It shouldn't be
> a very complicated circuit.
>
> Are the AC outlets in parallel with the AC input or are they somehow
> controlled by the circuit (ie, some kind of auto-power off when line is
> idle or code controlled maybe?)
>
> --
> Chris Elmquist NØJCF
>
>
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