[GreenKeys] Manual for Teletype EIA-232 Current Interface

[Sarah Autumn]

Thanks for the info Justin! Much appreciated.

On Tue, Jul 28, 2015 at 9:17 AM, Justin Scott <tty at impakt.net> wrote:

> So, I've been following this with some interest since I had to build my
> own interface so I could hook a modern computer to my Model 33 ASR to dump
> some tape images to the TP, I never knew that Teletype created their own
> interface (or, possibly re-branded someone else's stuff).
>
> This setup looks to be nicely done, possibly opto isolated on both ends,
> with proper level shifting to address the +12/-12v nature of RS232.
>
> The dip switches, two are marked on the PCB and the others are not -
> simply put those two are to address whether or not the interface should
> provide
> Data Set Ready and Data Carrier Detect to the device on the RS232 end of
> things.  The four screw terminals are obviously the loops for the teletype,
> but which ones and which polarities would be difficult to discern without
> documentation or having the circuit in hand to follow the traces back to
> their components.
>
> If you plug it in, you should see loop power on both "sides", and should
> be able to tell polarity with a multimeter, that would be a start, but
> knowing which one goes to the teletype's TX/RX pairs would be slightly
> more difficult.  You could hook it up on the RS232 side, and then send a
> string
> of repeating characters into the converter, you should notice electrical
> differences on one pair of the screw terminals while this is happening, and
> that would be your receive pair for the teletype.
>
> cheers,
> j
>
> Sarah Autumn(neverether) wrote:
> > Hey all, here are the requested photos. If you are viewing this email on
> > greenkeys, and can't see the embedded images, please follow the link here
> > to view the album.  http://imgur.com/a/Nq8Ds
> >
> > Thank you :)
> >
> > [image: Inline image 4][image: Inline image 2][image: Inline image
> 3][image:
> > Inline image 6][image: Inline image 5][image: Inline image 1]
> >
> > On Sun, Jul 26, 2015 at 11:43 AM, Robert Laag <rlaag at pacbell.net> wrote:
> >
> > > PLEASE SEND A PICTURE TO ME AS WELL...
> > >
> > >
> > >
> > >   On Sunday, July 26, 2015 8:35 AM, Sarah Autumn <neverether at gmail.com
> >
> > > wrote:
> > >
> > >
> > > Yep! I'll take some pictures today.
> > >
> > > On Sun, Jul 26, 2015 at 6:31 AM Mike Douglas <deramp5113 at yahoo.com>
> wrote:
> > >
> > > I'd be very interested in seeing pictures, including the inside. Is it
> > > actually Teletype branded?
> > >
> > > Mike
> > >
> > > > On Jul 25, 2015, at 9:46 PM, Sarah Autumn <neverether at gmail.com>
> wrote:
> > > >
> > > > Hey all,
> > > >
> > > > Does anyone happen to have a manual for the EIA-232 current interface
> > > made by Teletype? I've found manuals for other brands, but they don't
> seem
> > > applicable to this one.
> > > >
> > > > This interface doesn't seem to have a model number on it. It's a
> black,
> > > rectangular metal box, about 8" long x 5" wide by 3" deep (estimate).
> It's
> > > got 4 terminals on one end, and a DB-25 connector on the other.
> > > >
> > > > Thanks!
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