[GreenKeys] 60 ma current loop to RS232 converter

[Pete Lancashire]

>From time to time on Ebay you can find Black Box 323/CL-E boxes at quite
good prices, I bought 3 new on the box
for $50 included shipping.

http://ftp.blackbox.com/manuals/C/CL051A(E)(C)%20Manaul.pdf

The spec is 20 or 60 mA. I've not tried one at 60 mA but is in the spec

-pete



On Fri, Feb 23, 2018 at 1:13 PM, Jordan Spencer Cunningham <js at cunni.co>
wrote:

> Hi Michael,
>
> *Regarding interfaces:*
>
> Are you 100% set on an RS232 interface? There are a couple recent USB <-->
> 60ma interface designs. In fact, there was a long thread on GreenKeys from
> a few days ago that discussed this in detail. I'd recommend reading it in
> the archives: http://mailman.qth.net/pipermail/greenkeys/2018-Fe
> bruary/thread.html (just search for "Computer to teletype module" to find
> all the relevant messages that were exchanged).
>
> Someone is planning to build a few of John Nagle's USB board; I'm not sure
> if all the spares have been claimed: http://mailman.qth.ne
> t/pipermail/greenkeys/2018-February/042271.html
>
> If you are set on an RS232 interface instead of via USB, it sounds like
> John Nagle designed one before designing the USB interface:
> http://www.rtty.com/greenkeys.htm. Also, someone had one of those sitting
> in a box and was willing to let go of it; it's probably been claimed by
> now, though: http://mailman.qth.net/pipermail/greenkeys/2018-Febr
> uary/042214.html. I know there are other designs based on RS-232, but I
> don't have links to them.
>
> *Regarding intercommunication methods:*
>
> I haven't yet set myself up to use ITTY, but I understood it didn't so
> much support intercommunication with other people as it did broadcasting
> things like GreenKeys messages, RSS feeds, and things of the like. (And now
> I just saw Paul's response-- I need to type faster before this entire
> message becomes redundant!)
>
> The best network to talk to a number of other individuals via teletype
> would be i-Telex as far as I know; most of those users are outside the US,
> but I know there are at least three or four US members now like Paul who
> are extremely helpful for those interested in joining on this side of the
> pond (I'm being a presumptuous Yank by assuming you're in the US as well).
>
> There are at least a couple bits of software (Heavy Metal
> <http://www.buzbee.net/heavymetal/Intro.htm> and Eric Volpe's Python
> collection <https://github.com/epvuc/loop-gateway> are the ones I know
> of) that allow for sending and receiving emails if you want to go that
> route, and Eric's Python setup also allows external TCP connections so you
> could in theory connect to other people's interfaces running the same or
> similar software and intercommunicate that way.
>
> I'm currently working on similar scripts of my own to accomplish this
> exact goal (I'm using Eric's interface design and building my scripts
> around that). I currently have a working send/receive email client and will
> be adding support for TTY to TTY communication via TCP, RSS feeds, ASCII
> art selection and printing, SSH (because who doesn't want to manage modern
> servers using a physical 5-bit terminal?), and i-Telex (if I can figure out
> the protocol enough to replicate the actual communication method-- if not,
> it can at least connect easily via a raw TCP connection). The scripts
> aren't publicly available yet, but I will share them with the list when I
> iron them out and add the functionality I mentioned.
>
> One day I'd like to try creating a directory of sorts of people who have
> TCP-capable interfaces who could intercommunicate with one another aside
> from the i-Telex network, but that is far down the line, and I just don't
> think there are very many who are set up to do that right now. My goal
> wouldn't be to replace i-Telex, of course, but rather to provide another
> channel.
>
> On Fri, Feb 23, 2018 at 1:10 PM, Michael via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
>
>> Does anyone know where to buy or how to make a 60 MA current loop to
>> RS232 converter that will power the loop needed to connect to a Model 32TT
>> and let me plug into an RS232 port on a PC? Then I can connect to the
>> HTTP://INTERNET-TTY.NET:8000/ITTY <http://internet-tty.net:8000/ITTY> and
>> talk to others by TTY, I assume....?
>>
>> Thanks,
>>
>> Mike
>>
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