[GreenKeys] USB to TTY-loop possibility...

[Mike]

http://www.blackbox.com/Store/Detail.aspx/USB-to-RS-232-Opto-Isolator/SP385A

http://www.blackbox.com/Store/Results.aspx/Datacom/Converters/Serial/RS-232-to-Current-Loop-Interface-Converters/n-4294963723

These are the only converters that might have a connection to RTTY, and even these don't apply directly. 
This link is to an article using an Arduino to drive what appears to be a Model 15 or 19 used to print out  
Twitter messages. Unfortunately I'm currently looking at this on an iPad which won't play the video attached to 
 the article, so I can't tell how relevant it is.

http://www.nycresistor.com/2010/04/06/nycrteletype/


Mike O'Day 
N9ODM


On Nov 2, 2012, at 18:33, Raymond Cote <bluegrassdakine at hotmail.com> wrote:

> Sounds like a project. Good luck and I will keep an eye or 2 open for your update.  Seems like I have a RS232 to baudot converter made by Black box somewhere. Don't know of they are still in business so I can look up its configuration. 
> Ray
> 
> Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem. 
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> 
> On Nov 2, 2012, at 14:34, epvgk at limpoc.com wrote:
> 
>> It seems like lots of folks have been looking for an easy solution to 
>> connecting a computer to a TTY loop... There are various options like 
>> reprogramming the CP2102-based usb-serial adapters and using PC software
>> to generate the baudot code for it. 
>> 
>> I just picked up a little breakout board for an Atmel cpu (Atmega32u4)
>> which is tiny and has USB support builtin. The whole board is only like 
>> 3/4" by 1" and costs $16.  I've been playing around a bit writing software
>> to make it act as a complete USB to TTY adapter...
>> 
>> The idea is to make it look to the computer like a generic USB serial device,
>> but internally handle all the character set conversion, shifts, and framing,
>> and without a large internal buffer. So you talk to it from the computer
>> in ASCII and it ignores whatever the computer thinks about baud rate, character
>> size, etc, and produces correctly timed 7.42 code at 45.45 baud on the output
>> end, and vice versa for receiving. It only picks up a new character from 
>> the computer when it's done sending the current one to the loop, to avoid
>> having to wait for a buffer full of data to transmit once you stop sending.
>> 
>> Anyway, it's nowhere near finished but i have the sending side more or less
>> working as a proof of concept at least... if I can get it working well I'll 
>> make the software available and anybody who wants to can get one of the boards
>> and program it with my code... just thought I'd mention it in case anyone is
>> interested, and to motivate myself to make time to finish it :) 
>> 
>> eric
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