[GreenKeys] Current Loop to RS232 with baud rate and character conversion

Thu Aug 13 15:19:36 EDT 2015

YEA!!!!!!!  Very good  Gil. This is AWESOME!!  the   auto motor   is  well 
needed  when used in museum demo   application.

Maybe  add   20 or 60 mil option?  or you probably  already  have.    that  
was  a   33/   or   a  15   2 different  loop  currents.

what is  the  ETA!?

Ed#   _www.smecc.org_ (http://www.smecc.org)  

In a message dated 8/13/2015 9:49:42 A.M. US Mountain Standard Time,  
gil at baudot.net writes:

Hi Mike:

I am actually designing a new unit (which I have not officially  announced, 
but hinted at).  So let me give a quick overview.

- wifi (optionally bluetooth) interface, so no cable to the  
computer/tablet/phone
- 2 separate loops (maybe 4 as an option)
- loops can be set to 60/66/75/100-wpm baudot or 110/300-baud ascii
- one loop can be logically connected to another to convert speeds  between 
machines
- all the speed conversion and ascii/baudot conversion is done  
automatically

- auto motor powering

- SD card to store files you want to print as demos (jfk news reports,  
whatever)
- open source so you can tweak it as you like

- current prototype is using a teensy 3.1 (may change, but it is  awesome)

This is an evolution of my old TTY-CONNECT design from a decade  ago.  I 
also plan to have an adapter for folks would built one of those  up and want 
to use the loop sections.

fwiw, gil

gil smith, AF7EZ
greenkeys moderator
_gil at baudot.net_ (mailto:gil at baudot.net) 

-------- Original Message --------
Subject:  [GreenKeys] Current Loop to RS232 with baud rate and  character
conversion
From: Mike Willegal <_mike at willegal.net_ (mailto:mike at willegal.net) >
Date: Thu,  August 13, 2015 4:59 am
To: _greenkeys at mailman.qth.net_ (mailto:greenkeys at mailman.qth.net) 

Hi,

I’m  thinking of building a small micro-controller based dongle that will 
convert  from current loop to RS232 and also capture data and retransmit at a 
baud  rate and character encoding more acceptable to current generation 
PCs. So it  would:
convert current loop to RS232
convert baud rate from 45 or 110  to 9600 or 19200
optionally convert BAUDOT to ASCII

I think, with  this dongle, any modern generation PC with a basic terminal 
program and  RS232 dongle could probably be used as a substitute teletype.

Before  I invest any energy in such a project, does anyone know of anything 
already  out there that does this?
Are there any good descriptions of a general  purpose current loop to RS232 
floating around? I would preferably want to  support both 20 ma and 60 ma 
current loop.

regards,
Mike  Willegal
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