[GreenKeys] 45, 50 ...etc. baud serial baudot interface for PC?

[Rich Armstrong]

On Mon, 10 Mar 2014 20:12:38 -0400, you wrote:

>On 10-Mar-14 18:32, Dave wrote:
>> On 10/03/2014 16:47, Jim Haynes wrote:
>>> The older COM ports built into machines, or on add-in cards, go down to
>>> 45 baud.  My understanding is that most of the recent USB-to-RS-232 port
>>> devices will not go down to 45 baud.  And I don't know how, with recent
>>> versions of Windows, you can get 45 baud even with hardware that will do
>>> it.
>> the MODE command still allows you to set 50 Baud... I don't have a 
>> serial port on this PC but the RTTYArt program from here:-
>>
>> http://www.k7tty.com/development/software/index.html
>>
>> downloads and runs on Windows/7 64-bit...
>
>If you have a  computer with a serial port, 45 baud is not a problem, 
>but very few models have serial ports anymore.  (I don't think the MODE 
>command works on USB??)
>
>The problem comes from trying to convert from USB to serial.  Most USB 
>to serial converters will not go slow enough for TTY.  Someone on the 
>list was talking about programing a small CPU board for the USB to 
>serial conversion.  I wonder if he got anywhere with it??
>
>Duncan
>
On the off chance someone might find the information useful, Digi
makes some USB to DB-9 serial port converters that will do 45 baud. In
particular I have a couple of Edgeport/1 USB serial port converters
and a Edgeport/8, (8 serial ports!), hooked up to a Windows 7 64 bit
laptop that are configured for 45, 5, 1 1/2, talking to LRB43
reperforators through serial to loop current converters. (I use loop
converters built from Express PCB board files and schematics described
at http://aetherltd.com/connecting.html). They work just fine at 110
baud as well.

The Digi USB serial ports won't do ASCII to Baudot or vice versa, so
whatever software you're using to talk to the serial port has to do
that. My software is a custom Windows program, so I'm not sure how the
serial ports would look to a DOS-boxed program...

The Digi converters are sorta pricy new, but you can usually get them
much more reasonably on eBay, especially if you're willing to be a
little patient.

I don't own any Digi stock nor am I affiliated with the neat folks at
aetherltd.com. :)

-- 
Rich