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

[Andreas Müller]

Hi all,

as you are talking about Digi, I want to mention that I use an Digi Portserver 
TS 8 for TTY/RTTY. It works fine down to 50 Baud, I did not try 45,45 Baud yet 
because I don't have any other equipment which works on this speed (except my 
UGC-74 without the proper cables). The 5bit-converson is done by the software. 
Using a Portserver has the advantage that I can make the TTY run from any 
location where I have an ethernet connection in our house to plug in my laptop 
computer.

Regards
Andreas, DD1LM.

Am Dienstag, 11. März 2014, 04:02:28 schrieb 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. :)