You might be aware of this out there too, and you might need to be open to a fairly easy solder project if you have a M15… But, a neat little something to think about putting in the future-proofing pocket, especially for newbies like me. About the size of a deck of cards when it’s built. 

I use a USB to rs232 cable with the below project and Mike sells his chips to run at 9600 baud 8N1 (so there is the future proofing), the box converts to 45.5 baudot with a buffer and hardware handshake to throttle the computer/modem side.   

Has some other configurable details too like Baudot pass through if you don’t want to run ASCII 8N1, you can still run the computer side at 9600 in baudot.

I built the model 15 version and even made some external adaptations to run my 15 printer with a 28 TD and Reperf in my shack.  

I have the greenkeys auto start feed coming AFSK on a raspberry pi into this project also.  AFSK is just for ITTY, he doesn’t guarantee it would work well or at all with the noise from a radio.   So not a full TU, but it’s pretty darn useful plugged into one that does serial.

Deramp.com- below is the direct link to click for those getting this message on their modern devices.
 
Teletype RS-232 Adapter
deramp.com
computer-turned-on-32-288937-32x32-1.png

 
Anthony

On Mar 11, 2024, at 11:42 AM, Paul Heller <[email protected]> wrote:

Thanks for the update. I have a bunch of those Chinese knockoffs. I got tired of trying. It’s good to know that you found something that would work.


Paul
W2TTY

On Mar 11, 2024, at 6:45 PM, Paul Wills (CKT&T) <[email protected]> wrote:

Greetings,

As Windows 10 is rapidly reaching end of support, I started thinking about how I would replace my desktop.  Unfortunately, nothing comes with a serial port and if anything does, it's probably not the same UART as found in an older PC.

I knew about the Silicon Laboratories CP2102 and actually bought a couple of their development kits.  The CP2102 allows a user to set an "alias" baud rate that can go as low as 45 baud. Unfortunately, the development kits are a bit costly at more than $40 per unit.

I did a lot of Google searching and tried a few USB to serial adapters made for the hobby market.  Unfortunately, most of the "CP2102" UARTs appear to be Chinese knock-offs that mostly act like the Silabs units but they don't support 45 baud.

Eventually, I came across Pololu Robotics who actually carries a USB to TTL adapter with the "real" Silabs* chip.  At $15 each, I bought four of them just to make sure I had a couple spares as the CP2102 is being discontinued and replaced with the CP2102N which does not support 45 baud.  They worked so well, I might buy a few more.

https://www.pololu.com/product/391

One needs the CP210xBaudRateAliasConfig.exe program to change the baud rate.  Silabs also has a configuration program that is supposed to change the baud rate but I couldn't get it to work. They don't currently make CP210xBaudRateAliasConfig available but I can provide it for those who need it.

Right now, there are 119 in stock.  I wouldn't bet that they would make any more.

I have nothing to with Pololu Robotics other than being a satisfied customer.

PDW

*I think they were actually insulted when I mentioned the knock-off chips because they proudly said that their converters are made in the USA with parts sourced from the proper manufacturers.

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Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]

Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]