[GreenKeys] USB to TTY (model15) interface

[epvgk at limpoc.com]

Oh, also at least with older raspberry pi boards it was possible with a kernel patch against 
the "amba-pl011" driver to make the onboard serial port (which shows up as /dev/ttyAMA0) run 
at 45 baud.  That lets you use it the same way you would one of the dev kit CP210x interfaces.  

It's a bit of a pain though because you have to patch, build, and install a new kernel and 
also prevent automatic updates from overwriting it.   I have one working this way for a while
now but I haven't tried it with a more recent raspberry pi board, which may have different
onboard serial hardware, or none at all for all I know. 

eric



On Thu, Feb 09, 2023 at 09:26:15AM -0700, Paul Heller wrote:
>    Nice!
> 
>    Paul
>    W2TTY
> 
>      On Feb 9, 2023, at 9:12 AM, ad7i <ad7i at ad7i.net> wrote:
> 
> 
>      This is the serial port that I have installed in my PC.  I haven't tried
>      it at 45 bps but I think it will work.
>      https://www.amazon.com/gp/product/B07PZLF43K
>      Alternatively, an Arduino can take in ASCII serial over the USB port (at
>      1200 and up) and output it as Baudot at 60/66/74/100 WPM via TTL or
>      AFSK.  See http://ad7i.net/main/projects/tty/jack-knife/ for an example
>      of that.
>      Paul, ad7i
>      On Thu, Feb 9, 2023 at 11:04 AM Eric Moore <mooreericnyc at gmail.com>
>      wrote:
> 
>        PL2301 based adapters can do 110 baud, I have not tried 45 but they
>        should work.
>        https://www.amazon.com/DriverGenius-4XRS232-Industrial-Serial-Adapter/
>        This is a four port adapter that uses the PL2301 chip. Bit pricey, but
>        if you have multiple serial devices, worth the money.
>        -Eric
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