[GreenKeys] Nagle's teletype board key part nearing end of life

[s shumaker]

I have a recently acquired (as in two weeks ago)   a CP2102N-EB that is 
cheerfully talking to itself on loopback at 110 baud  in prep for 
connecting to an ASR33.   Port selection in device properties goes as 
low as 75 baud without tinkering with the "Baud-Rate Aliasing tool".  
That may not solve your 45 baud rate problem  but the doc assertion that 
the unit won't work below 300 appears inaccurate and suggests some 
testing might be in order to see if it's unsupported but still present.....

Steve



On 3/27/2021 2:25 PM, John Nagle wrote:
> My USD to serial board, described here:
>
> https://github.com/John-Nagle/ttyloopdriver
>
> uses the SiLab CP2102 USB to serial port part.
>
> As of March 2021, the SiLabs CP2102 USB to serial part is "not 
> recommended for new designs". The "drop in replacement" CP2012N will 
> not work. It will not run at speeds below 300 baud.
>
> From SiLabs' porting guide: "Baud Rate Aliasing is a feature that 
> allows a device to use a pre-defined baud rate in place of a baud rate 
> that is requested by the user. For example, a device using Baud Rate 
> Aliasing can be programmed to use a baud rate of 45 bps whenever 300 
> bps is requested. Baud Rate Aliasing is not supported on the CP2102N. 
> If Baud Rate Aliasing is used in a CP2102/9 design, the CP2102N is 
> incompatible as a replacement."
>
> Ref: 
> https://www.silabs.com/documents/public/application-notes/an976-cp2102-3-4-9-to-cp2102n-porting-guide.pdf
>
> It's become difficult to find serial devices that will run at 45 baud.
> The CP2102 was one of the last. It's still available, so if you plan
> to build that board, stock up now.
>
>                 John Nagle
>
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