[GreenKeys] Interest in a flexible USB-currentloop adapter?

[Sarah Autumn]

Interested! That sounds super neat :)
On Mon, Feb 15, 2016 at 12:00 PM <epvgk at limpoc.com> wrote:

> Hi folks -
>
> I'm trying to gauge interest in a usb-serial adapter for talking to
> teletypes.  I have
> a prototype and software, and if there's interest I can look into having a
> few made.
> This would be an alternative to the CP2102 based setup some of us are
> using.
>
> Full duplex optically-isolated 60mA loop interface that looks like a USB
> serial port
> to the computer.  does NOT include loop supply!  (may work on 20mA, but 5
> bit only)
>
> board approximately 1.5" by 2" with screw terminal blocks for loop
> connection and
> mini-USB socket for computer.
>
> Configurable from the computer - push a button on the board and it goes
> into config
> mode, where you converse with it using a serial terminal program:
>
>   * arbitrary baud rate from basically 0 to the limit of the optoisolator,
>     which is probably ~300baud.
>
>   * Either transparent passthru mode for use with HeavyMetal or BaudotRSS,
> or,
>
>   * Translation mode, which does bidirectional 5-level to ASCII
> conversion, with
>     LTRS/FIGS tracking, configurable CR/LF, auto-CR, unshift-on-space, and
> maybe
>     configurable translation tables.
>
> (or you can reflash the cpu with your own code, if you want)
>
> I'm hoping a per-unit cost of under $40 would cover parts and assembly,
> but it would
> depend on volume, etc.. I'm not hand-assembling this one, I've had enough
> of that :)
>
> eric
>
>
> PS if anyone knows of a friendly, low-overhead storefront type site to
> handle the money
> and order-taking for something like this, please let me know.
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