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

[Mail@studio8h.com]

Eric -
Count me in for your proposed adapter -  2 of them.
Sorely needed.
Thanks.

Dan Beach
KD4WLI




Message: 8
Date: Mon, 15 Feb 2016 11:59:51 -0800
From: epvgk at limpoc.com
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Interest in a flexible USB-currentloop adapter?
Message-ID: <20160215195951.GA25827 at limpoc.com>
Content-Type: text/plain; charset=us-ascii

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

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