[GreenKeys] Usb adapter

[ad7i]

 I'm not sure what others would be interested in the way of features, if
such a device was to be created, but I was thinking about the following:

Computer to TTY: USB at standard serial speeds of 2400 to 9600 bps.
Ideally with XonXoff flow control and RTS/CTS flow control for the
downstream path (however, there are windows driver issues with flow control
on USB<->Serial devices).

Downstream and upstream functions are full duplex.

Downstream functions:

   - Convert ASCII to 5 unit Baudot/Murray codes: ITA#2, US MIL, others?
   - TTY output speeds of 60, 66, 75 and 100 WPM.
   - Convert ASCII LF to Baudot CR CR LF, ignore ASCII CR
   - Binary Mark/Space output that can open/close HV 60mA loop circuit,
   polarity independent
   - Hi Tone AFSK Mark/Space output (to drive TU in those cases where
   someone wants to use or demo a TU with their TTY).

Upstream Functions:

   - Binary Mark/Space current sense input of HV 60 mA loop circuit,
   polarity independent
   - TTY input speeds of 60, 66, 75 and 100 WPM.
   - Convert Baudot/Murray codes (ITA#2, US MIL, others?) to ASCI


Also could do a motor control.  Start motor when characters are in
downstream queue (with 2 second startup char output delay for the motor to
stabilize) and then motor off when no characters are in downstream queue
for more than 10 seconds (or whatever time is wanted).

Assuming the printer has sensors for paper out and paper jam, it might be
possible to include an AnswerBack function, if that might be useful.

Paul, ad7i

On Fri, Dec 10, 2021 at 2:09 PM ad7i <ad7i at ad7i.net> wrote:

> I don't have exactly what you are describing, but I've been doing a lot of
> PCBoard layouts for things that include USB to serial converters and
> microcontrollers. My most recent task is an electronic selector magnet
> driver (meaning it doesn't have a high voltage loop per se, but instead
> uses lower voltages (and small limiting resistors) to get the magnetic flux
> up to full value in a couple of milliseconds).
>
> If Greenkers were willing to come up with a set of requirements (fewer is
> better than more) I think I should be able to come up with a simple PC
> Board that functions as a USB to HV Loop interface with ASCII to BAUDOT
> conversion included.  PC Boards fabricated in China are surprisingly
> inexpensive.
>
> Paul, ad7i
>
>
> On Fri, Dec 10, 2021 at 1:39 PM chris johnson <archangel_cpj at hotmail.com>
> wrote:
>
>> Anyone making a batch of adaptors for usb to model 15 use????  Or have
>> any already made for sale????
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