[GreenKeys] RS232 to current loop dongle

[Ed Sharpe Archivist for SMECC via GreenKeys]

Yes, all of these Gil!
basically the bat cave TTY box  with  some added  bells and  whistles!
most of the below  you havd  figured out   a few years  back  when  you 
built the bat cave  box.
 
 
for  museum ( ours and other sites)   the ability to have  the  press 1  
for Kennedy to die
press 2  for man to land on the moon   etc etc   feature  would be  good.  
TTY powers  up  prints and  shuts  down either at  EOM or  after a  setable  
delay  period... that  way if  you have 5 kids in a row print a  message  
it  does not have to on off on  off  in quick  succession.
 
Ed Sharpe archivist  for SMECC 
 
 
In a message dated 12/9/2014 8:32:49 A.M. US Mountain Standard Time,  
digitalham at gmail.com writes:

it is  probably a good idea to
> opto-isolate the loop keyer from the data  source (computer...) for
> safety, if it is simple  rs-232.
>
> C)  Is it a hard-wired 232 link, a USB port, or  maybe a nice wifi or
> other RF interface (not needing  isolation)?
>
> D)  Is the computer going to provide baudot  code (eg: Heavymetal, on
> limited serial port/usb-adapters) or is the  computer just providing
> ascii text and the interface box needs to do  the conversion?
>
> E)  Maybe the interface box needs to  provide relay-or-ssr-switched motor
> power when data received, and a  bit of buffering so no chars are lost?
>
> F)  Maybe a few  pushbuttons to print pre-programmed text (eg: Batcave or
> museum  application)?
>
> G)  Maybe a discoverable ethernet IOT  device so you can have world-wide
> apps talking to  it?

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