[GreenKeys] A reliable current-loop-to-RS232 converter

[Ed Sharpe Archivist for SMECC via GreenKeys]

Cool!  I bought  a few  for me and a few  for  Gil  to experiment  with.
 
 
In a message dated 8/15/2015 7:11:04 P.M. US Mountain Standard Time,  
rmowery28146 at earthlink.net writes:

For $ 1.99 you can get them already on a circuit board  ready to hook the 
wires to from China off ebay.  Lots of ones similar to  this one.
231267556341
 
 
 

----- Original Message ----- 
From:  _drlegendre ._ (mailto:drlegendre at gmail.com)  
To: _teletypeparts at comcast.net_ (mailto:teletypeparts at comcast.net)  
Cc: _Egan,  Gabriel_ (mailto:mail at gabrielegan.com)  ; _GREENKEYS BULLETIN 
BOARD_ (mailto:greenkeys at mailman.qth.net)  
Sent: Saturday, August 15, 2015 7:02  PM
Subject: Re: [GreenKeys] A reliable  current-loop-to-RS232 converter


To convert the TTL level RS-232 signals to a proper bi-polar  signal, you 
only need a MAX232 chip (or clone) and 4x 1uF @ 16V capacitors.  The MAX232 
directly converts back and forth between 5V TTL and the more  correct +/-12V  
signaling.   


Easy as pie, and the chips are like a buck or something. Let me know if  
you need one, I have a couple spares. 






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