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

[Ralph Mowery]

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 . 
  To: teletypeparts at comcast.net 
  Cc: Egan, Gabriel ; GREENKEYS BULLETIN BOARD 
  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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