A helpful reader of my articles, John R. Mortarelli, sent me a message on how to build a low-cost TTL-to-RS232 level shifter:
"For those with a little electronic circuit board know how, here are a couple of webpages that show how to construct for low cost ($5) a TTL - to - RS232 level shifter. http://www.zero-soft.com/HW/RS232/ and [PDF] RS232/DB9 An RS232 to TTL Level Converter ".
Thanks, John!
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