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Near the TTL character is the TTL level, near to RS232 is RS232 level. RS232 to TTL converter board for electrical levels. For a LOT You will receive Chip Model: MAX3232CSE.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.