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Karen O · 30th Mar 2019, 12:56 am

I think you're right, JohnBH. Every RS232 receiver I've ever used sliced the signal at +1.5V or thereabouts. That's a better noise margin than a TTL input for an HCMOS source!

30th Mar 2019, 12:56 am	#15
Karen O Rest in Peace Join Date: Jul 2011 Location: Bridgnorth, Shropshire, UK. Posts: 787	Re: Mk14 programming I think you're right, JohnBH. Every RS232 receiver I've ever used sliced the signal at +1.5V or thereabouts. That's a better noise margin than a TTL input for an HCMOS source!