No PC interface has attracted more attention in the electronics
press, and caused hotter debates, than the RS-232 interface. It is
unfortunate but true that both hardware and software appear to be
open to different interpretations when it comes to connecting
RS-232 devices like printers, plotters, mice and modems. The tester
described here is a handy tool to help you locate possible hardware
errors, when hooking up a new RS-232 peripheral is not going as
smoothly as you would have hoped.
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