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How is the RS-232 interface wired?

April 26, 2017interface RS-232 wired

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How is the RS-232 interface wired?

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The RS-232 connector is a female 9-pin D-sub connector, designed to match the IBM PC/AT style serial connector. Normally, an extension cable is connected to the RS-232 end of the C2N232. Three wires are strictly needed: pins 5 (ground), 2 (transmitted data) and 3 (received data). On a 25-pin connector, these signals can be found on the pins 7, 3, and 2, respectively. The connector on the C2N232 is wired as a DCE, that is, a null modem cable must not be used.