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How many wires are in rs232?

Updated: 12/23/2022
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10y ago

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The full original standard defined by the telephone company for connecting 300 baud full-duplex, 1200 baud half-duplex, asynchronous, synchronous, etc. modems to data terminals defines 25 wires. However many of these wires serve very specialized purposes or have become obsolete with improved modems.

Later the standard was modified to permit a subset of the 9 wires most frequently used by asynchronous modems: chassis ground, signal ground, transmit data, receive data, request to send, clear to send, data set ready, data terminal ready, and ring detected.

Many applications can get away with using the bare minimum of 3 wires: signal ground, transmit data, and receive data.

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Q: How many wires are in rs232?
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