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UNIX System Administration Handbook, Third Edition by Trent R. Hein, Evi Nemeth, Garth Snyder, Scott Seebass

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7.1 SERIAL STANDARDS

Most serial ports obey some variant of the standard known as RS-232. This standard specifies the electrical characteristics and meaning of each signal wire, as well as pin assignments on the traditional 25-pin (DB-25) serial connector shown in Exhibit A.

Exhibit A A male DB-25 connector

image

Full RS-2321 is overkill for all real-world situations, as it defines numerous signals that are unnecessary for basic communication. DB-25 connectors are also inappropriately large for use on patch panels and laptop computers. As a result, a number of alternative connectors have come into widespread use. These are described in the section ...

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