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B-8 Appendix B—Serial Interface
MAKING A SERIAL CABLE
Interfacing two RS-232-C serial devices is simply a process of connecting
grounds and tying together the output and input signal pairs.
The wiring diagrams on Page B-10 list the nine most commonly used RS-
232-C serial interface signals and their pins versus the pin assignments
on DCE and DTE devices. Most computers are DTE devices. Most
modems, repeaters, and translators are DCE.
Connections that are usually required appear as solid lines. Connections
that are normally optional appear as dashed lines. The full compliment of
connections is sufficient for the majority of situations. For special cases,
consult your device's technical reference manual.
Serial connectors come in two genders: male and female. A female
connector is mounted on the printer. Use a male connector on the printer
end of the cable.