Null Modem Cables
Null modem cables are used as a communication method to directly connect two computers, terminals, or a serial printer using an RS-232 serial cable. The name stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems in order to communicate with one another. Null modem communications refer to using a crossed-over RS-232 cable with two computers to connect directly to one another without modems. It is also is used to connect a computer to a serial printer. There are numerous other industrial equipment uses for this type of cable.
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