Null modem

（重定向自Null modem cable）

Wiring pinouts for DB-25 (left) and DE-9 (right) connectors

Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable. The name stems from the historical use of RS-232 cables to connect two teleprinter devices to two modems in order to communicate with one another; null modem communication was possible by using a crossed-over RS-232 cable instead to connect the teleprinters directly to one another.

单词	Null modem cable
释义	Null modem cable 英语百科 Null modem （重定向自Null modem cable） Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable. The name stems from the historical use of RS-232 cables to connect two teleprinter devices to two modems in order to communicate with one another; null modem communication was possible by using a crossed-over RS-232 cable instead to connect the teleprinters directly to one another.
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