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2. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   A DB-25 connector as described in the RS-232 standard Data circuit-terminating equipment (DCE) and data terminal equipment (DTE) network. In telecommunications, RS-232 or Recommended Standard 232 [1] is a standard originally introduced in 1960 [2] for serial communication transmission of data.

3. Serial port - Wikipedia

   en.wikipedia.org/wiki/Serial_port

   A male DE-9 connector on an IBM PC compatible computer (with serial port symbol) used for an RS-232 serial port A female DE-9 connector on an RS-232 cable.. A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. [1]

4. Serial cable - Wikipedia

   en.wikipedia.org/wiki/Serial_cable

   Serial cables are typically used for RS-232 communication. A serial cable or RS-232 cable is a cable used to transfer information between two devices using a serial communication protocol. The form of connectors depends on the particular serial port used. A cable wired for connecting two DTEs directly is known as a null modem cable.

5. D-subminiature - Wikipedia

   en.wikipedia.org/wiki/D-subminiature

   The widest application of D-subs is for RS-232 serial communications, though the standard did not make this connector mandatory. RS-232 devices originally used the DB-25, but for many applications the less common signals were omitted, allowing a DE-9 to be used.

6. Modular connector - Wikipedia

   en.wikipedia.org/wiki/Modular_connector

   The EIA/TIA-561 standard describes the use of 8P8C connectors for RS-232 serial interfaces. [23] This application is common as a console interface for network equipment, such as switches, routers, and headless computers. 8P8C modular connectors are also commonly used as a microphone connectors for PMR, LMR, and amateur radio transceivers ...

7. Null modem - Wikipedia

   en.wikipedia.org/wiki/Null_modem

   A null modem adapter. 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 or two modems in order to communicate with one another; null modem communication refers to using a crossed-over RS-232 cable to connect the teleprinters ...