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2. Serial port - Wikipedia

   en.wikipedia.org/wiki/Serial_port

   The 9-pin DE-9 connector has been used by most IBM-compatible PCs since the Serial/Parallel Adapter option for the PC-AT, where the 9-pin connector allowed a serial and parallel port to fit on the same card. [4] This connector has been standardized for RS-232 as TIA-574.

3. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   In the book PC 97 Hardware Design Guide, [9] Microsoft deprecated support for the RS-232 compatible serial port of the original IBM PC design. Today, RS-232 has mostly been replaced in personal computers by USB for local communications. Advantages compared to RS-232 are that USB is faster, uses lower voltages, and has connectors that are ...

4. 9-Pin Protocol - Wikipedia

   en.wikipedia.org/wiki/9-Pin_Protocol

   It uses an DE-9 D-Sub connector with 9 pins (hence the name), where bi-directional communication takes place over a four wire cable according to the RS-422 standard. While nowadays all post-production editing is done with a non-linear editing system, in those days editing was done linearly, using online editing. Editing machines relied heavily ...

5. D-subminiature - Wikipedia

   en.wikipedia.org/wiki/D-subminiature

   Because personal computers first used DB-25 connectors for their serial and parallel ports, when the PC serial port began to use 9-pin connectors, they were often labeled as DB-9 instead of DE-9 connectors, due to an ignorance of the fact that B represented a shell size. It is now common to see DE-9 connectors sold as DB-9 connectors.

6. File:MiniDIN-9 Diagram.svg - Wikipedia

   en.wikipedia.org/wiki/File:MiniDIN-9_Diagram.svg

   A diagram of the 9 pin Mini-DIN connector. Date: 1 June 2006 (original upload date) Source: No machine-readable source provided. Own work assumed (based on copyright claims). Author: No machine-readable author provided. Mobius assumed (based on copyright claims).

7. 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.

8. COM (hardware interface) - Wikipedia

   en.wikipedia.org/wiki/COM_(hardware_interface)

   COM port (DE-9 connector). COM (communication port) [ 1 ] [ 2 ] is the original, yet still common, name of the serial port interface on PC-compatible computers . It can refer not only to physical ports, but also to emulated ports, such as ports created by Bluetooth or USB adapters .

9. RS-422 - Wikipedia

   en.wikipedia.org/wiki/RS-422

   This was implemented in a multi-pin connector that had enough pins to support the majority of the common RS-232 pins; the first models used a 9-pin D connector, but this was quickly replaced by a mini-DIN-8 connector. The ports could be put into either RS-232 or RS-422 mode, which changes the behavior of some of the pins while turning others on ...