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Male pinout of a 25-pin serial port (D-subminiature, DB-25) commonly found on 1980s computers. The following table lists commonly used RS-232 signals (called "circuits" in the specifications) and their pin assignments on the recommended DB-25 connectors [14] (see Serial port pinouts for other commonly used connectors not defined by the standard).
(A few early original PlayStation models featured RCA outs for composite video and stereo analog audio in addition to the AV Multi connector.) 35-pin MicroCross Molex connector VESA Enhanced Video Connector and VESA Plug and Display (a.k.a. M1-DA) both used this connector with slightly different pin assignments. These schemes combined VGA or ...
The only connector specified in the original RS-232 standard was the 25-pin D-subminiature, however, many other connectors have been used to save money or save on physical space, among other reasons. In particular, since many devices do not use all of the 20 signals that are defined by the standard, connectors with fewer pins are often used.
The serial DCD pin can be used to accurately detect a PPS signal, as described in RFC 2783: [1] One convenient means to provide a PPS signal to a computer system is to connect that signal to a modem-control pin on a serial-line interface to the computer. The Data Carrier Detect (DCD) pin is frequently used for this purpose.
Aston Martin DB9, a grand tourer made by Aston Martin; Darren Bent, English football forward who wears the number 9 shirt for Aston Villa F.C. DB9 (yacht), a superyacht built by Palmer Johnson in 2010; DE-9 connector, a common type of D-subminiature electrical connector, widely referred to as "DB-9" even though that is a different sized connector.
These other standards would define protocols, connectors, pin assignments and functions. Standards such as EIA-530 ( DB-25 connector) and EIA-449 ( DC-37 connector) use RS-422 electrical signals. Some RS-422 devices have 4 screw terminals for pairs of wire, with one pair used for data in each direction.
Calling that shield a shell (or D-shell) can be ambiguous, as the term shell is also short for the cable shell, or backshell. D-sub connectors have gender: parts with pin contacts are called male connectors or plugs, while those with socket contacts are called female connectors or sockets. The socket's shield fits tightly inside the plug's shield.