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Comprehensive DB-25 wiring diagrams: Tascam, Apple, SCSI, etc. "Pinouts by Connector". Pinouts. A list of common computer connectors, including most D-sub. "9 pin D-SUB female connector diagram and applications". Pinouts. Archived from the original on 2007-09-01 Devices with DE-9 connectors. "D-sub 9 Connector Pinout".
For example, on the original IBM PC, a male D-sub was an RS-232-C DTE port (with a non-standard current loop interface on reserved pins), but the female D-sub connector on the same PC model was used for the parallel "Centronics" printer port. Some personal computers put non-standard voltages or signals on some pins of their serial ports.
A Cisco rollover cable using the 8P8C Yost standard. 8P8C connectors are also used in many devices. The EIA/TIA-561 standard defines a pinout using this connector, while the rollover cable (or Yost standard) is commonly used on Unix computers and network devices, such as equipment from Cisco Systems. [7]
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.
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 ...
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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.
It gets the name rollover because the pinouts on one end are reversed from the other, as if the flat cable had been rolled over. This cabling system was invented to eliminate the differences in RS-232 wiring systems. Any two RS-232 systems can be directly connected by a standard rollover cable and a standard connector.