In the early days of the personal computer, a majority of printers, hard drives and other peripheral devices communicated via a serial port. The serial port has long been a mainstay of computer technology, and is used to transmit data one bit at a time. RS232 serial connector pin assignment RS232 DB9 to DB25 converter RS232 serial loopback test plugs RS232 null modem cables Spy. However, Pin 9 has recently been reintroduced as a power supply pin to power circuity in certain displays. Male Connector Front View (DB9M) 7641 N Business Park Dr. Pin 9 was removed from 14-pin cables because the key signal became obsolete with modern computer monitors and was no longer used in the default applications of the VGA standard. If your instrument was ordered with a DB9 connection, be sure to check the Calibration Label on the device and reference the appropriate pin-out diagram. What is a 9 pin serial?Ī 9 pin serial port is a communication port and CANNOT be used for a monitor. This is the DIN connector, a member of a family of circular connectors that were initially standardized by Deutsches Institut fur Normung (DIN) for analog audio signals. DB9 Female to RJ45 Modular Adapter (RS-232 Pinout) for SeaI/O Modules : The DB109 has a DB-9 female connector that plugs directly into any standard DB-9. Since the IBM-AT, 9 pins RS232 connectors are. Frequently Asked Questions What is a 9 pin connector?ĩ pin mini-din male connector. The original pin layout for RS232 was developed for a 25 pins sub D connector. DB9 connector is widely used for serial communication RS232, RS485 and RS422 interface.

Db9 connector pin layout