The following table shows the pins in DB9 (RS232) connector with names and DTE and DCR signal directions PIN No. Pin Description of DB-9 Connector (RS232) It is known as DE -9 which is a D –Type subminiature connector. ![]() Therefore, a much decreased function of 9-pin connector is in use mostly. With technological advances and devices getting smaller in size, there isn’t any space for huge connector like DB25, and most of applications doesn’t require the need of connecting all the 25 pins. These function according to their direction in communication, signal types and with a variation of pins. There are three kinds of signals in RS232, i.e data, control and ground. With the help of a DB25 Connector, the DTE object requires a female outer casing along with male whereas the DCE device uses a male outer casing with the female pins. RS232 – DB9 Male and Female Connector Pinout The RS232 standard strongly implies to provide a 23 – pin and D – Type connector in order to support the entire functional utility of RS232. The mechanical identifications of RS232 includes the mechanical alliance of the standard.
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