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RS232 Pinout

Below is the pinout of a typical standard male 9-pin RS232 connector, this connector type is also referred to as a DB9 connector.
A computer's serial COM port (DTE) is usually a male port as shown below, and any peripheral devices you connect to this port usually has a female connector (DCE).

RS232 Pinout

This table shows the pin numbers with signal names and the signal direction.

Pin Signal Signal Name DTE Signal direction
1 DCD Data Carrier Detect In
2 RXD Receive Data In
3 TXD Transmit Data Out
4 DTR Data Terminal Ready Out
5 GND Ground -
6 DSR Data Set Ready In
7 RTS Request to Send Out
8 CTS Clear to Send In
9 RI Ring Indicator In