What is the pinout of the RS-232 connector?

Last Update: June 7th, 2024
Article ID: 2607774

The RS-232 connector on PL2303-DB9 uses a standard DTE pinout. The pin configuration is as follows:

Pin 1 DCD
Pin 2 RX
Pin 3 TX
Pin 4 DTR
Pin 5 GND
Pin 6 DSR
Pin 7 RTS
Pin 8 CTS
Pin 9 RI

The pin numbering can be found inside the DB9 connector of the adapter, and is as follows:


RS232 DB9 Labelled Pins