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](https://media.plugable.com/images/kb/2607774/db9-pin-labels-max.png)