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:
