Name | Pin 25-pol. | Pin 9-pol. | |
Common Ground | Pin 1 | ||
TxD | Transmit Data | Pin 2 | Pin 3 |
RxD | Receive Data | Pin 3 | Pin 2 |
RTS | Request to Send | Pin 4 | Pin 7 |
CTS | Clear to Send | Pin 5 | Pin 8 |
DSR | Dataset Ready | Pin 6 | Pin 6 |
GND | Ground | Pin 7 | Pin 5 |
DCD | (Data) Carrier Detect | Pin 8 | Pin 1 |
DTR | Data Terminal Ready | Pin 20 | Pin 4 |
RI | Ring Indicator | Pin 22 | Pin 9 |
I2C:
SPI: