Click on a pin to see its function
| Pin Number |
Signal Name |
Description |
| 1 |
CD (Carrier Detect) |
Indicates that a connection to a modem is established (In). |
| 2 |
RxD (Receive Data) |
Receive data from the transmitting device (In). |
| 3 |
TxD (Transmit Data) |
Transmit data to the receiving device (Out). |
| 4 |
DTR (Data Terminal Ready) |
Indicates that the terminal or computer is ready to establish a connection (Out). |
| 5 |
GND (Ground) |
Ground reference voltage (-). |
| 6 |
DSR (Data Set Ready) |
Indicates that the modem or peripheral device is ready to establish a connection (In). |
| 7 |
RTS (Request to Send) |
Indicates the readiness to send data (Out). |
| 8 |
CTS (Clear to Send) |
Indicates that the receiving device is ready to accept data (In). |
| 9 |
RI (Ring Indicator) |
Indicates an incoming ring signal from a modem (In). |