Pin                             #   |                            Mnemonic   |                            Full name   |                         
1  |                           CD  |                           Carrier Detect  |                         
2  |                           RCD  |                           Receive Data  |                         
3  |                           TXD  |                           Transmit Data  |                         
4  |                           DTR  |                           Data Terminal Ready  |                         
5  |                           GND  |                           Ground  |                         
6  |                           DSR  |                           Data Set Ready  |                         
7  |                           RTS  |                           Request To Send  |                         
8  |                           CTS  |                           Clear To Send  |                         
9  |                           RI  |                           Ring Indicator  | 
| 9 Pin Connector on a DTE device (PC connection) | |
| Male RS232 DB9 | |
| Pin Number | Direction of signal: | 
| 1 | Carrier Detect (CD) (from DCE) Incoming signal from a modem | 
| 2 | Received Data (RD) Incoming Data from a DCE | 
| 3 | Transmitted Data (TD) Outgoing Data to a DCE | 
| 4 | Data Terminal Ready (DTR) Outgoing handshaking signal | 
| 5 | Signal Ground Common reference voltage | 
| 6 | Data Set Ready (DSR) Incoming handshaking signal | 
| 7 | Request To Send (RTS) Outgoing flow control signal | 
| 8 | Clear To Send (CTS) Incoming flow control signal | 
| 9 | Ring Indicator (RI) (from DCE) Incoming signal from a modem | 
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