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DB-9 Connector Pinout

Pin Signal Direction Description
1 DCD IN Carrier Detect
2 RXD IN Receive Data
3 TXD OUT Transmit Data
4 DTR OUT Data Terminal Ready
5 GND - Signal Ground
6 DSR IN Data Set Ready
7 RTS OUT Request To Send
8 CTS IN Clear To Send
9 RI IN Ring Indicator