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DB9 pinout and signals for the PC RS232 connector (serial and RS232 ports)

DB9 pin D-SUB male

DB9 pin D-SUB male

Pin	Name	Direction	Description
1	CD	«—	Carrier Detect
2	RXD	«—	Receive Data
3	TXD	—»	Transmit Data
4	DTR	—»	Data Terminal Ready
5	GND		System Ground
6	DSR	«—	Data Set Ready
7	RTS	—»	Request to Send
8	CTS	«—	Clear to Send
9	RI	«—	Ring Indicator

Note: Direction is DTE (Computer) relative DCE (Modem).

RS232 pinout and signals
Serial port pinout and signals
Full DB25 serial (RS232) port pinout and signals
DB25 pinout and signals