9. pin connectors
   9. pin connectors are becoming increasingly common on many computers. The pins on these connectors have the same function as those on the 25-pin connector, but of course they fall in different positions. This table shows the pin-out for the 9-pin, DTE connector on the IBM PC/AT.

PIN #	FUNCTION
	Data Carrier Detect (DCD)
	Receive Data (RD)
	Transmit Data (TD)
	Data Terminal Ready (DTR)
	Signal Ground (GND)
	Data Set Ready (DSR)
	Request to Send (RTS)
	Clear to Send (CTS)
	Ring Indicator (RI)