RS-232 signals

Many of the signals defined by the RS-232 standard are rarely used. This table lists the signals that are important for the present purposes.

PIN #	FUNCTION	DIRECTION DTE/DCE
	Frame Ground
	Transmit Data (TxD)
	Receive Data (RxD)
	Request to Send (RTS)
	Clear to Send (CTS)
	Data Set Ready (DSR)
	Signal Ground (GND)
	Data Carrier Detect (DCD)
20	Data Terminal Ready (DTR)
22	Ring Indicator (RI)