New Page 1

Table 1 : D Type 9 Pin and D Type 25 Pin Connectors

Abbreviation		Full Name	Function
	TD	Transmit Data	Serial Data Output (TXD)
	RD	Receive Data	Serial Data Input (RXD)
	CTS	Clear to Send	This line indicates that the Modem is ready to exchange data.
	DCD	Data Carrier Detect	When the modem detects a "Carrier" from the modem at the other end of the phone line, this Line becomes active.
	DSR	Data Set Ready	This tells the UART that the modem is ready to establish a link.
	DTR	Data Terminal Ready	This is the opposite to DSR. This tells the Modem that the UART is ready to link.
	RTS	Request To Send	This line informs the Modem that the UART is ready to exchange data.
	RI	Ring Indicator	Goes active when modem detects a ringing signal from the PSTN.