Ampro Corporation 5001692A manual Pin # Signal DB9 # Description

Chapter 3				Hardware
Table 3-12. Serial Ports Pin/Signal Descriptions (J3, J9)
	Pin #	Signal	DB9 #	Description
	1	DCD*	1	Data Carrier Detect – Indicator to the serial port that external modem is
				detecting a carrier signal (i.e., a communication channel is currently
				open). In direct connect environments, this input will be driven by DTR
				as part of the DTR/DSR handshake.
	2	DSR*	6	Data Set Ready – Indicator to the serial port that external serial
				communications device is powered, initialized, and ready. Used as
				hardware handshake with DTR1 for overall readiness to communicate.
	3	RXD	2	Receive Data – Serial port receive data input is typically held at a logic
				1 (mark) when no data is being transmitted, and is held “Off” for a brief
				interval after an “On” to “Off” transition on the RTS line to allow the
		RX Data –		transmission to complete.
				Serial Port 1 or 2 – If in RS485 mode, this pin is RX Data –.
	4	RTS*	7	Request To Send – Indicates serial port is ready to transmit data. Used
		Tx Data +		as hardware handshake with CTS for low level flow control.
				Serial Port 1 or 2 – If in RS485 mode, this pin is TX Data +.
	5	TXD	3	Transmit Data – Serial port transmit data output is typically held to a
				logic 1 when no data is being sent. Typically, a logic 0 (On) must be
				present on RTS, CTS, DSR, and DTR before data can be transmitted on
		Tx Data –		this line.
				Serial Port 1 or 2 – If in RS485 mode, this pin is TX Data –.
	6	CTS*	8	Clear To Send – Indicator to the serial port that external serial
				communication device is ready to receive data. Used as hardware
		Rx Data +		handshake with RTS for low level flow control.
				Serial Port 1 or 2 – If in RS485 mode, this pin is RX Data +.
	7	DTR*	4	Data Terminal Ready – Indicates serial port is powered, initialized, and
				ready. Used as hardware handshake with DSR for overall readiness to
				communicate.
	8	RI*	9	Ring Indicator – Indicator to serial port that external modem is detecting
				a ring condition. Used by software to initiate operations to answer and
				open the communications channel.
	9	GND	5	Digital Ground
	10	KEY/NC	NC	Key Pin/Not connected

Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.

Table 3-13. Serial 3 & 4 Interface Pins/Signals (J13, J14)

Pin #	Signal	DB9 #	Description
1	DCD*	1	Data Carrier Detect – Indicator to serial port that external modem is
			detecting a carrier signal (i.e., a communication channel is currently
			open). In direct connect environments, this input will be driven by DTR
			as part of the DTR/DSR handshake.
2	DSR*	6	Data Set Ready – Indicator to serial port that external serial
			communications device is powered, initialized, and ready. Used as
			hardware handshake with DTR for overall readiness to communicate.
3	RXD	2	Receive Data – Serial port receive data input is typically held at a logic
			1 (mark) when no data is being transmitted, and is held “Off” for a brief
			interval after an “On” to “Off” transition on the RTS line to allow the
			transmission to complete.

34 Reference Manual CoreModule 420