Ampro Corporation Littleboard 550 DCD1, DSR1, RXD1, RTS1, TXD1, CTS1, DTR1, Key, DCD2, DSR2, RXD2

Chapter 3 Hardware

Table 3-14. Serial A Interface Pin/Signal Descriptions (J11)

Pin #	Pin #	Signal	Description
	DB9
1	1	DCD1*	Data Carrier Detect 1 – Indicates external serial communications device
	(COM1)		is detecting a carrier signal (i.e., a communication channel is currently
			open). In direct connect environments, this input will be driven by DTR1
			as part of the DTR/DSR handshake.
2	6	DSR1*	Data Set Ready 1 – Indicates external serial communications device is
			powered, initialized, and ready. Used as hardware handshake with DTR1
			for overall readiness to communicate.
3	2	RXD1	Receive Data 1 – Serial port 1 receive data in.
		RX1-	RX1- – If in RS485 or RS422 mode, this pin is Receive Data 1 -.
4	7	RTS1*	Request To Send 1 – Indicates Serial port 1 is ready to transmit data.
			Used as hardware handshake with CTS1 for low level flow control..
		TX1+	TX1+ – If in RS485 or RS422 mode, this pin is Transmit Data 1 +.
5	3	TXD1	Transmit Data 1 – Serial port 1 transmit data out.
		TX1-	TX1- – If in RS485 or RS422 mode, this pin is Transmit Data 1 -.
6	8	CTS1*	Clear To Send 1 – Indicates external serial communications device is
			ready to receive data. Used as hardware handshake with RTS1 for low
			level flow control.
		RX1+	RX1+ – If in RS485 or RS422 mode, this pin is Receive Data 1 -.
7	4	DTR1*	Data Terminal Ready 1 – Indicates Serial port 1 is powered, initialized,
			and ready. Used as hardware handshake with DSR1 for overall readiness
			to communicate.
8	9	RI1*	Ring Indicator 1 – Indicates external serial communications device is
			detecting a ring condition. Used by software to initiate operations to
			answer and open the communications channel.
9	5	GND	Ground
10	NC	KEY/	Key
		NC	Not connected
11	1	DCD2*	Data Carrier Detect 2 – Indicates external serial communications device
	(COM2)		is detecting a carrier signal (i.e., a communication channel is currently
			open). In direct connect environments, this input will be driven by DTR2
			as part of the DTR/DSR handshake.
12	6	DSR2*	Data Set Ready 2 – Indicates external serial communications device is
			powered, initialized, and ready. Used as hardware handshake with DTR2
			for overall readiness to communicate.
13	2	RXD2	Receive Data 2 – Serial port 2 receive data in
		RX2-	RX1- – If in RS485 or RS422 mode, this pin is Receive Data 2 -.
14	7	RTS2*	Request To Send 2 – Indicates Serial port 2 is ready to transmit data.
			Used as hardware handshake with CTS2 for low level flow control.
		TX2+	TX2+ – If in RS485 or RS422 mode, this pin is Transmit Data 2 +.
15	3	TXD2	Transmit Data 2 – Serial port 2 transmit data out
		TX2-	TX2- – If in RS485 or RS422 mode, this pin is Transmit Data 2 -.

44 Reference Manual LittleBoard 550