Ampro Corporation MightyBoard 821 manual Pin # Signal Description

Chapter 3Hardware

Table 3-4. Serial 2 (COM2) Interface Pin/Signal Descriptions (J6)

	Pin #	Pin #	Signal		Description
		DB9
	1	1	DCD2*		Data Carrier Detect 2 – Indicates external serial communications device 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 DTR2/DSR2 handshake.
	2	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.
	3	2	RXD2		Receive Data 2 – Serial port 2 receive data in
	4	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.
	5	3	TXD2		Transmit Data 2 – Serial port 2 transmit data out
	6	8	CTS2*		Clear to Send 2 – Indicates external serial communications device is ready
					to receive data. Used as hardware handshake with RTS2 for low level flow
					control.
	7	4	DTR2*		Data Terminal Ready 2 – Indicates Serial port 2 is powered, initialized, and
					ready. Used as hardware handshake with DSR2 for overall readiness to
					communicate.
	8	9	RI2*		Ring Indicator 2 – 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	NC		Not connected
	Note: The shaded area denotes power or ground.
Table 3-5. Serial 3 and 4 (COM3 and COM4) Interface Pin/Signal Descriptions (J15)
	Pin #	Pin #		Signal		Description
		DB9
	1	1(COM3)		DCD3*		Data Carrier Detect 3 – Indicates external serial communications
						device is detecting a carrier signal (i.e., a communication channel is
						currently open). In direct connect environments, this input will be
						driven by DTR3 as part of the DTR3/DSR3 handshake.
	2	6		DSR3*		Data Set Ready 3 – Indicates external serial communications device is
						powered, initialized, and ready. Used as hardware handshake with
						DTR3 for overall readiness to communicate.
	3	2		RXD3		Receive Data 3 – Serial port 3 receive data in
				RX3-		RX3- – If in RS485 or RS422 mode, this pin is Receive Data 3 -.
	4	7		RTS3*		Request To Send 3 – Indicates Serial port 3 is ready to transmit data.
						Used as hardware handshake with CTS3 for low level flow control.
				TX3+		TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.
	5	3		TXD3		Transmit Data 3 – Serial port 3 transmit data out
				TX3-		TX3- – If in RS485 or RS422 mode, this pin is Transmit Data 3 -.

MightyBoard 821 Reference Manual 19