Ampro Corporation XTX 820 manual Serial Ports 1

Chapter 3 Hardware

Serial Ports 1 and 2

The Super I/O (W83627HG) provides the circuitry for two serial ports with TTL compatible. Serial ports 1 (COM1) and 2 (COM2) are provided to the baseboard through connector J3. The serial port features are:

•Two individual 16550-compatible UARTs

•Programmable word length, stop bits and parity

•16-bit programmable baud rate generator

•Loop-back mode

•Two individual 16-bit FIFOs

The standard serial DB9 cable pin-outs are listed in Table 3-18 for reference along with the J3 connector pins. DB9 connectors can be located on the custom baseboard, as application requires.

Table 3-18. Simplified Serial Interface Pin/Signal Descriptions (J3)

J3	Pin #	Signal	Description
Pin #	DB9
89	1	DCD1*	Data Carrier Detect 1 – Indicates external serial device is detecting a carrier
	(COM1)		signal (i.e., a communication channel is currently open). In direct connect
			environments, this input is driven by DTR1 as part of the DTR1/DSR1
			handshake.
91	6	DSR1*	Data Set Ready 1 – Indicates external serial device is powered, initialized,
			and ready. Used as hardware handshake with DTR1 for overall readiness.
83	2	RXD1	Receive Data 1 – Serial port 1 receive data in.
85	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.
95	3	TXD1	Transmit Data 1 – Serial port 1 transmit data out
93	8	CTS1*	Clear To Send 1 – Indicates external serial device is ready to receive data.
			Used as hardware handshake with RTS1 for low level flow control.
87	4	DTR1*	Data Terminal Ready 1 – Indicates Serial port 1 is powered, initialized, and
			ready. Used as hardware handshake with DSR1 for overall readiness.
97	9	RI1*	Ring Indicator 1 – Indicates external serial device is detecting a ring
			condition. Used by software to initiate operations to answer and open the
			communications channel.
	5	GND	Ground
10	NC	KEY/NC	Key/Not connected
71	1	DCD2*	Data Carrier Detect 2 – Indicates external serial device is detecting a carrier
	(COM2)		signal (i.e., a communication channel is currently open). In direct connect
			environments, this input is driven by DTR2 as part of the DTR2/DSR2
			handshake.
73	6	DSR2*	Data Set Ready 2 – Indicates external serial device is powered, initialized,
			and ready. Used as hardware handshake with DTR2 for overall readiness.
63	2	RXD2	Receive Data 2 – Serial port 2 receive data in
67	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.
77	3	TXD2	Transmit Data 2 – Serial port 2 transmit data out

XTX 820 Reference Manual 37