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

Page 43
Image 43
Ampro Corporation XTX 820 manual Serial Ports 1

XTX 820 specifications

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