COM口各个针脚的定义

RS232串口针脚定义

9针接口针脚定义：

Pin 1 CD Received Line Signal Detector (Data Carrier Detect) Pin 2 RXD Received Data

Pin 3 TXD Transmit Data

Pin 4 DTR Data Terminal Ready

Pin 5 GND Signal Ground

Pin 6 DSR Data Set Ready

Pin 7 RTS Request To Send

Pin 8 CTS Clear To Send

Pin 9 RI Ring Indicator

9芯信号方向来自缩写描述

1 调制解调器CD 载波检测

2 调制解调器RXD 接收数据

3 PC TXD 发送数据

4 PC DTR 数据终端准备好

5 GND 信号地

6 调制解调器DSR 通讯设备准备好

7 PC RTS 请求发送

8 调制解调器CTS 允许发送

9 调制解调器RI 响铃指示器

注：调制解调器 (在这里是一个例子，它可以是其它的RS232终端设备)

39 DASP# I/O I2U, O1

40 GND Ground

jumper241 VDD Power

42 VDD Power

43 GND Ground

44 NC

T2-1.6 519

1. Please refer to Sections

3.1 to 2.3.4 for detail

2. Pin 28 is CSEL in standard host 40-pin IDE interface. Master/ Slave setting is selected through an on-board jumper.

3. Pin 30 is jumper selectable as NC or WP#.

RS485接线脚定义

1----D+/A

2----D-/A

5----GND

6----+5V

40pin HD interface

Pin No. Signal Name Pin Type I/O Type1

1 RESET# I I4U

2 GND Ground

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