COM口各个针脚的定义.doc

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 DataPin 3 TXD Transmit DataPin 4 DTR Data Terminal ReadyPin 5 GND Signal GroundPin 6 DSR Data Set ReadyPin 7 RTS Request To SendPin 8 CTS Clear To SendPin 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3PCTXD发送数据4PCDTR数据终端准备好5GND信号地6调制解调器DSR通讯设备准备好7PCRTS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)25针并口针脚定义针 脚 功 能 1 选通 (STROBE 低电平) 2 数据位0 (DATAO) 3 数据位1 (DATA1) 4 数据位2 (DATA2) 5 数据位3 (DATA3) 6 数据位4 (DATA4) 7 数据位5 (DATA5) 8 数据位6 (DATA6) 9 数据位7 (DATA7) 10 确认 (ACKNLG 低电平) 11 忙 (BUSY) 12 缺纸 (PE) 13 选择 (SLCT) 14 自动换行 (AUTO FEED 低电平) 15 错误 (ERROR 低电平) 16 初始化 (INIT 低电平) 17 选择输入 (SLCT IN 低电平) 18-25 地线 (GND) 44pin HD interface Pin No. Signal Name Pin Type I/O Type1 1 RESET# I I4U 2 GND Ground 3 D7 I/O I2D, O2 4 D8 I/O I2D, O2 5 D6 I/O I2D, O2 6 D9 I/O I2D, O2 7 D5 I/O I2D, O2 8 D10 I/O I2D, O2 9 D4 I/O I2D, O2 10 D11 I/O I2D, O2 11 D3 I/O I2D, O2 12 D12 I/O I2D, O2 13 D2 I/O I2D, O2 14 D13 I/O I2D, O2 15 D1 I/O I2D, O2 16 D14 I/O I2D, O2 17 D0 I/O I2D, O2 18 D15 I/O I2D, O2 19 GND Ground 20 NC 21 NC 22 GND Ground 23 IOWR# I I3U 24 GND Ground 25 IORD# I I3U 26 GND Ground 27 NC 28 NC2 29 NC 30 NC/WP#3 I2U 31 INTRQ O O1 32 IOCS16# O O2 33 A1 I I2D 34 PDIAG# I/O I2U, O1 35 A0 I I2D 36 A2 I I2D 37 CS1FX# I I3U 38 CS3FX# I I3U 39 DASP# I/O I2U, O1 40 GND Ground 41 VDD Power 42 VDD Power 43 GND Ground 44 NC T2-1.6 519 1. Please refer to Sections 2.3.1 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+/A2-D-/A5-GND6-+5V 40pin HD interface Pin No. Signal Name Pin Type I/O Type1 1 RESET# I I4U 2 GND Ground 3 D7 I/O I2D, O2 4 D8 I/O I2D, O2 5 D6 I/O I2D, O2 6 D9 I/O I2D, O2 7 D5 I/O I2D, O2 8 D10 I/O I2D, O2 9 D4 I/O I2D, O2 10 D11 I/O I2D, O2 11 D3 I/O I2D, O2 12 D12 I/O I2D, O2 13 D2 I/O I2D, O2 14 D13 I/O I2D, O2 15 D1 I/O I2D, O2 16 D14 I/O I2D, O2 17 D0 I/O I2D, O2 18 D15 I/O I2D, O2 19 GND Ground 20 VDD 21 NC 22 GND Ground 23 IOWR# I I3U 24 GND Ground 25 IORD# I I3U 26 GND Ground 27 NC 28 NC3 29 NC 30 NC/WP#4 I2U 31 INTRQ O O1 32 IOCS16# O O2 33 A1 I I2D 34 PDIAG# I/O I2U, O1 35 A0 I I2D 36 A2 I I2D 37 CS1FX# I I3U 38 CS3FX# I I3U 39 DASP# I/O I2U, O1 40 GND Ground T2-2.6 519 1. Please refer to Sections 2.3.1 to 2.3.4 for detail. 2. Optional, not available in standard host 40-pin IDE interface. 3. Pin 28 is CSEL in standard h