PC串口、并口接口定义

在电脑的使用中往往会遇到各种各样的连接线，下面就给出这些常见的连接线的连线方法以便于修理或查找故障。在介绍之前先对一些市场常用名词做出解释，现在所有的接头都可以分为公头和母头两大类： 公头：泛指所有针式的接头。 母头：泛指所有槽式的接头。

1、接口引脚定义：

2、9芯、25芯RS232接口的引脚对应关系： 严格地讲RS-232接口是DTE（数据终端设备）和DCE（数据通信设备）之间的一个接口。DTE包括计算机、终端、串口打印机等设备；DCE通常只有调制解调器（MODEM）和某些交换机COM口。标准指出DTE应该拥有一个插头（针输出），DCE拥有一个插座（孔输出）。这经常被制造商忽视（如:WYSE终端就是孔输出DTE串口）。但影响不大，只要搞清楚DCE、DTE然后按照标准接线图接线就不会错了（DTE、DCE 引脚定义相同）。 RS-232接口引脚定义：

3、接口外形及引脚英语缩写名：

（1）RS-232串行接口定义：

计算机侧为25针公插 ：

设备侧为25针母插：

PNIin ame TU-T ir 1 ND 2 XD 3 XD 4 TS G01 T03 R04 R05 1111D

引脚定义： Description Shield Ground Transmit Data Receive Data Request to Send 5 TS 6 SR 7 ND 8 D 9 10 1 2 3 4 5 6 7 8 9 0 1 2 3 4 C06 D07 G02 C09 - - 1111 - - Clear to Send Data Set Ready System Ground Carrier Detect RESERVED RESERVED Select Transmit Channel Secondary Carrier Detect Secondary Clear to Send Secondary Transmit Data Transmission Signal Element Timing Secondary Receive Data Receiver Timing Signal Element 1S1TF 26 1S.CD 1S.CTS 1S.TXD 1T1CK 14 1S.RXD 1R1CK 15 1L L41 1Local Loop Control Secondary Request to Send Data Terminal Ready Remote Loop Control Ring Indicator Data Signal Rate Selector Transmit Timing Signal Element 1S.RTS 2D1TR 08 2L 2I R40 R25 112D1SR 11 2X1CK 13 5 2I T42 1Test Indicator

（2）RS-422串行口定义

计算机侧 RS-422 串行接口的插头是 37 针公插：

设备侧 RS-422 串行接口的插头是 37 针母插：

Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Name GND SRI n/c SD ST RD RTS RR CTS LL DM TR RR RL IC SF/SR TT TM GND RC GND /SD - Dir

Description Shield Ground Signal Rate Indicator Spare Send Data Send Timing Receive Data Request To Send Receiver Ready Clear To Send Local Loopback Data Modem Terminal Ready Receiver Ready Remote Loopback Incoming Call Select Frequency/Select Rate Terminal Timing Test Mode Ground Receive Twister-Pair Common Spare Twister-Pair Return Send Data TPR 引脚定义：

23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 GND GND /RS /RT /CS IS /DM /TR /RR SS SQ NS /TT SB SC Send Timing TPR Receive Timing TPR Request To Send TPR Receive Timing TPR Clear To Send TPR Terminal In Service Data Mode TPR Terminal Ready TPR Receiver TPR Select Standby Signal Quality New Signal Terminal Timing TPR Standby Indicator Send Twister Pair Common

（3）PC 串行口定义： PC/AT 机上的串行口是 9 针公插座，引脚定义为：

Pin 1 2 3 4 5 6 7 8 9 Name CD RXD TXD DTR GND DSR RTS CTS RI Dir Description Carrier Detect Receive Data Transmit Data Data Terminal Ready System Ground Data Set Ready Request to Send Clear to Send Ring Indicator 引脚定义：

PC/XT 机上的串行口是 25 针公插座，引脚定义为：

Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Name SHIELD TXD RXD RTS CTS DSR GND CD n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c DTR n/c RI n/c n/c n/c - - - - - - - - - - - - - - - - Dir -

Description Shield Ground Transmit Data Receive Data Request to Send Clear to Send Data Set Ready System Ground Carrier Detect Data Terminal Ready Ring Indicator 引脚定义：

（4）PC 并行接口定义： PC 并行接口外观是 25 针母插座：

引脚定义：

Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Name /STROBE D0 D1 D2 D3 D4 D5 D6 D7 /ACK BUSY PE SEL /AUTOFD /ERROR /INIT /SELIN GND GND GND GND GND GND GND GND Dir Description Strobe Data Bit 0 Data Bit 1 Data Bit 2 Data Bit 3 Data Bit 4 Data Bit 5 Data Bit 6 Data Bit 7 Acknowledge Busy Paper End Select Autofeed Error Initialize Select In Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground