硬件接口定义规范I模板

1．计算机侧为25针公插:

Pin Name ITU-T Dir Description

1GND101Shield Ground

2TXD103Transmit Data

3RXD104Receive Data

4RTS105Request to Send

5CTS106Clear to Send

6DSR107Data Set Ready

7GND102System Ground

8CD109Carrier Detect

9--RESERVED

10--RESERVED

11STF126Select Transmit Channel

12S.CD?Secondary Carrier Detect

13S.CTS?Secondary Clear to Send

14S.TXD?Secondary Transmit Data

15TCK114Transmission Signal Element Timing

16S.RXD?Secondary Receive Data

17RCK115Receiver Signal Element Timing

18LL141Local Loop Control

19S.RTS?Secondary Request to Send

20DTR108Data Terminal Ready

21RL140Remote Loop Control

22RI125Ring Indicator

23DSR111Data Signal Rate Selector

24XCK113Transmit Signal Element Timing

25TI142Test Indicator

2．PC/AT 机上的串行口是9 针公插座, 引脚定义为:

Pin Name Dir Description

1CD Carrier Detect

2RXD Receive Data

3TXD Transmit Data

4DTR Data Terminal Ready

5GND System Ground

6DSR Data Set Ready

7RTS Request to Send

8CTS Clear to Send

9RI Ring Indicator

3．PC 并行接口外观是25 针母插座:

Pin Name Dir Description

1/STROBE Strobe

2D0Data Bit 0

3D1Data Bit 1

4D2Data Bit 2

5D3Data Bit 3

6D4Data Bit 4

7D5Data Bit 5

8D6Data Bit 6

9D7Data Bit 7

10/ACK Acknowledge

11BUSY Busy

12PE Paper End

13SEL Select

14/AUTOFD Autofeed

15/ERROR Error

16/INIT Initialize

17/SELIN Select In

18GND Signal Ground

19GND Signal Ground

20GND Signal Ground

21GND Signal Ground

22GND Signal Ground

23GND Signal Ground

24GND Signal Ground

25GND Signal Ground

4．PS/2 鼠标接口为6 针母插, 外观为:

Pin Name Dir Description

1DATA Key Data

2n/c-Not connected

3GND Gnd

4VCC Power , +5 VDC

5CLK Clock

6n/c-Not connected

5．键盘接口为5 针母插座:

Pin Name Description Technical

1CLOCK Clock CLK/CTS, Open-collector

2DATA Data RxD/TxD/RTS, Open-collector

3n/c Not connected Reset on some very old keyboards.