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并口和串口有什么区别?
2009-05-13 13:51:54

wangguishan :并口和串口有什么区别?   tuobi:   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:       引脚定义    Pin Name ITU-T Dir Description   1 GND 101 Shield Ground   2 TXD 103 Transmit Data   3 RXD 104 Receive Data   4 RTS 105 Request to Send   5 CTS 106 Clear to Send   6 DSR 107 Data Set Ready   7 GND 102 System Ground   8 CD 109 Carrier Detect   9 -   - RESERVED   10 -   - RESERVED   11 STF 126 Select Transmit Channel   12 S.CD ? Secondary Carrier Detect   13 S.CTS ? Secondary Clear to Send   14 S.TXD ? Secondary Transmit Data   15 TCK 114 Transmission Signal Element Timing   16 S.RXD ? Secondary Receive Data   17 RCK 115 Receiver Signal Element Timing   18 LL 141 Local Loop Control   19 S.RTS ? Secondary Request to Send   20 DTR 108 Data Terminal Ready   21 RL 140 Remote Loop Control   22 RI 125 Ring Indicator   23 DSR 111 Data Signal Rate Selector   24 XCK 113 Transmit Signal Element Timing   25 TI 142 Test Indicator      PC/AT 机上的串行口是 9 针公插座,引脚定义为:      Pin Name Dir Description   1 CD Carrier Detect   2 RXD Receive Data   3 TXD Transmit Data   4 DTR Data Terminal Ready   5 GND System Ground   6 DSR Data Set Ready   7 RTS Request to Send   8 CTS Clear to Send   9 RI Ring Indicator      PC/XT 机上的串行口是 25 针公插座,引脚定义为:      Pin Name Dir Description   1 SHIELD - Shield Ground   2 TXD Transmit Data   3 RXD Receive Data   4 RTS Request to Send   5 CTS Clear to Send   6 DSR Data Set Ready   7 GND - System Ground   8 CD Carrier Detect   9 n/c -     10 n/c -     11 n/c -     12 n/c -     13 n/c -     14 n/c -     15 n/c -     16 n/c -     17 n/c -     18 n/c -     19 n/c -     20 DTR Data Terminal Ready   21 n/c -     22 RI Ring Indicator   23 n/c -     24 n/c -     25 n/c -         PC 并行接口定义   PC 并行接口外观是 25 针母插座:      Pin Name Dir Description   1 /STROBE Strobe   2 D0 Data Bit 0   3 D1 Data Bit 1   4 D2 Data Bit 2   5 D3 Data Bit 3   6 D4 Data Bit 4   7 D5 Data Bit 5   8 D6 Data Bit 6   9 D7 Data Bit 7   10 /ACK Acknowledge   11 BUSY Busy   12 PE Paper End   13 SEL Select   14 /AUTOFD Autofeed   15 /ERROR Error   16 /INIT Initialize   17 /SELIN Select In   18 GND Signal Ground   19 GND Signal Ground   20 GND Signal Ground   21 GND Signal Ground   22 GND Signal Ground   23 GND Signal Ground   24 GND Signal Ground   25 GND Signal Ground