数据通信设备.docVIP

数据通信设备(Data Communication Equipment) 数据终端设备(Data Terminal Equipment) 可以这样认为DCE为源设备接口而DTE为终端设备接口。 25RS-232脚定义 PIN号 Description 1 Protective Ground 2 Transmitted Data??发送数据 3 Received Data????????接受数据 4 Request to Send????要求发送 5 Clear to Send?????? 可发送 6 Data set Ready?????? 数据设定完成 7 Sgnal Ground 8 Received Data Carrier Detect 侦测接受载波 9 Reserved??????????未使用 10 Reserved??????????未使用 11 Reserved????????????未使用 12 Secondary Data Carrier Detector 13 Secondary Clear to Send 14 Secondary Transmitted Data 15 Transmit Clock 16 Secondary Received Data 17 Receiver Clock???? 接受信号源时间 18 Reserved?????????? 未使用 19 Secondary Request to Send 20 Data Terminal Ready 数据终端准备好 21 Signal Quality Detector 22 Ring Indicator 振铃指示 23 Data Rate Select 24 External Clock 外部时钟 25 Reserved???????????? 未使用 9针RS-232脚定义 PIN Description 1 媒体检测 2 接受数据 3 发送数据 4 数据终端准备好 5 信号地 6 数据装置准备好 7 请求发送 8 清除发送 9 振铃指示器 并行口信号定义 PIN号 Describtion 1 STORBE 2 to9 D0----D7 10 ACK 11 BUSY 12 PE 13 SLCT 14 AUTO-FEED 15 ERROR 16 INIT 17 SLCT IN 18 to 25 GND ? 常用的一些线序连接 9pin female 25pin male 1 DCD 8 2 RD 3* 3 TD 2 4 DTR 20* 5 SG 7* 6DTR 22 7 RTS 5 8 CTS 4 9 RI 6 Used for: 1)PC COM1 to DCE of 牋 CDR or terminal *NOTES:Must be Used 25pin male 25pin male 2 15 3 13 4 12 5 10 6 11 10 5 11 6 12 4 13 3 15 2 25 25 Used for: 1)Parrial transfer Mode ? 25pin male 25pin male 2 2 3 3 4 4 5 5 7 7 8 8 20 20 Used for: 1)PBX treminal to G3- MT DTE port 25pin male 25 pin male 2 3 3 2 4 5 5 4 7 7 8 20 20 8 Used for : 1)PBX terminal to G3-MT 牋 DCE port . 25 pin female 25pin male 2 3 3 2 56 20 7 7 20 56 Used for: 1) PC COM2 to DCE of 牋牋CECDR. ? 25 PIN 25 PIN 1 GND 1 2 TXD 3 3 RXD 2 4 RTS5 CTS 8 8 CD 45 6 DSR 20 20 DTR 6 7 GND 7 Used for: Cross connectons 9pin male 25pin female 2 3 3 2 4 20 5 7 7 4 Fix