串å£å«å串è¡æ¥å£ï¼ä¹ç§°ä¸²è¡éä¿¡æ¥å£ï¼æçµæ°æ åååè®®æ¥åå
æ¬RS-232-CãRS-422ãRS485ãUSBçã RS-232-CãRS-422ä¸RS-485æ ååªå¯¹æ¥å£ççµæ°ç¹æ§ååºè§å®ï¼ä¸æ¶åæ¥æ件ãçµç¼æåè®®ãUSBæ¯è¿å å¹´åå±èµ·æ¥çæ°åæ¥å£æ åï¼ä¸»è¦åºç¨äºé«éæ°æ®ä¼ è¾é¢åã
RS-232-Cï¼ä¹ç§°æ å串å£ï¼æ¯ç®åæ常ç¨çä¸ç§ä¸²è¡é讯æ¥å£ãå®æ¯å¨1970å¹´ç±ç¾å½çµåå·¥ä¸åä¼ï¼EIAï¼èåè´å°ç³»ç»ã è°å¶è§£è°å¨å家å计ç®æºç»ç«¯ç产å家å
±åå¶å®çç¨äºä¸²è¡é讯çæ åãå®çå
¨åæ¯âæ°æ®ç»ç«¯è®¾å¤ï¼DTEï¼åæ°æ®é讯设å¤ï¼DCEï¼ä¹é´ 串è¡äºè¿å¶æ°æ®äº¤æ¢æ¥å£ææ¯æ åâãä¼ ç»çRS-232-Cæ¥å£æ åæ22æ ¹çº¿ï¼éç¨æ å25è¯Dåæ头座ãåæ¥çPCä¸ä½¿ç¨ç®åäºç9è¯Dåæ座ãç°å¨åºç¨ä¸25è¯æ头座已å¾å°éç¨ãç°å¨ççµèä¸è¬æ两个串è¡å£ï¼COM1åCOM2ï¼ä½ å°è®¡ç®æºåé¢è½çå°9éDå½¢æ¥å£å°±æ¯äºãç°å¨æå¾å¤ææºæ°æ®çº¿æè
ç©æµæ¥æ¶å¨é½éç¨COMå£ä¸è®¡ç®æºç¸è¿ã
RS-422ï¼ä¸ºæ¹è¿RS-232éä¿¡è·ç¦»çãéçä½ç缺ç¹ï¼RS-422å®ä¹äºä¸ç§å¹³è¡¡éä¿¡æ¥å£ï¼å°ä¼ è¾éçæé«å°10Mb/sï¼ä¼ è¾è·ç¦»å»¶é¿å°4000è±å°ºï¼éçä½äº100kb/sæ¶ï¼ï¼å¹¶å
许å¨ä¸æ¡å¹³è¡¡æ»çº¿ä¸è¿æ¥æå¤10个æ¥æ¶å¨ãRS-422æ¯ä¸ç§åæºåéãå¤æºæ¥æ¶çååãå¹³è¡¡ä¼ è¾è§èï¼è¢«å½å为TIA/EIA-422-Aæ åã
RS-485ï¼ä¸ºæ©å±åºç¨èå´ï¼EIAåäº1983å¹´å¨RS-422åºç¡ä¸å¶å®äºRS-485æ åï¼å¢å äºå¤ç¹ãååéä¿¡è½åï¼å³å
许å¤ä¸ªåéå¨è¿æ¥å°åä¸æ¡æ»çº¿ä¸ï¼åæ¶å¢å äºåéå¨ç驱å¨è½ååå²çªä¿æ¤ç¹æ§ï¼æ©å±äºæ»çº¿å
±æ¨¡èå´ï¼åå½å为TIA/EIA-485-Aæ åã
Universal Serial Busï¼éç¨ä¸²è¡æ»çº¿)ç®ç§°USBï¼æ¯ç®åçµèä¸åºç¨è¾å¹¿æ³çæ¥å£è§èï¼ç±IntelãMicrosoftãCompaqãIBMãNECãNorthern Telcomçå 家大åååèµ·çæ°åå¤è®¾æ¥å£æ åãUSBæ¥å£æ¯çµè主æ¿ä¸çä¸ç§åéæ¥å£ï¼å
¶ä¸ä¸é´ä¸¤ä¸ªéä¼ è¾æ°æ®ï¼ä¸¤è¾¹ä¸¤ä¸ªéç»å¤è®¾ä¾çµãUSBæ¥å£é度快ãè¿æ¥ç®åãä¸éè¦å¤æ¥çµæºï¼ä¼ è¾é度12Mbpsï¼ææ°USB2.0å¯è¾¾480Mbpsï¼çµç¼æ大é¿åº¦5ç±³ï¼USBçµç¼æ4æ¡çº¿ï¼2æ¡ä¿¡å·çº¿ï¼2æ¡çµæºçº¿ï¼å¯æä¾5ä¼ç¹çµæºï¼USBçµç¼è¿åå±è½åéå±è½ä¸¤ç§ï¼å±è½çµç¼ä¼ è¾é度å¯è¾¾12Mbpsï¼ä»·æ ¼è¾è´µï¼éå±è½çµç¼é度为1.5Mbpsï¼ä½ä»·æ ¼ä¾¿å®ï¼USBéè¿ä¸²èæ¹å¼æå¤å¯ä¸²æ¥127个设å¤ï¼æ¯æå³æå³ç¨åçææã
RJ-45æ¥å£æ¯ä»¥å¤ªç½æ为常ç¨çæ¥å£ï¼RJ45æ¯ä¸ä¸ªå¸¸ç¨å称ï¼æçæ¯ç±IEC (60)603-7æ ååï¼ä½¿ç¨ç±å½é
æ§çæ¥æ件æ åå®ä¹ç8个ä½ç½®(8é)ç模ååæåæè
æ头ã
串å£ä¸å¹¶å£çåºå«ï¼
串å£å½¢å®¹ä¸ä¸å°±æ¯ ä¸æ¡è½¦éï¼è并å£å°±æ¯æ8个车éåä¸æ¶å»è½ä¼ é8ä½ï¼ä¸ä¸ªåèï¼æ°æ®ã
ä½æ¯å¹¶ä¸æ¯å¹¶å£å¿«ï¼ç±äº8ä½ééä¹é´çäºç¸å¹²æ°ãä¼ è¾åé度就åå°äºéå¶ãèä¸å½ä¼ è¾åºéæ¶ï¼è¦åæ¶éæ°ä¼ 8个ä½çæ°æ®ã串å£æ²¡æå¹²æ°ï¼ä¼ è¾åºéåéåä¸ä½å°±å¯ä»¥äºãæ以è¦æ¯å¹¶å£å¿«ã串å£ç¡¬çå°±æ¯è¿æ ·è¢«äººä»¬éè§çã
交æ¢æºç串å£:
交æ¢æºç串å£çè±æå°±æ¯trunk;æ¯ç¨æ¥åä¸ä¸è·³è·¯ç±è½¬æ¢ç¨ç.没个VLANåªæåè¿ä¸TRUNKçè·¯ç±æååæè½ä¸å¤ç½
å¼è说æï¼
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
并å£
并è¡æ¥å£ï¼ç®ç§°å¹¶å£ã并å£éç¨çæ¯25éDå½¢æ¥å¤´ãæè°â并è¡âï¼æ¯æ8ä½æ°æ®åæ¶éè¿å¹¶è¡çº¿è¿è¡ä¼ éï¼è¿æ ·æ°æ®ä¼ éé度大大æé«ï¼ä½å¹¶è¡ä¼ éç线路é¿åº¦åå°éå¶ï¼å 为é¿åº¦å¢å ï¼å¹²æ°å°±ä¼å¢å ï¼æ°æ®ä¹å°±å®¹æåºéã
ç®åï¼å¹¶è¡æ¥å£ä¸»è¦ä½ä¸ºæå°æºç«¯å£çã
串å£ä¸å¹¶å£çåºå«ï¼
串å£å½¢å®¹ä¸ä¸å°±æ¯ ä¸æ¡è½¦éï¼è并å£å°±æ¯æ8个车éåä¸æ¶å»è½ä¼ é8ä½ï¼ä¸ä¸ªåèï¼æ°æ®ã
ä½æ¯å¹¶ä¸æ¯å¹¶å£å¿«ï¼ç±äº8ä½ééä¹é´çäºç¸å¹²æ°ãä¼ è¾åé度就åå°äºéå¶ãèä¸å½ä¼ è¾åºéæ¶ï¼è¦åæ¶éæ°ä¼ 8个ä½çæ°æ®ã串å£æ²¡æå¹²æ°ï¼ä¼ è¾åºéåéåä¸ä½å°±å¯ä»¥äºãæ以快æ¯å¹¶å£å¿«ã串å£ç¡¬çå°±æ¯è¿æ ·è¢«äººä»¬éè§çã
温馨提示:答案为网友推荐,仅供参考