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href="/SeverZc/InterWl.aspx?InterD=81%2c82"><img class="img" src="../images/fww_1.jpg" /></a></div> --> </div> <div class="right"> <div class="rt_1"><h1>rs485/rs232机房环境监控的布¾U¿æ–¹æ³?/h1></div> <div class="rt_2"> <p><div> <p style="TEXT-DECORATION: none; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; COLOR: rgb(80,80,80); TEXT-ALIGN: left; FONT: 14px/22px Verdana, Arial, Helvetica, sans-serif; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; font-stretch: normal; -webkit-text-stroke-width: 0px"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">布线问题åQ?85æ€Èº¿çš„èµ°¾U¿è¦ž®½é‡˜qœç¦»òq²æ‰°æºï¼Œåœ¨æ–½å·¥è¿‡½E‹ä¸­åQŒæœ‰å¾ˆå¤šäºÞZؓ了çœäº‹ï¼Œž®?85¾U¿èµ\与电æºçº¿è·¯ä¸€èµ¯‚µ°¾U¿ï¼Œ˜q™æ ·æ˜¯ä¸åˆç†çš„，甉|º¾U¿ä¼šäº§ç”Ÿòq²æ‰°åQŒå¯¼è‡?85通信ä¸ç¨³å®šï¼Œ˜q˜æœ‰ž®±æ˜¯485布线必须˜qœç¦»¾cÖM¼¼äºŽå˜åŽ‹å™¨åQŒå˜é¢‘器½{‰å¼ºç”µåŽ‹òq²æ‰°æºã€?/span></p> <p style="TEXT-DECORATION: none; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; COLOR: rgb(80,80,80); TEXT-ALIGN: left; FONT: 14px/22px Verdana, Arial, Helvetica, sans-serif; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; font-stretch: normal; -webkit-text-stroke-width: 0px"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">　　æ€Èº¿æ‹“扑问题åQšç”±äºŽçŽ°åœºçŽ¯å¢ƒå¤æ‚，485讑֤‡åˆ†å¸ƒä¸€èˆ¬éƒ½æ¯”较散äØ•åQŒæ–½å·¥äh员äؓ图方便，没有按照485规范ž®†çº¿è·¯å¸ƒè®¾æˆæ‰‹ç‰µæ‰‹èŠèŠ±é“¾æ€Èº¿å¼æ‹“扑结构，而是éšæ„布设æˆæ˜Ÿåž‹ï¼Œæ ‘型甚至多ç§æ‹“扑¾l“æž„æ··åˆåž‹çš„åQŒç•™å‡ºå¤ªå¤šå¤ªé•¿çš„分支åQŒåœ¨å®žé™…应用中，å•çº¯çš„星型，树型拓扑¾l“构甚至混åˆæ‹“扑¾l“构有的时候也是å¯ä»¥ä‹É用的åQŒä½†æ˜¯é€šä¿¡è‚¯å®šä¼šä¸½E›_®šåQŒå¦‚果一定è¦å¸ƒè®¾æ˜Ÿåž‹åQŒæ ‘型拓扑结构的è¯ï¼Œå»ø™®®ä½¿ç”¨485集线器和485中ç‘ô器，相关的应用å¯ä»¥å‚è€?/span><span style="COLOR: rgb(0,0,0)"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">485æ€Èº¿æ‹“扑¾l“构问题</span></span><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">™åµé¢ã€?/span></p> <p style="TEXT-DECORATION: none; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; COLOR: rgb(80,80,80); TEXT-ALIGN: left; FONT: 14px/22px Verdana, Arial, Helvetica, sans-serif; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; font-stretch: normal; -webkit-text-stroke-width: 0px"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">　　接地问题:åœ?85æ€Èº¿å¸ƒçº¿è§„范里é¢åQŒå¼ºè°ƒéœ€è¦å•ç‚¹å¯é æŽ¥åœŽÍ¼Œä½†æ˜¯åœ¨å®žé™…施工中åQ?85æ€Èº¿æŽ¥åœ°æœ‰æ—¶å而会起到å作用。由äº?85布线需è¦æ‰‹ç‰‰|‰‹èŠèŠ±é“¾æ–¹å¼è¿žæŽ¥ï¼Œä½¿ç”¨çš„å±è”½åŒ¾lžçº¿è‚¯å®šéƒ½ä¼šè¢«å‰ªæ–­è¿žæŽ¥åœ¨485讑֤‡ä¸Šï¼Œè€Œä¸€èˆ¬å¤§å¤šéƒ½ä¼šåˆ©ç”¨å¤–é¢çš„å±è”½å±‚作为地¾U¿ï¼Œå¦‚果没有ž®†å±è”½å±‚åšè‰¯å¥½çš„˜qžæŽ¥çš„è¯åQŒæŽ¥åœ°å而å¯èƒ½ä¼šå¯ÆD‡´485ä¿¡å·ä¸ç¨³å®šï¼Œæ‰€ä»?85¾U¿èµ\接地必须是å•ç‚¹å¯é æŽ¥åœ°ã€?/span></p> <p style="TEXT-DECORATION: none; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; COLOR: rgb(80,80,80); TEXT-ALIGN: left; FONT: 14px/22px Verdana, Arial, Helvetica, sans-serif; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; font-stretch: normal; -webkit-text-stroke-width: 0px"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">　　传输è·ç¦»é—®é¢˜åQ?85æ€Èº¿ä¼ è¾“è·ç¦»ä¸?200¾c»I¼Œè¯¥ä¼ è¾“è·¼›ÀLœ‰é™å®šæ¡äšgåQšæ‡L特率低于110KbpsåQŒä‹É用标准的å±è”½åŒç»ž¾U¿ï¼Œ¾U¿å¾„è¦è¾¾åˆîC¸€å®šæ ‡å‡†ï¼Œæ‰€æŽ¥è´Ÿè½½äؓ一å?85讑֤‡,外部没有强烈的电¼‚干扰等。传输跼›ÖM¸Žé€šä¿¡æ³¢ç‰¹çŽ‡æˆå比åQŒä¸Žé€šä¿¡¾U¿èµ\¾U¿å¾„æˆæ­£æ¯”，负貭‘Šå¤šä¼ è¾“è·ç¦»­‘ŠçŸ­åQŒå¤–部干扰越大传输跼›»è¶ŠçŸ­ã€‚å¾è®®åœ¨å¸ƒè®¾¾U¿èµ\æ—Óž¼Œæœ€å¥½ç•™æœ‰å†—余，因äØ“éšç€¾U¿èµ\çš„è€åŒ–åQŒä¼ è¾“è·¼›Õd¯èƒ½ä¼šå˜çŸ­åQŒé€šä¿¡å¯èƒ½ä¼šä¸½E›_®šåQŒç•™æœ‰å†—余的è¯ï¼Œ˜q™ç§æƒ…况基本ä¸ä¼šå‡ºçŽ°ã€‚当485¾U¿èµ\传输è·ç¦»­‘…过1000¾c»I¼Œå»ø™®®é€šè¿‡å¢žåŠ </span><span style="COLOR: rgb(0,0,0)"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">485中ç‘ôå™?/span></span><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">廉™•¿é€šä¿¡è·ç¦»ã€?/span></p> <p style="TEXT-DECORATION: none; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; COLOR: rgb(80,80,80); TEXT-ALIGN: left; FONT: 14px/22px Verdana, Arial, Helvetica, sans-serif; WIDOWS: 1; LETTER-SPACING: normal; TEXT-INDENT: 0px; font-stretch: normal; -webkit-text-stroke-width: 0px"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">　　负è²é—®é¢˜åQšæ ‡å‡†çš„485芯片负è²èƒ½åŠ›ä¸?2个，现在æœ?85芯片已ç»è´Ÿè²èƒ½åŠ›è¾‘Öˆ°128个甚è‡?00个，但是实际使用中åƈä¸èƒ½å¤Ÿå®Œå…¨è¾¾åˆ°æ ‡¿U°å€¼çš„åQŒåª„å“?85芯片负è²èƒ½åŠ›çš„å’Œä»?85讑֤‡çš„设计也是有关系的，˜q˜æœ‰å’Œé€šä¿¡è·ç¦»ä¹Ÿæœ‰å…³ç³»ã€‚如æž?85讑֤‡ä¸Šå¸¦æœ‰ä¸Šä¸‹æ‹‰ç”µé˜»æˆ–者防é›ïL®¡åQŒç”±äºŽå…¶ä¼šå¸æ”¶ç”µåŽ‹ï¼Œä¼šå¤§å¤§çš„é™ä½Žè¯¥æ¡485¾U¿èµ\上的负è²èƒ½åŠ›åQŒè¿˜æœ‰åœ¨485¾U¿ä¸ŠåŠ?20‹Æ§å§†çš„匹é…阻抗电é˜ÖM¹Ÿä¼šåª„å“负载能力，传输è·ç¦»­‘Šè¿œåQŒè´Ÿè½½èƒ½åŠ›ä¹Ÿä¼šç›¸åº”çš„é™ä½Žã€‚åŒæ ïLš„åQŒä¹Ÿå»ø™®®åœ¨è´Ÿè½½é—®é¢˜ä¸Šç•™æœ‰å†—ä½™åQŒå½“è´Ÿè²ä¸å¤Ÿçš„时候，å¯ä»¥é€šè¿‡æ·ÕdŠ 485中ç‘ô器，</span><span style="COLOR: rgb(0,0,0)"><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">485集线å™?/span></span><span style="FONT-SIZE: 14px; FONT-FAMILY: 'Microsoft YaHei'">æ¥è§£å†³ç›¸åº”的问题ã€?/span></p></div></p> </div> </div> </div> <div class="bottom"> <div class="btm_1"> <div class="b_txk"> <div class="tx_1"> <div class="tx_1tx"><a href="#">会员中心</a></div> 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