设计一个RS485接口并能实现双机通讯的单片机应用系统
Rs485\u662f\u901a\u4fe1\u534f\u8bae\u8fd8\u662f\u7269\u7406\u63a5\u53e3\u554a?\u82e5\u53ea\u662f\u4e00\u4e2a\u63a5\u53e3,\u5c31\u662f\u8bf4\u901a\u8fc7\u8fd9\u4e2aRS485\u63a5\u53e3\u53ef\u4ee5\u5229\u7528\u4ec0\u4e48\u901a\u8baf\u534f\u8bae\u6765\u4f20\u8f93\u6570\u636e?485\u662f\u901a\u4fe1\u534f\u8bae\u8fd8\u662f\u7269\u7406\u63a5\u53e3\u554a?\u82e5\u53ea\u662f\u4e00\u4e2a\u63a5\u53e3,\u5c31\u662f\u8bf4\u901a\u8fc7\u8fd9\u4e2aRS485\u63a5\u53e3\u53ef\u4ee5\u5229\u7528\u4ec0\u4e48\u901a\u8baf\u534f\u8bae\u6765\u4f20\u8f93\u6570\u636e?\u7b54\uff1a\u53ef\u4ee5\u8bf4RS485\u7684\u51fa\u73b0\u89e3\u51b3\u4e86\u5b9e\u73b0\u8054\u7f51\u529f\u80fd\uff0c\u8fd9\u662fRS232\u63a5\u53e3\u4e0d\u80fd\u5b9e\u73b0\u7684\u529f\u80fd\uff0c\u968f\u7740RS485\u82af\u7247\u5927\u91cf\u4f7f\u7528\u5728\u5de5\u4e1a\u63a7\u5236\u3001\u7535\u529b\u901a\u8baf\u3001\u667a\u80fd\u4eea\u8868\u7b49\u9886\u57df\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u662f\u91c7\u7528\u4e32\u53e3\u901a\u4fe1\u7684\u65b9\u5f0f\u8fdb\u884c\u6570\u636e\u4ea4\u6362\u30021979\u5e74\u65bd\u8010\u5fb7\u7535\u6c14\u5236\u5b9a\u4e86\u4e00\u4e2a\u7528\u4e8e\u5de5\u4e1a\u73b0\u573a\u7684\u603b\u7ebf\u534f\u8baeModbus\u534f\u8bae\uff0c\u73b0\u5728\u5de5\u4e1a\u4e2d\u4f7f\u7528RS485\u901a\u4fe1\u573a\u5408\u5f88\u591a\u90fd\u91c7\u7528Modbus\u534f\u8bae\u3002\u4f46\u662f\u968f\u7740\u4e2d\u56fd\u65bd\u5de5\u73b0\u573a\u7684\u590d\u6742\u7a0b\u5ea6\uff0cRS485\u82af\u7247\u8d8a\u6765\u8d8a\u4e0d\u9002\u5408\u4e2d\u56fd\u7684\u65bd\u5de5\u73b0\u573a\u4e86\uff0c\u7531\u6b64\u4e5f\u4ea7\u751f\u4e86\u5f88\u591a\u4e2d\u56fd\u7684\u82af\u7247\uff0c\u6765\u9002\u5e94\u4e2d\u56fd\u65bd\u5de5\u73b0\u573a\uff0c\u4f60\u53ef\u4ee5\u770b\u770b\u3002
RS485\u63a5\u53e3\u662f\u4e00\u4e2a\u6807\u51c6\u63a5\u53e3\uff0c\u4e00\u822c\u63a5\u7ebf\u6807\u793a\u4e3aA+ B-\uff0cT/R+ T/R-\u662fRS422\u63a5\u53e3\u7684\u7aef\u5b50\u8868\u793a\uff0c\u6709\u4e9b\u63a5\u53e3\u662f422\u548c485\u516c\u7528\u7684\u3002\u5176\u4e2d\uff0cT/R+\u4ee3\u8868A+\uff0c T/R-\u4ee3\u8868B-\uff0c\u6309\u7167\u8fd9\u4e2a\u63a5\u5c31\u53ef\u4ee5\u3002
\u8d44\u6599\u62d3\u5c55\uff1a
RS-485\u53c8\u540dTIA-485-A, ANSI/TIA/EIA-485\u6216TIA/EIA-485\u3002
RS485\u662f\u4e00\u4e2a\u5b9a\u4e49\u5e73\u8861\u6570\u5b57\u591a\u70b9\u7cfb\u7edf\u4e2d\u7684\u9a71\u52a8\u5668\u548c\u63a5\u6536\u5668\u7684\u7535\u6c14\u7279\u6027\u7684\u6807\u51c6\uff0c\u8be5\u6807\u51c6\u7531\u7535\u4fe1\u884c\u4e1a\u534f\u4f1a\u548c\u7535\u5b50\u5de5\u4e1a\u8054\u76df\u5b9a\u4e49\u3002\u4f7f\u7528\u8be5\u6807\u51c6\u7684\u6570\u5b57\u901a\u4fe1\u7f51\u7edc\u80fd\u5728\u8fdc\u8ddd\u79bb\u6761\u4ef6\u4e0b\u4ee5\u53ca\u7535\u5b50\u566a\u58f0\u5927\u7684\u73af\u5883\u4e0b\u6709\u6548\u4f20\u8f93\u4fe1\u53f7\u3002RS-485\u4f7f\u5f97\u5ec9\u4ef7\u672c\u5730\u7f51\u7edc\u4ee5\u53ca\u591a\u652f\u8def\u901a\u4fe1\u94fe\u8def\u7684\u914d\u7f6e\u6210\u4e3a\u53ef\u80fd\u3002
RS485\u6709\u4e24\u7ebf\u5236\u548c\u56db\u7ebf\u5236\u4e24\u79cd\u63a5\u7ebf\uff0c\u56db\u7ebf\u5236\u53ea\u80fd\u5b9e\u73b0\u70b9\u5bf9\u70b9\u7684\u901a\u4fe1\u65b9\u5f0f\uff0c\u73b0\u5f88\u5c11\u91c7\u7528\uff0c\u73b0\u5728\u591a\u91c7\u7528\u7684\u662f\u4e24\u7ebf\u5236\u63a5\u7ebf\u65b9\u5f0f\uff0c\u8fd9\u79cd\u63a5\u7ebf\u65b9\u5f0f\u4e3a\u603b\u7ebf\u5f0f\u62d3\u6251\u7ed3\u6784\uff0c\u5728\u540c\u4e00\u603b\u7ebf\u4e0a\u6700\u591a\u53ef\u4ee5\u6302\u63a532\u4e2a\u8282\u70b9\u3002
\u5728RS485\u901a\u4fe1\u7f51\u7edc\u4e2d\u4e00\u822c\u91c7\u7528\u7684\u662f\u4e3b\u4ece\u901a\u4fe1\u65b9\u5f0f\uff0c\u5373\u4e00\u4e2a\u4e3b\u673a\u5e26\u591a\u4e2a\u4ece\u673a\u3002\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u8fde\u63a5RS-485\u901a\u4fe1\u94fe\u8def\u65f6\u53ea\u662f\u7b80\u5355\u5730\u7528\u4e00\u5bf9\u53cc\u7ede\u7ebf\u5c06\u5404\u4e2a\u63a5\u53e3\u7684\u201cA\u201d\u3001\u201cB\u201d\u7aef\u8fde\u63a5\u8d77\u6765\uff0c\u800c\u5ffd\u7565\u4e86\u4fe1\u53f7\u5730\u7684\u8fde\u63a5\uff0c\u8fd9\u79cd\u8fde\u63a5\u65b9\u6cd5\u5728\u8bb8\u591a\u573a\u5408\u662f\u80fd\u6b63\u5e38\u5de5\u4f5c\u7684\uff0c\u4f46\u5374\u57cb\u4e0b\u4e86\u5f88\u5927\u7684\u9690\u60a3\uff0c\u539f\u56e01\u662f\u5171\u6a21\u5e72\u6270\uff1aRS-485\u63a5\u53e3\u91c7\u7528\u5dee\u5206\u65b9\u5f0f\u4f20\u8f93\u4fe1\u53f7\u65b9\u5f0f\uff0c\u5e76\u4e0d\u9700\u8981\u76f8\u5bf9\u4e8e\u67d0\u4e2a\u53c2\u7167\u70b9\u6765\u68c0\u6d4b\u4fe1\u53f7\uff0c\u7cfb\u7edf\u53ea\u9700\u68c0\u6d4b\u4e24\u7ebf\u4e4b\u95f4\u7684\u7535\u4f4d\u5dee\u5c31\u53ef\u4ee5\u4e86\uff0c\u4f46\u5bb9\u6613\u5ffd\u89c6\u4e86\u6536\u53d1\u5668\u6709\u4e00\u5b9a\u7684\u5171\u6a21\u7535\u538b\u8303\u56f4\uff0cRS-485\u6536\u53d1\u5668\u5171\u6a21\u7535\u538b\u8303\u56f4\u4e3a-7\u5230+12V\uff0c\u53ea\u6709\u6ee1\u8db3\u4e0a\u8ff0\u6761\u4ef6\uff0c\u6574\u4e2a\u7f51\u7edc\u624d\u80fd\u6b63\u5e38\u5de5\u4f5c\uff1b\u5f53\u7f51\u7edc\u7ebf\u8def\u4e2d\u5171\u6a21\u7535\u538b\u8d85\u51fa\u6b64\u8303\u56f4\u65f6\u5c31\u4f1a\u5f71\u54cd\u901a\u4fe1\u7684\u7a33\u5b9a\u53ef\u9760\uff0c\u751a\u81f3\u635f\u574f\u63a5\u53e3\uff1b\u539f\u56e0\u4e8c\u662fEMI\u7684\u95ee\u9898\uff1a\u53d1\u9001\u9a71\u52a8\u5668\u8f93\u51fa\u4fe1\u53f7\u4e2d\u7684\u5171\u6a21\u90e8\u5206\u9700\u8981\u4e00\u4e2a\u8fd4\u56de\u901a\u8def\uff0c\u5982\u6ca1\u6709\u4e00\u4e2a\u4f4e\u963b\u7684\u8fd4\u56de\u901a\u9053\uff08\u4fe1\u53f7\u5730\uff09\uff0c\u5c31\u4f1a\u4ee5\u8f90\u5c04\u7684\u5f62\u5f0f\u8fd4\u56de\u6e90\u7aef\uff0c\u6574\u4e2a\u603b\u7ebf\u5c31\u4f1a\u50cf\u4e00\u4e2a\u5de8\u5927\u7684\u5929\u7ebf\u5411\u5916\u8f90\u5c04\u7535\u78c1\u6ce2\u3002
\u8d44\u6599\u53c2\u8003\uff1a
RS-485 \u767e\u5ea6\u767e\u79d1
直接上图 自己看情况更改
绛旓細鍙互鐢ㄤ袱绾垮埗鎺ョ嚎銆傛楠ゅ涓嬶細1銆侀鍏堢涓姝ュ氨鏄鐭ラ亾RS485鎺ュ彛鏄涓涓鏍囧噯鎺ュ彛锛屼竴鑸帴绾挎爣绀轰负A+ B-锛孴/R+ T/R-鏄疪S422鎺ュ彛鐨勭瀛愯〃绀猴紝杩欐椂鍊欐敞鎰忕殑鏄湁浜涙帴鍙ｆ槸422鍜485鍏敤鐨勩2銆佹帴鐫灏辨槸RS485涓ょ嚎鍒跺拰鍥涚嚎鍒朵袱绉嶆帴绾匡紝鍥涚嚎鍒跺彧鑳瀹炵幇鐐瑰鐐圭殑閫氫俊鏂瑰紡锛岃繖绉嶆帴绾挎柟寮忎负鎬荤嚎寮忔嫇鎵戠粨鏋勶紝...
绛旓細鍦ㄥ疄闄呭簲鐢ㄤ腑锛RS-485鎺ュ彛閫氬父閲囩敤灞忚斀鍙岀粸绾胯繘琛屼紶杈擄紝杩欑閰嶇疆鑳芥湁鏁堝噺灏戜俊鍙峰共鎵般俁S-485鎺ュ彛鐨勮繛鎺ュ櫒璁捐涓篋B-9鎻掑ご搴э紝鍏朵腑9涓紩鑴氬垎鍒搴旀櫤鑳界粓绔殑RS485鎺ュ彛锛岃繖绉嶆帴鍙ｉ氬父鏄疍B-9鐨勫瓟鍨嬨傚彟涓鏂归潰锛屼笌閿洏杩炴帴鐨勯敭鐩樻帴鍙S485鍒欓噰鐢ㄩ拡鍨嬬殑DB-9鎺ュ彛锛屼互閫傚簲涓嶅悓鐨勮繛鎺ラ渶姹傘
绛旓細鍚堝苟澶氫釜RS485鎺ュ彛杩炴帴鍒涓涓鎺ュ彛涓婄殑鏂规硶鏈変袱绉嶏細涓茶仈杩炴帴鍜屽苟鑱旇繛鎺ャ1. 涓茶仈杩炴帴锛氬皢澶氫釜RS485鎺ュ彛涓茶仈杩炴帴璧锋潵锛屽嵆灏嗕竴涓帴鍙ｇ殑杈撳嚭杩炴帴鍒颁笅涓涓帴鍙ｇ殑杈撳叆銆傝繖鏍峰彲浠ュ皢澶氫釜鎺ュ彛鐨勮緭鍑轰俊鍙蜂覆琛屼紶杈撳埌涓涓帴鍙ｄ笂銆2. 骞惰仈杩炴帴锛氬皢澶氫釜RS485鎺ュ彛骞惰仈杩炴帴璧锋潵锛屽嵆灏嗗涓帴鍙ｇ殑杈撳嚭杩炴帴鍒板悓涓涓荤嚎涓娿傝繖...
绛旓細鍦ㄨ繘琛屽鍙拌澶囩殑RS485閫氫俊鏃讹紝棣栬姝ラ鏄厤缃富閫氫俊绔彛銆傛瘡涓粠璁惧闇瑕佺嫭绔嬬殑閫氫俊鍦板潃锛屽苟鎸夌収鐗瑰畾椤哄簭杩炴帴鍒485鎬荤嚎缃戠粶锛屽舰鎴涓涓鏍囧噯鐨勬荤嚎鎷撴墤锛屾渶澶氭敮鎸32涓妭鐐广傜洰鍓嶏紝澶ч儴鍒嗗簲鐢ㄥ惧悜浜庨噰鐢ㄤ簩绾垮埗鐨凴S485锛岃岄潪鍥涚嚎鍒讹紝鍚庤呬富瑕佺敤浜庣偣瀵圭偣杩炴帴锛屼笖杈冨皯瑙併傚綋涓绘満鍙戦佹暟鎹椂锛屽繀椤诲寘鍚粠璁惧鐨勫湴鍧...
绛旓細浼犵粺鐨485閫氳鏄鎺2鏍归氳绾跨殑锛屾槸涓绉嶅崐鍙屽伐鐨勯氳鏂瑰紡銆備綘鎻愬埌鐨4绾485搴旇鏄鍔犱袱鏉￠氳绾挎潵瀹炵幇鐨勫叏鍙屽伐閫氳锛屼篃灏辨槸RS422鎬荤嚎銆傝屼互涓婃彁鍒扮殑涓ょ閫氳鎬荤嚎鏁伴噺鍙槸閫氳绾跨紗鐨勬暟閲忥紝鍒扮幇鍦烘帴绾胯澶囪繕鏄鍗曠嫭鎺ョ數婧愮嚎鐨勶紝濡傛灉娑夊強鍒板竷绾垮彲浠ヤ簡瑙ｄ笅鍙緵鐢电殑浜屾荤嚎鐨勬柟寮忥紝缁欎綘涓〃鏍间綘鍙互瀵规瘮涓涓...
绛旓細RS485鎺ュ彛鏄涓涓鏍囧噯鎺ュ彛锛屼竴鑸帴绾挎爣绀轰负A+ B-锛孴/R+ T/R-鏄疪S422鎺ュ彛鐨勭瀛愯〃绀猴紝鏈変簺鎺ュ彛鏄422鍜485鍏敤鐨勩傚叾涓紝T/R+浠ｈ〃A+锛 T/R-浠ｈ〃B-锛屾寜鐓ц繖涓帴灏卞彲浠ャ傝祫鏂欐嫇灞曪細RS-485鍙堝悕TIA-485-A, ANSI/TIA/EIA-485鎴朤IA/EIA-485銆俁S485鏄竴涓畾涔夊钩琛℃暟瀛楀鐐圭郴缁熶腑鐨勯┍鍔ㄥ櫒鍜屾帴鏀跺櫒...
绛旓細鐩存帴涓婂浘 鑷繁鐪嬫儏鍐垫洿鏀
绛旓細鍏堜富閫氳鍙璁惧畾锛屽悗鍦ㄥ叾浠栫鍙ｈ瀹氫笉鍚岀殑閫氳鍦板潃锛屽苟璁剧疆閫氳鏃跺簭銆傛惌寤485鎬荤嚎閫氳缃戠粶鍗冲彲銆RS485鏈変袱绾垮埗鍜屽洓绾垮埗涓ょ鎺ョ嚎锛屽洓绾垮埗鍙兘瀹炵幇鐐瑰鐐圭殑閫氫俊鏂瑰紡锛岀幇寰堝皯閲囩敤锛岀幇鍦ㄥ閲囩敤鐨勬槸涓ょ嚎鍒舵帴绾挎柟寮忥紝杩欑鎺ョ嚎鏂瑰紡涓烘荤嚎寮忔嫇鎵戠粨鏋勶紝鍦ㄥ悓涓鎬荤嚎涓婃渶澶氬彲浠ユ寕鎺32涓妭鐐广
绛旓細瑙ｅ喅MODBUS RTU/ACSII閫氳涓笉鑳芥湁涓や釜涓婁綅鏈虹殑闂銆傚皢璇ユā鍧楁帴鍒板涓富鏈轰笌浠庢満涔嬮棿锛岄氳繃璇ユā鍧楃殑淇″彿杞帴锛瀹炵幇涓や釜浠ヤ笂涓绘満鍚屾椂涓庡涓粠鏈虹殑閫氳銆傞噰鐢ㄤ富鏈轰唬鐞嗘柟寮忥細鎵鏈塵odbus涓绘満鍙洿鎺ヤ笌浠ｇ悊涓绘満閫氳锛岀敤鍥涗釜锛堟垨澶氫釜锛RS485/RS232绔彛鍚屾椂涓庡悇涓猰odbus涓绘満閫氳銆備唬鐞嗕富鏈轰粠鍫嗘爤涓寜鍏堣繘鍏堝嚭鍘熷垯...
绛旓細涓鑸湪宸ヤ笟鐢熶骇涓娇鐢ㄧ殑鍏峰RS485鎺ュ彛鐨勮澶囦富瑕佸寘鎷Е鎽稿睆銆佷汉鏈虹晫闈丳LC绛夈傞拡瀵瑰嚑绉嶈澶囩畝鍗曡瑙ｄ竴涓婻S485鏃犵嚎浼犺緭鐨勫叿浣瀹炵幇鏂规硶銆傜敤娉曚竴锛氫笂浣嶆満杞欢鐨凴S485鏃犵嚎浼犺緭 閰嶇數瀹ゅ娓╁強寰幆姘存恫浣嶆棤绾跨洃鎺х郴缁 鍘傚唴闇瑕佹妸鍙樼數鎵銆佸惊鐜按绔欍佺數纾佺珯銆佸洓鏈熷彉鐢垫墍鍏卞洓涓尯鍩熺殑4-20mA淇″彿浠ュ強璁惧宸ヤ綔鐘舵佸拰...
