"# ModBus RTU\u901a\u8baf\u534f\u8bae\u5e38\u89c1\u95ee\u9898\u6c47\u603b\n\n> 2022-03-15 | 2023-10-29\n> https:\/\/www.modbus.cn\/en\/6709.html\n\n**Modbus \u534f\u8bae\u6807\u51c6, Modbus\u6280\u672f\u6587\u6863**\n\n---\n\n**\u4e00\u3001ModBus RTU\u901a\u8baf\u534f\u8bae\u4e0eModBus\u901a\u8baf\u534f\u8bae\u6709\u4ec0\u4e48\u533a\u522b\uff1f**\n\nModBus\u534f\u8bae\u662f\u5e94\u7528\u5c42\u62a5\u6587\u4f20\u8f93\u534f\u8bae\uff08OSI\u6a21\u578b\u7b2c7\u5c42\uff09\uff0c\u5b83\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e0e\u901a\u4fe1\u5c42\u65e0\u5173\u7684\u534f\u8bae\u6570\u636e\u5355\u5143\uff08PDU\uff09\uff0c\u5373PDU=\u529f\u80fd\u7801+\u6570\u636e\u57df\u3002\n\nModBus\u534f\u8bae\u80fd\u591f\u5e94\u7528\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u603b\u7ebf\u6216\u7f51\u7edc\u3002\u5bf9\u5e94\u4e0d\u540c\u7684\u603b\u7ebf\u6216\u7f51\u7edc\uff0cModbus\u534f\u8bae\u5f15\u5165\u4e00\u4e9b\u9644\u52a0\u57df\u6620\u5c04\u6210\u5e94\u7528\u6570\u636e\u5355\u5143\uff08ADU\uff09\uff0c\u5373ADU=\u9644\u52a0\u57df+PDU\u3002\u76ee\u524d\uff0cModbus\u6709\u4e0b\u5217\u4e09\u79cd\u901a\u4fe1\u65b9\u5f0f\uff1a\n\n1.\u4ee5\u592a\u7f51\uff0c\u5bf9\u5e94\u7684\u901a\u4fe1\u6a21\u5f0f\u662fMODBUS TCP\u3002\n\n2.\u5f02\u6b65\u4e32\u884c\u4f20\u8f93\uff08\u5404\u79cd\u4ecb\u8d28\u5982\u6709\u7ebfRS-232-\/422\/485\/\uff1b\u5149\u7ea4\u3001\u65e0\u7ebf\u7b49\uff09\uff0c\u5bf9\u5e94\u7684\u901a\u4fe1\u6a21\u5f0f\u662fMODBUS RTU\u6216MODBUS ASCII\u3002\n\n3.\u9ad8\u901f\u4ee4\u724c\u4f20\u9012\u7f51\u7edc\uff0c\u5bf9\u5e94\u7684\u901a\u4fe1\u6a21\u5f0f\u662fModbus PLUS\u3002\n\n**\u4e8c\u3001\u5173\u4e8eMODBUS RTU\u901a\u8baf\u534f\u8bae\u7684\u63d0\u95ee\uff1f**\n\nmodbus \u4e3b\u8981\u7531\u7ad9\u5730\u5740\uff08\u4e00\u4e2a\u5b57\u8282\uff09+\u529f\u80fd\u7801\uff08\u4e00\u4e2a\u5b57\u8282\uff09+\u9996\u5730\u5740\uff08\u4e24\u4e2a\u5b57\u8282\uff09+\u8bbf\u95ee\u5b57\u6570\uff08\u4e24\u4e2a\u5b57\u8282\uff09+\u6821\u9a8c\u7801\uff08CRC16\u6216LRC\u4e24\u4e2a\u5b57\u8282\uff09\u603b\u51718\u4e2a\u5b57\u8282\u7ec4\u6210\u3002\u5176\u5b9eVB\u4e2d\u7f16\u7a0b\u5f88\u7b80\u5355\u4ece\u7ec4\u5efa\u6dfb\u52a0MSComm\u7ec4\u5efa\u5c31\u884c\u4e86\uff0c\u96be\u7684\u662f\u6821\u9a8c\uff0c\n\n**\u4e09\u3001modbus\u3001rtu\u3001modbusrtu\u5206\u522b\u662f\u4ec0\u4e48\uff1f**\n\nmodbus\u534f\u8bae\u662f\u5de5\u63a7\u884c\u4e1a\u7684\u6807\u51c6\u534f\u8bae\uff0c\u524d\u8eab\u4e3a\u83ab\u8fea\u5eb7\u6240\u5199\uff0c\u73b0\u5df2\u88ab\u65bd\u5948\u5fb7\u6536\u8d2d\u3002\n\n\u800cmodbus\u5206\u4e3a\u4e24\u79cd\u534f\u8bae\uff1a\u5373\u4e32\u53e3\u534f\u8bae\uff08modbusrtu\uff09\u548c\u7f51\u53e3\u534f\u8bae\uff08modbus tcp\uff09\u534f\u8bae\uff0c\u4e00\u822c\u7684\u5de5\u63a7\u673a\u53ea\u652f\u6301rs232\u6216\u8005RS485\u7684\u4e32\u53e3\u6a21\u5f0f\uff0c\u8fd9\u4e2a\u65f6\u5019\u5de5\u63a7\u673a\u7684\u534f\u8bae\u6808\u91cc\u5c31\u53ea\u6709modbus RTU\u534f\u8bae\uff0c\u5f53\u4ed6\u4ece\u4e32\u53e3\u63a5\u6536\u5230\u6570\u636e\u65f6,\u4f1a\u76f4\u63a5\u6839\u636e\u62a5\u6587\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u63a7\u5236\uff0c\u5982\u679c\u9700\u8981\u7528modbus TCP\u534f\u8bae\u8fdb\u884c\u4f20\u8f93\uff0c\u5219\u9700\u8981\u4f7f\u7528\u5e26\u6709\u7f51\u53e3\u7684PLC\u3002\n\n\u5177\u4f53\u7684\u5e27\u683c\u5f0f\u5982\u4e0b\uff1a\n\nmodbus RTU \u5730\u5740\u57df \u529f\u80fd\u7801 \u6570\u636e \u5dee\u9519\u6821\u9a8c\n\nmodbus TCP \u76ee\u7684\u5730\u5740 \u534f\u8baeid \u957f\u5ea6 \u5355\u5143\u53f7 \u529f\u80fd\u7801 \u6570\u636e\n\n\u7b80\u5355\u7684\u8bf4 tcp\u662f\u7531RTU\u52a0\u5de5\u800c\u6765\u7684\uff0c\u800cRTU\u5219\u662f\u53e6\u5916\u4e00\u79cd\u6982\u5ff5\uff0c\u4e0d\u5305\u542b\u5728modus\u534f\u8bae\u5185\uff0c\u662f\u5de5\u63a7\u884c\u4e1a\u5bf9\u76d1\u63a7\u8bbe\u5907\u7684\u7b80\u79f0\u3002\n\n**\u56db\u3001\u5173\u4e8emodbus_RTU\u534f\u8bae\u4e3b\u673a\u53d1\u9001\u7684\u547d\u4ee4\u7684\u4e00\u4e9b\u95ee\u9898**\n\n01 \u8bfb\u4fdd\u6301\u7ebf\u5708\u72b6\u6001\uff08Read coil status\uff09\n\n02 \u8bfb\u8f93\u5165\u7ebf\u5708\u72b6\u6001\uff08Read input status\uff09\n\n03 \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff08Read holding register\uff09\n\n04 \u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\uff08Read input register\uff09\n\n05 \u5199\u5355\u4e2a\u7ebf\u5708\uff08Force single coil\uff09\n\n06 \u5199\u5355\u4e2a\u5bc4\u5b58\u5668\uff08Preset single register\uff09\n\n15 \u5199\u591a\u4e2a\u7ebf\u5708\uff08Force multiple coils\uff09\n\n16 \u5199\u591a\u4e2a\u5bc4\u5b58\u5668\uff08Preset multiple registers\uff09\n\n\u8fd9\u4e9b\u90fd\u662f\u4ec0\u4e48\u610f\u601d\n\n\u7b54\uff1a01 \u8bfb\u53d6\u903b\u8f91\u7ebf\u5708\u7ec4\u72b6\u6001\n\n02 \u8bfb\u53d6\u79bb\u6563\u91cf\u7ebf\u5708\u7ec4\u72b6\u6001\n\n03 \u8bfb\u53d6\u4e00\u4e2a\u6216\u591a\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u503c\n\n04 \u8bfb\u53d6\u4e00\u4e2a\u6216\u591a\u4e2a\u8f93\u5165\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u503c\n\n05 \u6539\u53d8\u903b\u8f91\u7ebf\u5708\u72b6\u6001\n\n06 \u6539\u53d8\u5355\u4e2a\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u503c\n\n15 \u6539\u53d8\u591a\u4e2a\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u503c\n\n16 \u6307\u5b9a\u591a\u4e2a\u64cd\u6301\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u503c\n\n**\u4e94\u3001OPC \u8f6cmodbus RTU \u65b9\u5f0f \u6211\u73b0\u5728\u6709\u4e00\u4e2aOPC\u670d\u52a1\u5668\uff0c\u91cc\u9762\u5f88\u591atag\uff0ctag\u662fAB\u91cc\u51fa\u6765\u7684\uff0c\u600e\u4e48\u5c06tag\u8fde\u5230modbus\uff1f**\n\nProfibus\u3001Fielbus\u3001Modbus\u3001CC-link\u7b49\u7b49\u662f\u5404\u4e2dPLC\u786c\u4ef6\u652f\u6301\u7684\u901a\u8baf\u534f\u8bae\uff0c\u8fd9\u4e2a\u662f\u5404\u5382\u5546\u7684\u786c\u4ef6\u5c5e\u6027\u4e00\u6837\uff0e\u53ea\u662f\u73b0\u5728\u8ba1\u7b97\u673a\u7ec4\u6001\u8f6f\u4ef6\u90fd\u652f\u6301\u5f88\u591a\u79cd\u534f\u8bae\u7684PLC\uff0e\u4f60\u7406\u89e3\u53cd\u4e86\u3002\n\nProfibus\u3001Fielbus\u3001Modbus\u3001CC-link\u8fd9\u4e9b\u534f\u8bae\uff0c\u662f\u4e00\u79cd\u901a\u8baf\u534f\u8bae\uff0c\u4e00\u822c\u4e0d\u9700\u8981\u4f60\u53bb\u7f16\u7a0b\uff0c\u5c31\u597d\u8c61\u4f60\u4f7f\u7528\u8ba1\u7b97\u673a\uff0c\u4f60\u4e0d\u9700\u8981\u7f16\u5199IP\u534f\u8bae\u4e00\u6837\uff0c\u53ea\u662f\u8981\u9075\u5faa\u5b83\u3002\n\n\u9075\u5faa\u7684\u610f\u601d\u5c31\u662f\uff0c\u4f60\u5fc5\u987b\u6309\u7167\u8be5\u5382\u5bb6\u6240\u652f\u6301\u7684\u534f\u8bae\u5728PLC\u6216\u8005DCS\u786c\u4ef6\u7ec4\u6001\u7684\u65f6\u5019\u6309\u7167\u8be5\u901a\u8baf\u534f\u8bae\u8bbe\u7f6e\u786c\u4ef6\uff0e\u5176\u5b9e\u8fd9\u4e2a\u5f88\u7b80\u5355\uff0e \u8fd9\u91cc\u7b80\u5355\u6307\u7684\u662f\uff0c\u4f60\u5b66\u7f16\u7a0b\uff0c\u91cd\u70b9\u662f\u7f16\u5199\u6267\u884c\u63a7\u5236\u7684\u52a8\u4f5c\u7684\u7a0b\u5e8f\uff0c\u786c\u4ef6\u901a\u8baf\u534f\u8bae\u4e0d\u9700\u8981\u4f60\u81ea\u5df1\u52a8\u624b\u5199\u3002\n\n**\u516d\u3001\u4ec0\u4e48\u662fmodbus rtu master\uff1f**\n\n\u5c31\u662f\u9009RTU\u6a21\u5f0f\uff0c\u56e0\u4e3aMODBUS\u5206\u4e3aASCII\u6a21\u5f0f\u548cRTU\u6a21\u5f0f\uff0cMASER\u5c31\u662f\u8bbe\u7f6e\u4e3a\u4e3b\u7ad9\uff0c\u4e00\u822c\u4e3aPLC\u7aef\uff0c\u53d8\u9891\u5668\u8bbe\u4e3a\u4ece\u7ad9\uff0c\u8fd8\u8981\u6ce8\u610f\u4e3b\u7ad9\u548c\u4ece\u7ad9\u5730\u5740\u7684\u8bbe\u7f6e\u3002\n\n**\u4e03\u3001Modbus rtu \u4e3a\u4ec0\u4e48\u6ca1\u6709\u5f00\u59cb\u548c\u7ed3\u675f\u6807\u8bb0\uff1f**\n\n\u7531\u4e8eModbus rtu\u5e27\u7684\u6bcf\u4e2a\u5b57\u8282\u662f16\u8fdb\u5236\u6570\uff0c\u6570\u503c\u8303\u56f4\u572800~FF\uff0c\u82e5\u50cfModbusASCII\u90a3\u6837\u752802\u300103\u8868\u793a\u5f00\u59cb\u548c\u7ed3\u675f\u6807\u8bb0\uff0c\u5219\u4e0e\u6570\u503c2\u30013\u53d1\u751f\u51b2\u7a81\uff0c\u65e0\u6cd5\u5224\u65ad\u5176\u662f\u6807\u8bb0\u8fd8\u662f\u6570\u503c\uff0c\u65e0\u6cd5\u6570\u636e\u89e3\u5305\u3002\n\n**\u516b\u3001modbus tcp \u5230 rtu\u7684\u8f6c\u6362\uff1f**\n\n\u8bf7\u4ed4\u7ec6\u67e5\u770b\u5e27\u683c\u5f0f\uff1a\n\nmodbusRTU \u5730\u5740\u57df \u529f\u80fd\u7801 \u6570\u636e \u5dee\u9519\u6821\u9a8c\n\nmodbusTCP \u76ee\u7684\u5730\u5740 \u534f\u8baeid \u957f\u5ea6 \u5355\u5143\u53f7 \u529f\u80fd\u7801 \u6570\u636e\n\n\u5199\u4e00\u4e2aTCP\u8f6cRTU\u7684\u7a0b\u5e8f\u653e\u5230\u8bbe\u5907\u91cc\u505amodbus\u7f51\u6865\u5373\u53ef\n\n**\u4e5d\u3001MODBUS RTU\u901a\u8baf\u7ebf\u88ab\u70e7\uff1f**\n\n\u7528\u4e07\u7528\u8868\u91cf\u4e00\u4e0b\u51fa\u6765\u7684\u901a\u8baf\u7ebf\uff0c\u7535\u538b\u4e0d\u8d85\u8fc75V\u5e94\u8be5\u6ca1\u95ee\u9898\uff0c\u4e00\u822c\u4e0d\u4f1a\u70e7\u4e1c\u897f\uff0c\u63a5\u7684\u65f6\u5019\u533a\u5206\u6b63\u548c\u8d1f\u3002\u5f88\u591a\u4ea7\u54c1B\u662f\u6b63\uff0c\u91cf\u4e00\u4e0b\u770b\u770b\u3002\n\n**\u5341\u3001\u89e6\u6478\u5c4fmodbus rtu\u600e\u4e48\u8bbe\u7f6e\uff1f**\n\n\u4e00\u822c\u662f\u901a\u8fc7\u5b8f\u6307\u4ee4\u81ea\u5df1\u7f16\u7a0b\u5b9e\u73b0\uff0c\u5f53\u7136\u4e5f\u6709\u652f\u6301RTU\u7684\uff0c\u5728\u901a\u8baf\u7c7b\u578b\u83dc\u5355\n\n**\u5341\u4e00\u3001MODBUS RTU\u534f\u8bae\u4e2d\u6d6e\u70b9\u6570\u662f\u5982\u4f55\u5b58\u50a8,\u8bfb\u5230\u6d6e\u70b9\u6570\u5bc4\u5b58\u5668\u7684\u6570\u503c\u5982\u4f55\u8f6c\u6362\u6210\u6240\u9700\u7684\u6d6e\u70b9\u6570\uff1f**\n\n\u6d6e\u70b9\u6570\u4fdd\u5b58\u7684\u5b57\u8282\u683c\u5f0f\u5982\u4e0b\uff1a\n\n\u5730\u5740 +0 +1 +2 +3\n\n\u5185\u5bb9 SEEE EEEE EMMM MMMM MMMM MMMM MMMM MMMM\n\n\u8fd9\u91ccS \u4ee3\u8868\u7b26\u53f7\u4f4d\uff0c1\u662f\u8d1f\uff0c0\u662f\u6b63\n\nE \u504f\u79fb127\u7684\u5e42\uff0c\u4e8c\u8fdb\u5236\u9636\u7801=\uff08EEEEEEEE\uff09-127\u3002\n\nM24\u4f4d\u7684\u5c3e\u6570\u4fdd\u5b58\u572823\u4f4d\u4e2d\uff0c\u53ea\u5b58\u50a823\u4f4d\uff0c\u6700\u9ad8\u4f4d\u56fa\u5b9a\u4e3a1\u3002\u6b64\u65b9\u6cd5\u7528\u6700\u8f83\u5c11\u7684\u4f4d\u6570\u5b9e\u73b0\u4e86\u8f83\u9ad8\u7684\u6709\u6548\u4f4d\u6570\uff0c\u63d0\u9ad8\u4e86\u7cbe\u5ea6\u3002\u96f6\u662f\u4e00\u4e2a\u7279\u5b9a\u503c\uff0c\u5e42\u662f0 \u5c3e\u6570\u4e5f\u662f0\u3002\n\n\u6d6e\u70b9\u6570-12.5\u4f5c\u4e3a\u4e00\u4e2a\u5341\u516d\u8fdb\u5236\u65700xC1480000\u4fdd\u5b58\u5728\u5b58\u50a8\u533a\u4e2d\uff0c\u8fd9\u4e2a\u503c\u5982\u4e0b\uff1a\n\n\u5730\u5740 +0 +1 +2 +3\n\n\u5185\u5bb90xC1 0x48 0x00 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