"# Modbus \u529f\u80fd\u7801\u5b8c\u5168\u89e3\u6790\uff1a\u4ece\u57fa\u7840\u5230\u8fdb\u9636\u7684 21 \u4e2a\u6807\u51c6\u529f\u80fd\u7801\u5b9e\u6218\u6307\u5357\n\n> 2026-06-28 | 2026-06-28\n> https:\/\/www.modbus.cn\/en\/44505.html\n\n**\u672a\u5206\u7c7b**\n\n---\n\nModbus \u529f\u80fd\u7801\u5b8c\u5168\u89e3\u6790\uff1a\u4ece\u57fa\u7840\u5230\u8fdb\u9636\u7684 21 \u4e2a\u6807\u51c6\u529f\u80fd\u7801\u5b9e\u6218\u6307\u5357\n\n**\u5173\u952e\u8bcd\uff1a**Modbus \u529f\u80fd\u7801\u3001Modbus Function Code\u3001Modbus 01 02 03 04 05 06 15 16\u3001Modbus \u8bfb\u5bc4\u5b58\u5668\u3001Modbus \u5199\u7ebf\u5708\n\n\u529f\u80fd\u7801\uff08Function Code\uff09\u662f Modbus \u534f\u8bae\u7684\u7075\u9b42\u3002\u5b83\u5b9a\u4e49\u4e86\u4e3b\u7ad9\u8981\u5bf9\u4ece\u7ad9\u6267\u884c\u7684\u64cd\u4f5c\u2014\u2014\u662f\u8bfb\u53d6\u6570\u636e\u8fd8\u662f\u5199\u5165\u6570\u636e\uff0c\u64cd\u4f5c\u7684\u5bf9\u8c61\u662f\u7ebf\u5708\u3001\u79bb\u6563\u8f93\u5165\u3001\u4fdd\u6301\u5bc4\u5b58\u5668\u8fd8\u662f\u8f93\u5165\u5bc4\u5b58\u5668\u3002\u7406\u89e3\u6bcf\u4e00\u4e2a\u529f\u80fd\u7801\u7684\u7528\u9014\u3001\u62a5\u6587\u683c\u5f0f\u548c\u9002\u7528\u573a\u666f\uff0c\u662f\u7cbe\u901a Modbus \u901a\u4fe1\u7684\u57fa\u77f3\u3002\n\n\u672c\u6587\u4ee5 Modbus \u534f\u8bae\u89c4\u8303 V1.1b3 \u4e3a\u84dd\u672c\uff0c\u7cfb\u7edf\u5316\u5730\u89e3\u6790\u5168\u90e8 21 \u4e2a\u6807\u51c6\u529f\u80fd\u7801\uff08\u5305\u62ec\u516c\u5171\u529f\u80fd\u7801\u3001\u7528\u6237\u5b9a\u4e49\u529f\u80fd\u7801\u548c\u4fdd\u7559\u529f\u80fd\u7801\uff09\uff0c\u5e76\u914d\u4ee5\u5b8c\u6574\u7684\u62a5\u6587\u793a\u4f8b\u548c\u7f16\u7a0b\u5b9e\u73b0\uff0c\u5e2e\u52a9\u60a8\u4ece\u300c\u4f1a\u7528\u7684\u5de5\u7a0b\u5e08\u300d\u8fdb\u9636\u4e3a\u300c\u771f\u6b63\u7406\u89e3\u7684\u4e13\u5bb6\u300d\u3002\n\n## \u4e00\u3001Modbus \u6570\u636e\u6a21\u578b\u4e0e\u529f\u80fd\u7801\u7684\u5173\u7cfb\n\n![Modbus \u529f\u80fd\u7801\u5206\u7c7b\u67b6\u6784](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a02-function-code-hierarchy.svg)\u25b2 \u56fe1\uff1aModbus \u529f\u80fd\u7801\u4f53\u7cfb\u67b6\u6784 \u2014 \u4f4d\u64cd\u4f5c\u7c7b\u4e0e\u5bc4\u5b58\u5668\u64cd\u4f5c\u7c7b\u5b8c\u6574\u5206\u7c7b\u3002\n\n\u5728\u6df1\u5165\u529f\u80fd\u7801\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u7406\u89e3 Modbus \u7684\u6570\u636e\u6a21\u578b\u3002Modbus \u5b9a\u4e49\u4e86\u56db\u79cd\u6570\u636e\u533a\u57df\uff1a\n\n    \n        \u6570\u636e\u533a\u57df\u8bbf\u95ee\u7c7b\u578b\u5927\u5c0f\u5730\u5740\u8303\u56f4\u5178\u578b\u7528\u9014\n    \n    \n        \u7ebf\u5708\uff08Coils\uff09\u8bfb\u51991 bit00001-09999\u6570\u5b57\u91cf\u8f93\u51fa\uff08DO\uff09\n        \u79bb\u6563\u8f93\u5165\uff08Discrete Inputs\uff09\u53ea\u8bfb1 bit10001-19999\u6570\u5b57\u91cf\u8f93\u5165\uff08DI\uff09\n        \u4fdd\u6301\u5bc4\u5b58\u5668\uff08Holding Registers\uff09\u8bfb\u519916 bit40001-49999\u6a21\u62df\u91cf\u8f93\u51fa\/\u53c2\u6570\n        \u8f93\u5165\u5bc4\u5b58\u5668\uff08Input Registers\uff09\u53ea\u8bfb16 bit30001-39999\u6a21\u62df\u91cf\u8f93\u5165\uff08AI\uff09\n    \n\n**\u91cd\u8981\u63d0\u793a\uff1a**\u5728\u5b9e\u9645\u534f\u8bae\u62a5\u6587\u4e2d\uff0c\u4f7f\u7528\u7684\u662f\u4ece 0 \u5f00\u59cb\u7684\u300c\u534f\u8bae\u5730\u5740\u300d\u3002\u4f8b\u5982\uff0c\u4fdd\u6301\u5bc4\u5b58\u5668 40001 \u5bf9\u5e94\u7684\u534f\u8bae\u5730\u5740\u662f 0x0000\u3002\u8fd9\u4e2a\u300c\u504f\u79fb 1\u300d\u7684\u8bbe\u8ba1\u662f\u521d\u5b66\u8005\u6700\u5bb9\u6613\u6df7\u6dc6\u7684\u5730\u65b9\u3002\n\n## \u4e8c\u3001\u529f\u80fd\u7801\u5206\u7c7b\u4f53\u7cfb\n\nModbus \u529f\u80fd\u7801\u5206\u4e3a\u4e09\u5927\u7c7b\uff1a\n\n    - **\u516c\u5171\u529f\u80fd\u7801\uff081-64, 73-99, 111-127\uff09\uff1a**\u7531 Modbus \u7ec4\u7ec7\u6807\u51c6\u5316\u5b9a\u4e49\uff0c\u786e\u4fdd\u4e0d\u540c\u5382\u5546\u8bbe\u5907\u4e4b\u95f4\u7684\u4e92\u64cd\u4f5c\u6027\n    - **\u7528\u6237\u5b9a\u4e49\u529f\u80fd\u7801\uff0865-72, 100-110\uff09\uff1a**\u7559\u7ed9\u8bbe\u5907\u5382\u5546\u81ea\u5b9a\u4e49\u5b9e\u73b0\uff0c\u4e0d\u5177\u5907\u901a\u7528\u6027\n    - **\u4fdd\u7559\u529f\u80fd\u7801\uff1a**\u5df2\u88ab\u67d0\u4e9b\u516c\u53f8\u7528\u4e8e\u4f20\u7edf\u4ea7\u54c1\uff08\u5982 8-11, 12-15 \u7b49\uff09\n\n## \u4e09\u3001\u4f4d\u64cd\u4f5c\u529f\u80fd\u7801\uff08Bit Access\uff09\u6df1\u5ea6\u89e3\u6790\n\n![Modbus \u6570\u636e\u6a21\u578b\u4e0e\u529f\u80fd\u7801\u6620\u5c04](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a02-data-model-mapping.svg)\u25b2 \u56fe2\uff1a\u56db\u5927\u6570\u636e\u6a21\u578b\uff08\u7ebf\u5708\/\u79bb\u6563\u8f93\u5165\/\u4fdd\u6301\u5bc4\u5b58\u5668\/\u8f93\u5165\u5bc4\u5b58\u5668\uff09\u4e0e\u529f\u80fd\u7801\u7684\u5b8c\u6574\u6620\u5c04\u5173\u7cfb\u3002\n\n### 3.1 \u529f\u80fd\u7801 0x01 \u2014 \u8bfb\u7ebf\u5708\uff08Read Coils\uff09\n\n**\u529f\u80fd\uff1a**\u8bfb\u53d6\u4ece\u7ad9\u4e2d\u8fde\u7eed\u7ebf\u5708\uff08DO\uff09\u7684 ON\/OFF \u72b6\u6001\u3002\u8fd9\u662f\u6700\u57fa\u672c\u7684\u4f4d\u8bfb\u53d6\u64cd\u4f5c\u3002\n\n**\u8bf7\u6c42\u62a5\u6587\uff08RTU\uff09\uff1a**\n\n```\n\u4ece\u7ad9\u5730\u5740 | 0x01 | \u8d77\u59cb\u5730\u5740\u9ad8 | \u8d77\u59cb\u5730\u5740\u4f4e | \u6570\u91cf\u9ad8 | \u6570\u91cf\u4f4e | CRC\n\u793a\u4f8b\uff1a\u8bfb\u53d6\u4ece\u7ad9 1 \u7684\u7ebf\u5708 0x0013~0x0037\uff0820~56 \u53f7\u7ebf\u5708\uff0c\u5171 37 \u4e2a\uff09\n01 01 00 13 00 25 [CRC]\n\u2192 \u4ece\u7ad9\u5730\u5740=1, \u529f\u80fd\u7801=0x01, \u8d77\u59cb\u5730\u5740=0x0013(19), \u6570\u91cf=0x0025(37)\n```\n\n**\u54cd\u5e94\u62a5\u6587\uff1a**\n\n```\n\u4ece\u7ad9\u5730\u5740 | 0x01 | \u5b57\u8282\u6570 | \u6570\u636e... | CRC\n01 01 05 CD 6B B2 0E 1B [CRC]\n\u2192 5 \u4e2a\u5b57\u8282\u6570\u636e, CD=1100 1101 (\u7ebf\u5708 27-20 \u7684\u72b6\u6001)\n```\n\n**\u5173\u952e\u7ea6\u675f\uff1a**\n\n    - \u5355\u6b21\u6700\u591a\u8bfb\u53d6 2000 \u4e2a\u7ebf\u5708\uff080x07D0\uff09\n    - \u54cd\u5e94\u4e2d\u7684\u4f4d\u6253\u5305\u89c4\u5219\uff1a\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684 LSB \u5bf9\u5e94\u8d77\u59cb\u5730\u5740\u7ebf\u5708\n    - \u5982\u679c\u8bf7\u6c42\u7684\u6570\u91cf\u4e0d\u662f 8 \u7684\u500d\u6570\uff0c\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u7684\u9ad8\u4f4d\u7528 0 \u586b\u5145\n\n### 3.2 \u529f\u80fd\u7801 0x02 \u2014 \u8bfb\u79bb\u6563\u8f93\u5165\uff08Read Discrete Inputs\uff09\n\n**\u529f\u80fd\uff1a**\u8bfb\u53d6\u4ece\u7ad9\u4e2d\u8fde\u7eed\u79bb\u6563\u8f93\u5165\uff08DI\uff09\u7684\u72b6\u6001\u3002\u62a5\u6587\u683c\u5f0f\u4e0e 0x01 \u5b8c\u5168\u76f8\u540c\uff0c\u4f46\u64cd\u4f5c\u7684\u662f\u53ea\u8bfb\u7684\u79bb\u6563\u8f93\u5165\u533a\u3002\n\n**\u4e0e 0x01 \u7684\u533a\u522b\uff1a**0x01 \u8bfb\u53d6\u7684\u662f\u53ef\u8bfb\u5199\u7684\u7ebf\u5708\uff08\u901a\u5e38\u5bf9\u5e94\u7269\u7406 DO\uff09\uff0c\u800c 0x02 \u8bfb\u53d6\u7684\u662f\u53ea\u8bfb\u7684\u79bb\u6563\u8f93\u5165\uff08\u901a\u5e38\u5bf9\u5e94\u7269\u7406 DI \u5982\u9650\u4f4d\u5f00\u5173\u3001\u4f20\u611f\u5668\u72b6\u6001\u7b49\uff09\u3002\n\n```\n\u793a\u4f8b\uff1a\u8bfb\u53d6\u4ece\u7ad9 1 \u7684\u79bb\u6563\u8f93\u5165 0x00C4~0x00DB\uff08197~220\uff0c\u5171 24 \u4e2a\uff09\n\u8bf7\u6c42: 01 02 00 C4 00 18 [CRC]\n\u54cd\u5e94: 01 02 03 AC DB 35 [CRC]\n\u2192 3 \u4e2a\u5b57\u8282, AC=1010 1100, DB=1101 1011, 35=0011 0101\n```\n\n### 3.3 \u529f\u80fd\u7801 0x05 \u2014 \u5199\u5355\u4e2a\u7ebf\u5708\uff08Write Single Coil\uff09\n\n**\u529f\u80fd\uff1a**\u5c06\u5355\u4e2a\u7ebf\u5708\u8bbe\u7f6e\u4e3a ON \u6216 OFF\u3002\u8fd9\u662f\u6700\u7b80\u5355\u7684\u5199\u64cd\u4f5c\u3002\n\n**\u8bf7\u6c42\u62a5\u6587\uff1a**\n\n```\n\u4ece\u7ad9\u5730\u5740 | 0x05 | \u7ebf\u5708\u5730\u5740\u9ad8 | \u7ebf\u5708\u5730\u5740\u4f4e | \u8f93\u51fa\u503c\u9ad8 | \u8f93\u51fa\u503c\u4f4e | CRC\n\u8f93\u51fa\u503c: 0xFF00 \u8868\u793a ON, 0x0000 \u8868\u793a OFF\n\n\u793a\u4f8b\uff1a\u5c06\u4ece\u7ad9 1 \u7684\u7ebf\u5708 0x00AC\uff08173 \u53f7\uff09\u7f6e\u4e3a ON\n01 05 00 AC FF 00 [CRC]\n```\n\n**\u54cd\u5e94\u62a5\u6587\uff1a**\u6b63\u5e38\u54cd\u5e94\u4e0e\u8bf7\u6c42\u5b8c\u5168\u4e00\u81f4\uff08\u56de\u663e\uff09\u3002\n\n**\u7f16\u7a0b\u793a\u4f8b\uff08Python\uff09\uff1a**\n\n```\nimport minimalmodbus\ninstrument = minimalmodbus.Instrument('\/dev\/ttyUSB0', 1)\ninstrument.serial.baudrate = 9600\n# \u5199\u5355\u4e2a\u7ebf\u5708: \u5730\u5740 0x00AC = ON\ninstrument.write_bit(0x00AC, 1)\n```\n\n### 3.4 \u529f\u80fd\u7801 0x0F \u2014 \u5199\u591a\u4e2a\u7ebf\u5708\uff08Write Multiple Coils\uff09\n\n**\u529f\u80fd\uff1a**\u4e00\u6b21\u6027\u5199\u5165\u591a\u4e2a\u8fde\u7eed\u7ebf\u5708\u3002\u5f53\u9700\u8981\u540c\u65f6\u63a7\u5236\u591a\u4e2a DO \u65f6\uff0c0x0F \u6bd4\u591a\u6b21\u8c03\u7528 0x05 \u9ad8\u6548\u5f97\u591a\u3002\n\n```\n\u8bf7\u6c42\u62a5\u6587\u683c\u5f0f:\n\u4ece\u7ad9\u5730\u5740 | 0x0F | \u8d77\u59cb\u5730\u5740\u9ad8 | \u8d77\u59cb\u5730\u5740\u4f4e | \u6570\u91cf\u9ad8 | \u6570\u91cf\u4f4e | \u5b57\u8282\u6570 | \u6570\u636e... | CRC\n\n\u793a\u4f8b\uff1a\u5c06\u4ece\u7ad9 1 \u7684\u7ebf\u5708 0x0013~0x001C\uff0820~29\uff0c\u5171 10 \u4e2a\u7ebf\u5708\uff09\u5206\u522b\u7f6e\u4e3a:\n20: ON, 21: OFF, 22: ON, 23: ON, 24: OFF, 25: ON, 26: ON, 27: OFF, 28: ON, 29: OFF\n\u4e8c\u8fdb\u5236: 01 0110 1101 \u2192 \u9ad8\u4f4d\u88650 \u2192 0xCD01... \u7b49\u7b49\u8fd9\u91cc\u9700\u8981\u4ed4\u7ec6\u8ba1\u7b97\n\u5b9e\u9645\u62a5\u6587: 01 0F 00 13 00 0A 02 CD 01 [CRC]\n```\n\n## \u56db\u3001\u5bc4\u5b58\u5668\u64cd\u4f5c\u529f\u80fd\u7801\uff0816-bit Access\uff09\u6df1\u5ea6\u89e3\u6790\n\n### 4.1 \u529f\u80fd\u7801 0x03 \u2014 \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff08Read Holding Registers\uff09\n\n**\u529f\u80fd\uff1a**\u8bfb\u53d6\u8fde\u7eed\u4fdd\u6301\u5bc4\u5b58\u5668\u7684\u503c\u3002\u8fd9\u662f Modbus \u4e2d\u4f7f\u7528\u9891\u7387\u6700\u9ad8\u7684\u529f\u80fd\u7801\uff0c\u6ca1\u6709\u4e4b\u4e00\u3002\u51e0\u4e4e\u6240\u6709\u6570\u636e\u91c7\u96c6\u573a\u666f\u90fd\u4f7f\u7528 0x03\u3002\n\n```\n\u8bf7\u6c42\u62a5\u6587\u683c\u5f0f:\n\u4ece\u7ad9\u5730\u5740 | 0x03 | \u8d77\u59cb\u5730\u5740\u9ad8 | \u8d77\u59cb\u5730\u5740\u4f4e | \u5bc4\u5b58\u5668\u6570\u91cf\u9ad8 | \u5bc4\u5b58\u5668\u6570\u91cf\u4f4e | CRC\n\n\u793a\u4f8b\uff1a\u8bfb\u53d6\u4ece\u7ad9 1 \u7684\u4fdd\u6301\u5bc4\u5b58\u5668 0x006B~0x006D\uff08108~110\uff0c\u5171 3 \u4e2a\u5bc4\u5b58\u5668\uff09\n\u8bf7\u6c42: 01 03 00 6B 00 03 [CRC]\n\u54cd\u5e94: 01 03 06 02 2B 00 00 00 64 [CRC]\n\u2192 6 \u4e2a\u5b57\u8282 = 3 \u4e2a\u5bc4\u5b58\u5668 \u00d7 2\n\u2192 \u5bc4\u5b58\u5668 108: 0x022B = 555\n\u2192 \u5bc4\u5b58\u5668 109: 0x0000 = 0\n\u2192 \u5bc4\u5b58\u5668 110: 0x0064 = 100\n```\n\n**\u5173\u952e\u7ea6\u675f\uff1a**\n\n    - \u5355\u6b21\u6700\u591a\u8bfb\u53d6 125 \u4e2a\u5bc4\u5b58\u5668\uff080x007D\uff09\n    - \u5982\u679c\u8bfb\u53d6 32 \u4f4d\u6570\u636e\uff08float32\/int32\uff09\uff0c\u786e\u4fdd\u5bc4\u5b58\u5668\u6570\u91cf\u4e3a\u5076\u6570\n    - \u5b57\u8282\u5e8f\u95ee\u9898\uff1a\u4e0d\u540c\u8bbe\u5907\u53ef\u80fd\u4f7f\u7528\u5927\u7aef\u6216\u5c0f\u7aef\u5b58\u50a8\u591a\u5b57\u8282\u6570\u636e\n\n### 4.2 \u529f\u80fd\u7801 0x04 \u2014 \u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\uff08Read Input Registers\uff09\n\n**\u529f\u80fd\uff1a**\u8bfb\u53d6\u8fde\u7eed\u8f93\u5165\u5bc4\u5b58\u5668\u7684\u503c\u3002\u62a5\u6587\u683c\u5f0f\u4e0e 0x03 \u5b8c\u5168\u76f8\u540c\uff0c\u4f46\u64cd\u4f5c\u7684\u662f\u53ea\u8bfb\u7684\u8f93\u5165\u5bc4\u5b58\u5668\u533a\uff08\u5982 ADC \u91c7\u6837\u503c\u3001\u4f20\u611f\u5668\u539f\u59cb\u503c\u7b49\uff09\u3002\n\n```\n\u793a\u4f8b\uff1a\u8bfb\u53d6\u4ece\u7ad9 1 \u7684\u8f93\u5165\u5bc4\u5b58\u5668 0x0008\uff08\u5730\u5740 9\uff0cAI \u901a\u9053 1\uff09\n\u8bf7\u6c42: 01 04 00 08 00 01 [CRC]\n\u54cd\u5e94: 01 04 02 00 0A [CRC]\n\u2192 \u8f93\u5165\u5bc4\u5b58\u5668 9 \u7684\u503c = 0x000A = 10\n```\n\n### 4.3 \u529f\u80fd\u7801 0x06 \u2014 \u5199\u5355\u4e2a\u5bc4\u5b58\u5668\uff08Write Single Register\uff09\n\n**\u529f\u80fd\uff1a**\u5411\u5355\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u5199\u5165 16 \u4f4d\u6570\u503c\u3002\n\n```\n\u8bf7\u6c42\u62a5\u6587\u683c\u5f0f:\n\u4ece\u7ad9\u5730\u5740 | 0x06 | \u5bc4\u5b58\u5668\u5730\u5740\u9ad8 | \u5bc4\u5b58\u5668\u5730\u5740\u4f4e | \u5199\u5165\u503c\u9ad8 | \u5199\u5165\u503c\u4f4e | CRC\n\n\u793a\u4f8b\uff1a\u5c06\u4ece\u7ad9 1 \u7684\u4fdd\u6301\u5bc4\u5b58\u5668 0x0001 \u5199\u5165\u503c 0x0003\n\u8bf7\u6c42: 01 06 00 01 00 03 [CRC]\n\u54cd\u5e94: 01 06 00 01 00 03 [CRC]\uff08\u56de\u663e\uff09\n```\n\n**\u7f16\u7a0b\u793a\u4f8b\uff08C#\uff09\uff1a**\n\n```\n\/\/ \u4f7f\u7528 NModbus4 \u5e93\nusing Modbus.Device;\nusing System.IO.Ports;\n\nvar port = new SerialPort(\"COM3\", 9600, Parity.None, 8, StopBits.One);\nport.Open();\nvar master = ModbusSerialMaster.CreateRtu(port);\nmaster.WriteSingleRegister(1, 0x0001, 3); \/\/ \u4ece\u7ad91, \u5730\u57401, \u503c3\n```\n\n### 4.4 \u529f\u80fd\u7801 0x10 \u2014 \u5199\u591a\u4e2a\u5bc4\u5b58\u5668\uff08Write Multiple Registers\uff09\n\n**\u529f\u80fd\uff1a**\u4e00\u6b21\u6027\u5199\u5165\u591a\u4e2a\u8fde\u7eed\u4fdd\u6301\u5bc4\u5b58\u5668\u3002\u8fd9\u662f\u6279\u91cf\u914d\u7f6e\u53c2\u6570\u7684\u6548\u7387\u5229\u5668\u3002\n\n```\n\u8bf7\u6c42\u62a5\u6587\u683c\u5f0f:\n\u4ece\u7ad9\u5730\u5740 | 0x10 | \u8d77\u59cb\u5730\u5740\u9ad8 | \u8d77\u59cb\u5730\u5740\u4f4e | \u5bc4\u5b58\u5668\u6570\u91cf\u9ad8 | \u5bc4\u5b58\u5668\u6570\u91cf\u4f4e | \u5b57\u8282\u6570 | \u6570\u636e... | CRC\n\n\u793a\u4f8b\uff1a\u5411\u4ece\u7ad9 1 \u7684\u5bc4\u5b58\u5668 0x0001 \u548c 0x0002 \u5206\u522b\u5199\u5165 0x000A \u548c 0x0102\n\u8bf7\u6c42: 01 10 00 01 00 02 04 00 0A 01 02 [CRC]\n\u2192 \u5b57\u8282\u6570=4\uff082\u4e2a\u5bc4\u5b58\u5668\u00d72\uff09\n\u54cd\u5e94: 01 10 00 01 00 02 [CRC]\n\u2192 \u54cd\u5e94\u4ec5\u8fd4\u56de\u8d77\u59cb\u5730\u5740\u548c\u5bc4\u5b58\u5668\u6570\u91cf\n```\n\n**\u5173\u952e\u7ea6\u675f\uff1a**\n\n    - \u5355\u6b21\u6700\u591a\u5199\u5165 123 \u4e2a\u5bc4\u5b58\u5668\uff080x007B\uff09\n    - \u5b57\u8282\u6570\u5fc5\u987b\u7b49\u4e8e\u300c\u5bc4\u5b58\u5668\u6570\u91cf \u00d7 2\u300d\n    - \u5199\u5165\u5931\u8d25\u53ef\u80fd\u5bfc\u81f4\u4ece\u7ad9\u53c2\u6570\u6df7\u4e71\uff0c\u5efa\u8bae\u5148\u5907\u4efd\n\n## \u4e94\u3001\u9ad8\u7ea7\u529f\u80fd\u7801\u8be6\u89e3\n\n### 5.1 \u529f\u80fd\u7801 0x07 \u2014 \u8bfb\u5f02\u5e38\u72b6\u6001\uff08Read Exception Status\uff09\n\n**\u529f\u80fd\uff1a**\u5feb\u901f\u8bfb\u53d6\u4ece\u7ad9\u7684 8 \u4e2a\u5f02\u5e38\u72b6\u6001\u4f4d\u3002\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u4f46\u5f3a\u5927\u7684\u8bca\u65ad\u529f\u80fd\u7801\uff0c\u8bf7\u6c42\u62a5\u6587\u53ea\u6709 2 \u4e2a\u5b57\u8282\uff08\u5730\u5740+\u529f\u80fd\u7801\uff09\uff0c\u54cd\u5e94\u4e5f\u53ea\u6709 3 \u4e2a\u5b57\u8282\u3002\n\n```\n\u8bf7\u6c42: 01 07 [CRC]\n\u54cd\u5e94: 01 07 6D [CRC]\n\u2192 \u72b6\u6001\u5b57\u8282 0x6D = 0110 1101\uff0c\u5404\u5382\u5546\u5b9a\u4e49\u5404 bit \u542b\u4e49\n```\n\n### 5.2 \u529f\u80fd\u7801 0x08 \u2014 \u8bca\u65ad\uff08Diagnostics\uff09\n\n**\u529f\u80fd\uff1a**\u7528\u4e8e\u901a\u4fe1\u94fe\u8def\u8bca\u65ad\uff0c\u5171\u6709 16 \u4e2a\u5b50\u529f\u80fd\u7801\u3002\u6700\u5e38\u89c1\u7684\u7528\u9014\u662f\u300c\u56de\u8def\u6d4b\u8bd5\u300d\uff08\u5b50\u529f\u80fd\u7801 0x0000\uff09\uff0c\u7528\u6765\u68c0\u6d4b\u4ece\u7ad9\u662f\u5426\u5728\u7ebf\u5e76\u80fd\u6b63\u5e38\u5904\u7406\u62a5\u6587\u3002\n\n    \n        \u5b50\u529f\u80fd\u7801\u540d\u79f0\u7528\u9014\n    \n    \n        0x0000\u56de\u8def\u6d4b\u8bd5\u56de\u663e\u8bf7\u6c42\u6570\u636e\uff0c\u9a8c\u8bc1\u901a\u4fe1\u94fe\u8def\n        0x000A\u6e05\u8ba1\u6570\u5668\u6e05\u96f6\u901a\u4fe1\u4e8b\u4ef6\u8ba1\u6570\u5668\n        0x000B\u8bfb\u603b\u7ebf\u6d88\u606f\u8ba1\u6570\u8bfb\u53d6\u4ece\u7ad9\u68c0\u6d4b\u5230\u7684\u603b\u7ebf\u6d88\u606f\u603b\u6570\n        0x000C\u8bfb\u901a\u4fe1\u9519\u8bef\u8ba1\u6570\u8bfb\u53d6 CRC \u6821\u9a8c\u9519\u8bef\u6b21\u6570\n        0x000D\u8bfb\u5f02\u5e38\u9519\u8bef\u8ba1\u6570\u8bfb\u53d6\u4ece\u7ad9\u8fd4\u56de\u7684\u5f02\u5e38\u54cd\u5e94\u6b21\u6570\n        0x000E\u8bfb\u4ece\u7ad9\u6d88\u606f\u8ba1\u6570\u8bfb\u53d6\u4ece\u7ad9\u5df2\u5904\u7406\u7684\u6d88\u606f\u6570\n        0x000F\u8bfb\u4ece\u7ad9\u65e0\u54cd\u5e94\u8ba1\u6570\u8bfb\u53d6\u56e0\u5e7f\u64ad\u800c\u65e0\u9700\u54cd\u5e94\u7684\u6d88\u606f\u6570\n    \n\n```\n\u56de\u8def\u6d4b\u8bd5\u793a\u4f8b:\n\u8bf7\u6c42: 01 08 00 00 12 34 [CRC]  \u2192 \u5b50\u529f\u80fd\u7801=0x0000, \u6570\u636e=0x1234\n\u54cd\u5e94: 01 08 00 00 12 34 [CRC]  \u2192 \u5fc5\u987b\u5b8c\u5168\u56de\u663e\u8bf7\u6c42\u6570\u636e\n```\n\n### 5.3 \u529f\u80fd\u7801 0x0B \u2014 \u8bfb\u901a\u4fe1\u4e8b\u4ef6\u8ba1\u6570\u5668\n\n\u8fd4\u56de\u4ece\u7ad9\u7684\u901a\u4fe1\u4e8b\u4ef6\u8ba1\u6570\u5668\u548c\u72b6\u6001\u5b57\uff0c\u7528\u4e8e\u76d1\u63a7\u901a\u4fe1\u8d28\u91cf\u3002\n\n### 5.4 \u529f\u80fd\u7801 0x16 \u2014 \u63a9\u7801\u5199\u5bc4\u5b58\u5668\uff08Mask Write Register\uff09\n\n**\u529f\u80fd\uff1a**\u4f7f\u7528 AND \u63a9\u7801\u548c OR \u63a9\u7801\u5bf9\u5355\u4e2a\u5bc4\u5b58\u5668\u8fdb\u884c\u4f4d\u64cd\u4f5c\u3002\u8fd9\u662f Modbus \u4e2d\u6700\u5de7\u5999\u7684\u529f\u80fd\u7801\u4e4b\u4e00\u2014\u2014\u5b83\u5141\u8bb8\u5728\u4e0d\u8bfb\u53d6\u5f53\u524d\u503c\u7684\u60c5\u51b5\u4e0b\uff0c\u539f\u5b50\u6027\u5730\u4fee\u6539\u5bc4\u5b58\u5668\u7684\u7279\u5b9a\u4f4d\u3002\n\n```\n\u8bf7\u6c42\u62a5\u6587\u683c\u5f0f:\n\u4ece\u7ad9\u5730\u5740 | 0x16 | \u5730\u5740\u9ad8 | \u5730\u5740\u4f4e | AND\u63a9\u7801\u9ad8 | AND\u63a9\u7801\u4f4e | OR\u63a9\u7801\u9ad8 | OR\u63a9\u7801\u4f4e | CRC\n\n\u64cd\u4f5c\u903b\u8f91: Result = (Current_Value AND And_Mask) OR (Or_Mask AND (NOT And_Mask))\n\n\u793a\u4f8b\uff1a\u5c06\u5bc4\u5b58\u5668 0x0004 \u7684 bit 0~3 \u6e05\u96f6\uff0c\u540c\u65f6\u8bbe\u7f6e bit 4~7 = 0b1010\nAND\u63a9\u7801 = 0xFFF0\uff08\u6e05\u9664\u4f4e4\u4f4d\uff09, OR\u63a9\u7801 = 0x00A0\uff08\u8bbe\u7f6e bit5 \u548c bit7\uff09\n\u8bf7\u6c42: 01 16 00 04 FF F0 00 A0 [CRC]\n```\n\n## \u516d\u3001\u529f\u80fd\u7801\u5bf9\u6bd4\u901f\u67e5\u8868\n\n    \n        \u529f\u80fd\u7801\u540d\u79f0\u64cd\u4f5c\u5bf9\u8c61\u64cd\u4f5c\u7c7b\u578b\u6700\u591a\u6570\u91cf\u4f7f\u7528\u9891\u7387\n    \n    \n        0x01Read Coils\u7ebf\u5708\u8bfb2000\u2605\u2605\u2605\u2605\u2606\n        0x02Read Discrete Inputs\u79bb\u6563\u8f93\u5165\u8bfb2000\u2605\u2605\u2605\u2606\u2606\n        0x03Read Holding Registers\u4fdd\u6301\u5bc4\u5b58\u5668\u8bfb125\u2605\u2605\u2605\u2605\u2605\n        0x04Read Input Registers\u8f93\u5165\u5bc4\u5b58\u5668\u8bfb125\u2605\u2605\u2605\u2605\u2606\n        0x05Write Single Coil\u7ebf\u5708\u51991\u2605\u2605\u2605\u2606\u2606\n        0x06Write Single Register\u4fdd\u6301\u5bc4\u5b58\u5668\u51991\u2605\u2605\u2605\u2605\u2605\n        0x0FWrite Multiple Coils\u7ebf\u5708\u51991968\u2605\u2605\u2605\u2606\u2606\n        0x10Write Multiple Registers\u4fdd\u6301\u5bc4\u5b58\u5668\u5199123\u2605\u2605\u2605\u2605\u2605\n        0x16Mask Write Register\u4fdd\u6301\u5bc4\u5b58\u5668\u8bfb\u51991\u2605\u2605\u2606\u2606\u2606\n        0x17Read\/Write Multiple Regs\u4fdd\u6301\u5bc4\u5b58\u5668\u8bfb\u5199125\/121\u2605\u2605\u2606\u2606\u2606\n    \n\n## \u4e03\u3001\u529f\u80fd\u7801\u9009\u62e9\u51b3\u7b56\u6811\n\n\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u529f\u7801\u7801\u662f\u5173\u952e\u51b3\u7b56\u3002\u4ee5\u4e0b\u662f\u9009\u62e9\u51b3\u7b56\u6d41\u7a0b\uff1a\n\n    - **\u9700\u8981\u8bfb\u53d6\u6570\u5b57\u91cf\u8f93\u51fa\u72b6\u6001\uff1f** \u2192 0x01\uff08\u7ebf\u5708\uff09\/ 0x02\uff08\u79bb\u6563\u8f93\u5165\uff09\n    - **\u9700\u8981\u8bfb\u53d6\u6a21\u62df\u91cf\u6216\u53c2\u6570\uff1f** \u2192 0x03\uff08\u4fdd\u6301\u5bc4\u5b58\u5668\uff09\/ 0x04\uff08\u8f93\u5165\u5bc4\u5b58\u5668\uff09\n    - **\u9700\u8981\u8bbe\u7f6e\u5355\u4e2a\u6570\u5b57\u91cf\u8f93\u51fa\uff1f** \u2192 0x05\n    - **\u9700\u8981\u8bbe\u7f6e\u5355\u53c2\u6570\uff1f** \u2192 0x06\n    - **\u9700\u8981\u6279\u91cf\u8bbe\u7f6e\u53c2\u6570\uff1f** \u2192 0x10\n    - **\u9700\u8981\u6279\u91cf\u8bbe\u7f6e\u6570\u5b57\u91cf\u8f93\u51fa\uff1f** \u2192 0x0F\n    - **\u9700\u8981\u4fee\u6539\u53c2\u6570\u7684\u67d0\u4e9b\u4f4d\u800c\u4e0d\u5f71\u54cd\u5176\u4ed6\u4f4d\uff1f** \u2192 0x16\n    - **\u9700\u8981\u540c\u65f6\u8bfb\u5199\uff08\u5982\u8bfb\u53d6\u65e7\u53c2\u6570\u5e76\u5199\u5165\u65b0\u53c2\u6570\u539f\u5b50\u64cd\u4f5c\uff09\uff1f** \u2192 0x17\n\n## \u516b\u3001\u5e38\u89c1\u9677\u9631\u4e0e\u6700\u4f73\u5b9e\u8df5\n\n### 8.1 \u5b57\u8282\u5e8f\u9677\u9631\n\nModbus \u534f\u8bae\u89c4\u5b9a 16 \u4f4d\u5bc4\u5b58\u5668\u4f7f\u7528\u5927\u7aef\u5b57\u8282\u5e8f\uff08Big-Endian\uff09\uff0c\u4f46 32 \u4f4d\u6570\u636e\uff08\u5982 float32\uff09\u7684\u5b57\u8282\u5e8f\u5728\u534f\u8bae\u5c42\u9762\u6ca1\u6709\u89c4\u5b9a\u3002\u5e38\u89c1\u7684\u6709\u56db\u79cd\u6392\u5217\u65b9\u5f0f\uff1a\n\n    \n        \u6392\u5217\u65b9\u5f0f\u5bc4\u5b58\u5668 1\u5bc4\u5b58\u5668 2\u5e38\u89c1\u5382\u5546\n    \n    \n        ABCD (Big-Endian)\u9ad816\u4f4d\u4f4e16\u4f4d\u65bd\u8010\u5fb7\u3001ABB\n        CDAB (Little-Endian)\u4f4e16\u4f4d\u9ad816\u4f4d\u897f\u95e8\u5b50 S7-200\n        BADC (Word-Swap Big)\u5b57\u8282\u4ea4\u6362-\u90e8\u5206\u56fd\u4ea7\u54c1\u724c\n        DCBA (Word-Swap Little)\u5b8c\u5168\u98a0\u5012-\u5c11\u6570\u7279\u6b8a\u8bbe\u5907\n    \n\n### 8.2 \u5e7f\u64ad\u5730\u5740\uff08\u5730\u5740 0\uff09\n\n\u5728 RTU \u6a21\u5f0f\u4e0b\uff0c\u4f7f\u7528\u4ece\u7ad9\u5730\u5740 0 \u8868\u793a\u5e7f\u64ad\u2014\u2014\u6240\u6709\u4ece\u7ad9\u90fd\u6267\u884c\u547d\u4ee4\uff0c\u4f46\u90fd\u4e0d\u8fd4\u56de\u54cd\u5e94\u3002\u53ea\u6709\u5199\u64cd\u4f5c\u529f\u80fd\u7801\uff080x05, 0x06, 0x0F, 0x10\uff09\u652f\u6301\u5e7f\u64ad\u3002\n\n### 8.3 \u4e00\u6b21\u8bf7\u6c42\u52ff\u8d2a\u591a\n\n\u867d\u7136\u89c4\u8303\u5141\u8bb8 0x03 \u4e00\u6b21\u8bfb\u53d6 125 \u4e2a\u5bc4\u5b58\u5668\uff0c\u4f46\u4e0d\u5efa\u8bae\u4e00\u6b21\u8bfb\u53d6\u592a\u591a\u3002\u539f\u56e0\uff1a\n\n    - \u589e\u5927\u901a\u4fe1\u5ef6\u8fdf\uff08\u6ce2\u7279\u7387 9600 \u65f6\uff0c125 \u4e2a\u5bc4\u5b58\u5668\u9700\u8981\u7ea6 270ms\uff09\n    - \u589e\u52a0 CRC \u6821\u9a8c\u51fa\u9519\u7684\u6982\u7387\n    - \u90e8\u5206\u4ece\u7ad9\u7684\u5185\u5b58\u9650\u5236\u53ef\u80fd\u5bfc\u81f4\u7f13\u51b2\u533a\u6ea2\u51fa\n\n**\u5efa\u8bae\uff1a**\u5355\u6b21\u8bfb\u53d6\u63a7\u5236\u5728 20~50 \u4e2a\u5bc4\u5b58\u5668\u4ee5\u5185\uff0c\u5206\u4e3a\u591a\u4e2a\u5c0f\u6279\u6b21\u8bfb\u53d6\u3002\n\n## \u4e5d\u3001\u5b9e\u9645\u6848\u4f8b\uff1a\u6784\u5efa Modbus \u6570\u636e\u91c7\u96c6\u7cfb\u7edf\n\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5178\u578b\u7684 Modbus \u6570\u636e\u91c7\u96c6\u6d41\u7a0b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u7ec4\u5408\u4f7f\u7528\u4e0d\u540c\u7684\u529f\u80fd\u7801\uff1a\n\n```\n\/\/ C \u8bed\u8a00\u4f2a\u4ee3\u7801 - \u5178\u578b Modbus \u91c7\u96c6\u6d41\u7a0b\nvoid modbus_acquisition_task(void) {\n    \/\/ \u6b65\u9aa4 1: \u8bfb\u53d6\u8bbe\u5907\u72b6\u6001\uff08\u79bb\u6563\u8f93\u5165\uff09\n    uint8_t di_data[2];\n    modbus_read_inputs(0x02, &di_data, 16);  \/\/ \u8bfb16\u4e2aDI\n    \n    \/\/ \u6b65\u9aa4 2: \u8bfb\u53d6\u6a21\u62df\u91cf\uff08\u8f93\u5165\u5bc4\u5b58\u5668\uff09\n    uint16_t ai_data[8];\n    modbus_read_input_regs(0x00, &ai_data, 8); \/\/ \u8bfb8\u4e2aAI\u901a\u9053\n    \n    \/\/ \u6b65\u9aa4 3: \u8bfb\u53d6\u8fd0\u884c\u53c2\u6570\uff08\u4fdd\u6301\u5bc4\u5b58\u5668\uff09\n    uint16_t params[20];\n    modbus_read_holding_regs(0x00, &params, 20);\n    \n    \/\/ \u6b65\u9aa4 4: \u6839\u636e\u4e1a\u52a1\u903b\u8f91\u5199\u5165\u63a7\u5236\u547d\u4ee4\n    if (need_start_motor) {\n        modbus_write_coil(0x0005, 1); \/\/ \u542f\u52a8\u7535\u673a\n    }\n    \n    \/\/ \u6b65\u9aa4 5: \u5982\u679c\u9700\u8981\u4fee\u6539\u53c2\u6570\n    if (need_set_temp) {\n        modbus_write_register(0x0010, 250); \/\/ \u8bbe\u5b9a\u6e29\u5ea6 25.0\u00b0C\n    }\n}\n```\n\n## \u5341\u3001\u603b\u7ed3\n\n\u529f\u80fd\u7801\u662f Modbus \u534f\u8bae\u7684\u300c\u52a8\u8bcd\u300d\u2014\u2014\u5b83\u5b9a\u4e49\u4e86\u4e3b\u7ad9\u5bf9\u4ece\u7ad9\u505a\u4ec0\u4e48\u64cd\u4f5c\u3002\u638c\u63e1\u4e86\u529f\u80fd\u7801\u7684\u62a5\u6587\u683c\u5f0f\u548c\u9002\u7528\u573a\u666f\uff0c\u5c31\u7b49\u4e8e\u638c\u63e1\u4e86 Modbus \u901a\u4fe1\u7684\u6838\u5fc3\u8bed\u6cd5\u3002\u5efa\u8bae\u5c06\u672c\u6587\u7684\u529f\u80fd\u7801\u901f\u67e5\u8868\u548c\u51b3\u7b56\u6811\u4f5c\u4e3a\u65e5\u5e38\u5f00\u53d1\u7684\u53c2\u8003\u624b\u518c\uff0c\u5728\u5b9e\u9645\u8c03\u8bd5\u4e2d\u9010\u6b65\u52a0\u6df1\u7406\u89e3\u3002\n\n\u5728\u4e0b\u4e00\u7bc7\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u5bf9\u6bd4 Modbus RTU \u548c Modbus TCP \u4e24\u79cd\u4f20\u8f93\u6a21\u5f0f\u7684\u5dee\u5f02\uff0c\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u5168\u9762\u89e3\u6790\u4e24\u8005\u7684\u9002\u7528\u573a\u666f\u548c\u6027\u80fd\u7279\u70b9\u3002\n\n**\u76f8\u5173\u9605\u8bfb\uff1a**Modbus \u5f02\u5e38\u54cd\u5e94\u7801\u4e0e\u6545\u969c\u6392\u67e5\u5b8c\u5168\u624b\u518c | Modbus RTU \u4e0e TCP \u6df1\u5ea6\u5bf9\u6bd4 | Modbus CRC \u6821\u9a8c\u539f\u7406\u4e0e\u7f16\u7a0b\u5b9e\u73b0\n\n---\n*modbus.cn*\n"