"# Modbus \u5f02\u5e38\u54cd\u5e94\u7801\u4e0e\u6545\u969c\u6392\u67e5\u5b8c\u5168\u624b\u518c\uff1a\u4ece 01 \u5230 11 \u7684\u5b8c\u6574\u89e3\u6790\n\n> 2026-06-28 | 2026-06-28\n> https:\/\/www.modbus.cn\/en\/44503.html\n\n**\u672a\u5206\u7c7b**\n\n---\n\nModbus \u5f02\u5e38\u54cd\u5e94\u7801\u4e0e\u6545\u969c\u6392\u67e5\u5b8c\u5168\u624b\u518c\uff1a\u4ece 01 \u5230 11 \u7684\u5b8c\u6574\u89e3\u6790\n\n**\u5173\u952e\u8bcd\uff1a**Modbus \u5f02\u5e38\u7801\u3001Modbus \u6545\u969c\u6392\u67e5\u3001Modbus \u9519\u8bef\u7801\u3001Modbus Exception Code\u3001Modbus \u901a\u4fe1\u6545\u969c\n\n\u5728\u5de5\u4e1a\u81ea\u52a8\u5316\u73b0\u573a\uff0cModbus \u901a\u4fe1\u6545\u969c\u662f\u6700\u8ba9\u5de5\u7a0b\u5e08\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u3002\u5f53\u4e3b\u7ad9\u53d1\u51fa\u8bf7\u6c42\u540e\uff0c\u4ece\u7ad9\u8fd4\u56de\u7684\u4e0d\u662f\u6b63\u5e38\u6570\u636e\uff0c\u800c\u662f\u4e00\u4e2a\u300c\u5f02\u5e38\u54cd\u5e94\u300d\u2014\u2014\u8fd9\u8868\u660e\u901a\u4fe1\u94fe\u8def\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u4e1a\u52a1\u903b\u8f91\u5c42\u51fa\u73b0\u4e86\u9519\u8bef\u3002\u7406\u89e3\u6bcf\u4e00\u4e2a\u5f02\u5e38\u7801\u7684\u542b\u4e49\u3001\u89e6\u53d1\u6761\u4ef6\u548c\u6392\u67e5\u65b9\u6cd5\uff0c\u662f\u6bcf\u4e00\u4f4d\u81ea\u52a8\u5316\u5de5\u7a0b\u5e08\u7684\u5fc5\u4fee\u8bfe\u3002\n\n\u672c\u6587\u5c06\u4ece Modbus \u534f\u8bae\u89c4\u8303\uff08V1.1b3\uff09\u51fa\u53d1\uff0c\u7ed3\u5408\u771f\u5b9e\u5de5\u4e1a\u73b0\u573a\u6848\u4f8b\uff0c\u6df1\u5165\u89e3\u6790\u5168\u90e8 11 \u4e2a\u6807\u51c6\u5f02\u5e38\u7801\u7684\u89e6\u53d1\u673a\u5236\u3001\u6392\u67e5\u6d41\u7a0b\u548c\u89e3\u51b3\u65b9\u6848\u3002\u65e0\u8bba\u60a8\u662f\u521d\u6b21\u63a5\u89e6 Modbus \u7684\u65b0\u624b\uff0c\u8fd8\u662f\u5e0c\u671b\u7cfb\u7edf\u5316\u68b3\u7406\u77e5\u8bc6\u7684\u8001\u5175\uff0c\u90fd\u80fd\u4ece\u672c\u6587\u4e2d\u627e\u5230\u5b9e\u7528\u7684\u53c2\u8003\u3002\n\n## \u4e00\u3001Modbus \u5f02\u5e38\u54cd\u5e94\u7684\u57fa\u672c\u673a\u5236\n\n![Modbus \u5f02\u5e38\u54cd\u5e94\u5e27\u7ed3\u6784](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a01-exception-frame.svg)\u25b2 \u56fe1\uff1a\u6b63\u5e38\u8bf7\u6c42\u5e27\u4e0e\u5f02\u5e38\u54cd\u5e94\u5e27\u683c\u5f0f\u5bf9\u6bd4\u3002\u5f02\u5e38\u65f6\u529f\u80fd\u7801\u6700\u9ad8\u4f4d\u7f6e1\uff08+0x80\uff09\uff0c\u7d27\u8ddf1\u5b57\u8282\u5f02\u5e38\u7801\u3002\n\n### 1.1 \u6b63\u5e38\u54cd\u5e94 vs \u5f02\u5e38\u54cd\u5e94\n\n\u5728 Modbus \u534f\u8bae\u4e2d\uff0c\u4e3b\u7ad9\uff08Master\/Client\uff09\u5411\u4ece\u7ad9\uff08Slave\/Server\uff09\u53d1\u9001\u8bf7\u6c42\u62a5\u6587\uff0c\u4ece\u7ad9\u5904\u7406\u540e\u8fd4\u56de\u54cd\u5e94\u62a5\u6587\u3002\u5f53\u4e00\u5207\u6b63\u5e38\u65f6\uff0c\u54cd\u5e94\u7684\u529f\u80fd\u7801\u4e0e\u8bf7\u6c42\u7684\u529f\u80fd\u7801\u5b8c\u5168\u4e00\u81f4\uff1a\n\n```\n\u8bf7\u6c42: [\u4ece\u7ad9\u5730\u5740] [\u529f\u80fd\u7801 0x03] [\u8d77\u59cb\u5730\u5740\u9ad8\u5b57\u8282] [\u8d77\u59cb\u5730\u5740\u4f4e\u5b57\u8282] [\u5bc4\u5b58\u5668\u6570\u91cf\u9ad8\u5b57\u8282] [\u5bc4\u5b58\u5668\u6570\u91cf\u4f4e\u5b57\u8282] [CRC\u4f4e] [CRC\u9ad8]\n\u6b63\u5e38\u54cd\u5e94: [\u4ece\u7ad9\u5730\u5740] [\u529f\u80fd\u7801 0x03] [\u5b57\u8282\u6570] [\u6570\u636e...] [CRC\u4f4e] [CRC\u9ad8]\n```\n\n\u5f53\u4ece\u7ad9\u65e0\u6cd5\u6b63\u5e38\u5904\u7406\u8bf7\u6c42\u65f6\uff0c\u5b83\u4f1a\u5c06\u529f\u80fd\u7801\u7684\u6700\u9ad8\u4f4d\uff08bit 7\uff09\u7f6e\u4e3a 1\uff0c\u5e76\u5728\u6570\u636e\u533a\u653e\u5165\u4e00\u4e2a\u5b57\u8282\u7684\u5f02\u5e38\u7801\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c**\u5f02\u5e38\u529f\u80fd\u7801 = \u8bf7\u6c42\u529f\u80fd\u7801 + 0x80**\u3002\u4f8b\u5982\uff0c\u8bf7\u6c42\u529f\u80fd\u7801 0x03 \u51fa\u73b0\u5f02\u5e38\u65f6\uff0c\u54cd\u5e94\u529f\u80fd\u7801\u53d8\u4e3a 0x83\u3002\n\n```\n\u5f02\u5e38\u54cd\u5e94\u62a5\u6587\u7ed3\u6784\uff08RTU \u6a21\u5f0f\uff09:\n[\u4ece\u7ad9\u5730\u5740] [\u529f\u80fd\u7801+0x80] [\u5f02\u5e38\u7801] [CRC\u4f4e] [CRC\u9ad8]\n\n\u793a\u4f8b - \u8bf7\u6c42\u4e0d\u5b58\u5728\u7684\u5bc4\u5b58\u5668\u5730\u5740:\n\u8bf7\u6c42: 01 03 27 10 00 01 [CRC]\n\u5f02\u5e38\u54cd\u5e94: 01 83 02 [CRC]  \n\u2192 \u529f\u80fd\u7801 0x83 = 0x03 + 0x80\uff0c\u5f02\u5e38\u7801 0x02 = \u975e\u6cd5\u6570\u636e\u5730\u5740\n```\n\n### 1.2 \u5f02\u5e38\u54cd\u5e94\u7684\u5224\u65ad\u903b\u8f91\n\n![Modbus \u901a\u4fe1\u6545\u969c\u6392\u67e5\u51b3\u7b56\u6811](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a01-troubleshooting-tree.svg)\u25b2 \u56fe2\uff1a\u901a\u4fe1\u6545\u969c\u6392\u67e5\u51b3\u7b56\u6811 \u2014 \u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u7cfb\u7edf\u5316\u8bca\u65ad\u6d41\u7a0b\u3002\n\n\u5f53\u60a8\u5728\u8c03\u8bd5\u5de5\u5177\uff08\u5982 Modbus Poll\u3001ModScan\uff09\u4e2d\u770b\u5230\u4ece\u7ad9\u8fd4\u56de\u7684\u6570\u636e\u65f6\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u5f02\u5e38\u54cd\u5e94\u975e\u5e38\u7b80\u5355\uff1a\n\n    - \u67e5\u770b\u54cd\u5e94\u529f\u80fd\u7801\u662f\u5426\u5927\u4e8e 0x80\uff08\u5373\u6700\u9ad8\u4f4d\u4e3a 1\uff09\n    - \u5982\u679c\u529f\u80fd\u7801 > 0x80\uff0c\u5219\u7b2c\u4e8c\u4e2a\u5b57\u8282\u5373\u4e3a\u5f02\u5e38\u7801\n    - \u6839\u636e\u5f02\u5e38\u7801\u67e5\u8868\u786e\u5b9a\u9519\u8bef\u7c7b\u578b\n\n\u5728\u7f16\u7a0b\u5b9e\u73b0\u4e2d\uff0c\u68c0\u6d4b\u903b\u8f91\u5982\u4e0b\uff1a\n\n```\n\/\/ C \u8bed\u8a00\u5f02\u5e38\u54cd\u5e94\u68c0\u6d4b\u793a\u4f8b\nif (response_function_code & 0x80) {\n    uint8_t exception_code = response_data[0];\n    switch (exception_code) {\n        case 0x01: \/\/ \u975e\u6cd5\u529f\u80fd\u7801\n        case 0x02: \/\/ \u975e\u6cd5\u6570\u636e\u5730\u5740\n        case 0x03: \/\/ \u975e\u6cd5\u6570\u636e\u503c\n        \/\/ ... \u5176\u4ed6\u5f02\u5e38\u7801\u5904\u7406\n    }\n}\n```\n\n## \u4e8c\u300111 \u4e2a\u6807\u51c6\u5f02\u5e38\u7801\u5b8c\u5168\u89e3\u6790\n\nModbus \u534f\u8bae\u89c4\u8303\u5b9a\u4e49\u4e86 11 \u4e2a\u6807\u51c6\u5f02\u5e38\u7801\uff080x01 ~ 0x0B\uff09\u3002\u4e0b\u9762\u9010\u4e00\u6df1\u5ea6\u89e3\u6790\u6bcf\u4e2a\u5f02\u5e38\u7801\u7684\u542b\u4e49\u3001\u89e6\u53d1\u6761\u4ef6\u3001\u5178\u578b\u573a\u666f\u548c\u6392\u67e5\u65b9\u6cd5\u3002\n\n### \u5f02\u5e38\u7801 0x01 \u2014 \u975e\u6cd5\u529f\u80fd\uff08Illegal Function\uff09\n\n![Modbus \u6807\u51c6\u5f02\u5e38\u7801\u901f\u67e5\u8868](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a01-exception-classification.svg)\u25b2 \u56fe3\uff1a8\u79cd\u6807\u51c6\u5f02\u5e38\u7801\u901f\u67e5\u8868 \u2014 \u4e00\u8868\u638c\u63e1\u6240\u6709\u5f02\u5e38\u539f\u56e0\u4e0e\u89e3\u51b3\u65b9\u6848\u3002\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u4e0d\u652f\u6301\u8bf7\u6c42\u7684\u529f\u80fd\u7801\u3002\u8fd9\u662f\u6700\u5e38\u89c1\u7684\u5f02\u5e38\u7801\u4e4b\u4e00\uff0c\u901a\u5e38\u53d1\u751f\u5728\u4e3b\u7ad9\u4f7f\u7528\u4e86\u4ece\u7ad9\u672a\u5b9e\u73b0\u7684\u529f\u80fd\u7801\u65f6\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u529f\u80fd\u7801\u8d85\u51fa\u8303\u56f4\uff1a**\u4e3b\u7ad9\u53d1\u9001\u4e86\u529f\u80fd\u7801 0x14\uff08\u8bfb\u6587\u4ef6\u8bb0\u5f55\uff09\uff0c\u4f46\u4ece\u7ad9\u53ea\u5b9e\u73b0\u4e86 0x03\u30010x04\u30010x06\u30010x10\n    - **PLC \u578b\u53f7\u4e0d\u652f\u6301\uff1a**\u90e8\u5206\u4f4e\u7aef PLC \u53ea\u652f\u6301 0x03 \u548c 0x06\uff0c\u5c1d\u8bd5\u4f7f\u7528 0x10\uff08\u5199\u591a\u4e2a\u5bc4\u5b58\u5668\uff09\u4f1a\u8fd4\u56de 0x01\n    - **\u8bbe\u5907\u914d\u7f6e\u9519\u8bef\uff1a**\u67d0\u4e9b\u8bbe\u5907\u7684 Modbus \u5b9e\u73b0\u901a\u8fc7\u914d\u7f6e\u5f00\u5173\u542f\u7528\/\u7981\u7528\u529f\u80fd\u7801\uff0c\u5982\u679c\u5bf9\u5e94\u529f\u80fd\u88ab\u7981\u7528\uff0c\u540c\u6837\u8fd4\u56de 0x01\n    - **\u7f51\u5173\u8f6c\u6362\u95ee\u9898\uff1a**Modbus TCP \u5230 RTU \u7684\u7f51\u5173\u53ef\u80fd\u4e0d\u652f\u6301\u67d0\u4e9b\u529f\u80fd\u7801\u7684\u900f\u4f20\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u67e5\u9605\u8bbe\u5907\u624b\u518c\uff0c\u786e\u8ba4\u4ece\u7ad9\u652f\u6301\u54ea\u4e9b\u529f\u80fd\u7801\n    - \u4f7f\u7528 Modbus Poll \u7b49\u5de5\u5177\u9010\u4e00\u6d4b\u8bd5\u529f\u80fd\u7801\uff0c\u7f29\u5c0f\u95ee\u9898\u8303\u56f4\n    - \u68c0\u67e5\u7f51\u5173\/\u8f6c\u6362\u5668\u7684\u529f\u80fd\u7801\u8fc7\u6ee4\u914d\u7f6e\n    - \u5982\u679c\u4f7f\u7528\u81ea\u7814\u7a0b\u5e8f\uff0c\u786e\u8ba4\u529f\u80fd\u7801\u5e38\u91cf\u5b9a\u4e49\u662f\u5426\u6b63\u786e\n\n**\u5b9e\u9645\u6848\u4f8b\uff1a**\u67d0\u6c34\u5904\u7406\u9879\u76ee\u4e2d\uff0c\u4e0a\u4f4d\u673a\u4f7f\u7528\u529f\u80fd\u7801 0x17\uff08\u8bfb\/\u5199\u591a\u4e2a\u5bc4\u5b58\u5668\uff09\u64cd\u4f5c\u65bd\u8010\u5fb7 PM800 \u7535\u529b\u4eea\u8868\uff0c\u59cb\u7ec8\u8fd4\u56de\u5f02\u5e38\u7801 0x01\u3002\u7ecf\u67e5\u624b\u518c\u53d1\u73b0 PM800 \u53ea\u652f\u6301 0x03 \u548c 0x10\u3002\u89e3\u51b3\u65b9\u6848\uff1a\u62c6\u5206\u4e3a\u5148 0x03 \u8bfb\u53d6\u3001\u518d 0x10 \u5199\u5165\u4e24\u6b65\u64cd\u4f5c\u3002\n\n### \u5f02\u5e38\u7801 0x02 \u2014 \u975e\u6cd5\u6570\u636e\u5730\u5740\uff08Illegal Data Address\uff09\n\n**\u542b\u4e49\uff1a**\u8bf7\u6c42\u7684\u5bc4\u5b58\u5668\u5730\u5740\u5728\u4ece\u7ad9\u4e2d\u4e0d\u5b58\u5728\u3002\u8fd9\u662f\u5de5\u7a0b\u5e08\u5728\u8c03\u8bd5\u9636\u6bb5\u6700\u5bb9\u6613\u9047\u5230\u7684\u5f02\u5e38\u7801\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u5730\u5740\u504f\u79fb\u9519\u8bef\uff1a**PLC \u7684 Modbus \u5730\u5740\u901a\u5e38\u4ece 0 \u5f00\u59cb\uff0c\u4f46\u4e0a\u4f4d\u673a\u914d\u7f6e\u65f6\u53ef\u80fd\u586b\u4e86 1 \u8d77\u59cb\u7684\u5730\u5740\n    - **\u5bc4\u5b58\u5668\u8303\u56f4\u8d8a\u754c\uff1a**\u8bf7\u6c42\u7684\u8d77\u59cb\u5730\u5740 + \u6570\u91cf\u8d85\u51fa\u4e86\u4ece\u7ad9\u7684\u6700\u5927\u5bc4\u5b58\u5668\u8303\u56f4\n    - **\u5730\u5740\u6620\u5c04\u9519\u8bef\uff1a**\u6709\u4e9b\u8bbe\u5907\u4f7f\u7528\u4e0d\u540c\u7684\u5730\u5740\u6620\u5c04\u8868\uff08\u5982\u6709\u4e9b\u8bbe\u5907 40001 \u5bf9\u5e94\u5185\u90e8\u5730\u5740 0\uff0c\u6709\u4e9b\u5bf9\u5e94 1\uff09\n    - **\u6570\u636e\u7c7b\u578b\u6df7\u6dc6\uff1a**32 \u4f4d\u6d6e\u70b9\u6570\u5360\u7528 2 \u4e2a\u5bc4\u5b58\u5668\uff0c\u5982\u679c\u53ea\u8bf7\u6c42 1 \u4e2a\u5bc4\u5b58\u5668\uff0c\u53ef\u80fd\u89e6\u53d1\u8d8a\u754c\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u4f7f\u7528 0x03 \u529f\u80fd\u7801\uff0c\u4ece\u5730\u5740 0 \u5f00\u59cb\u9010\u4e00\u8bfb\u53d6\uff0c\u786e\u5b9a\u6709\u6548\u5730\u5740\u8303\u56f4\n    - \u786e\u8ba4\u8bbe\u5907\u624b\u518c\u4e2d\u7684\u5730\u5740\u662f\u300c\u534f\u8bae\u5730\u5740\u300d\u8fd8\u662f\u300cPLC \u5730\u5740\u300d\u2014\u2014\u4e24\u8005\u53ef\u80fd\u76f8\u5dee 1\n    - \u5bf9\u4e8e 32 \u4f4d\u6570\u636e\uff0c\u786e\u4fdd\u8bf7\u6c42\u7684\u5bc4\u5b58\u5668\u6570\u91cf\u4e3a\u5076\u6570\n    - \u68c0\u67e5\u62a5\u6587\u4e2d\u5730\u5740\u7684\u5927\u5c0f\u7aef\u5b57\u8282\u5e8f\u662f\u5426\u6b63\u786e\n\n### \u5f02\u5e38\u7801 0x03 \u2014 \u975e\u6cd5\u6570\u636e\u503c\uff08Illegal Data Value\uff09\n\n**\u542b\u4e49\uff1a**\u8bf7\u6c42\u4e2d\u7684\u6570\u503c\u5728\u4ece\u7ad9\u7684\u5141\u8bb8\u8303\u56f4\u4e4b\u5916\u3002\u8fd9\u4e0d\u6d89\u53ca\u5730\u5740\u95ee\u9898\uff0c\u800c\u662f\u300c\u503c\u300d\u7684\u95ee\u9898\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u5199\u5165\u503c\u8d85\u51fa\u8303\u56f4\uff1a**\u6e29\u5ea6\u8bbe\u5b9a\u503c\u8303\u56f4\u4e3a 0~100\u00b0C\uff0c\u4f46\u4e3b\u7ad9\u5199\u5165\u4e86 150\n    - **\u5bc4\u5b58\u5668\u6570\u91cf\u4e0d\u5408\u6cd5\uff1a**0x10 \u529f\u80fd\u7801\u7684\u300c\u5bc4\u5b58\u5668\u6570\u91cf\u300d\u5b57\u6bb5\u4e3a 0 \u6216\u8d85\u8fc7\u4e86\u4ece\u7ad9\u5355\u6b21\u53ef\u5904\u7406\u7684\u6700\u5927\u503c\uff08\u901a\u5e38\u4e3a 123\uff09\n    - **\u5b57\u8282\u6570\u4e0d\u5339\u914d\uff1a**0x10 \u529f\u80fd\u7801\u7684\u300c\u5b57\u8282\u6570\u300d\u5b57\u6bb5\u4e0e\u300c\u5bc4\u5b58\u5668\u6570\u91cf \u00d7 2\u300d\u4e0d\u4e00\u81f4\n    - **\u62a5\u6587\u957f\u5ea6\u9519\u8bef\uff1a**\u6574\u4e2a\u62a5\u6587\u7684\u5b9e\u9645\u957f\u5ea6\u4e0e\u62a5\u5934\u4e2d\u58f0\u660e\u7684\u957f\u5ea6\u4e0d\u7b26\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u91cd\u70b9\u68c0\u67e5 0x10\uff08\u5199\u591a\u4e2a\u5bc4\u5b58\u5668\uff09\u7684\u62a5\u6587\u7ed3\u6784\u2014\u2014\u8fd9\u662f\u6700\u5bb9\u6613\u51fa\u9519\u7684\u573a\u666f\n    - \u9a8c\u8bc1\u300c\u5b57\u8282\u6570 = \u5bc4\u5b58\u5668\u6570\u91cf \u00d7 2\u300d\u662f\u5426\u6210\u7acb\n    - \u786e\u8ba4\u5199\u5165\u503c\u662f\u5426\u5728\u8bbe\u5907\u624b\u518c\u89c4\u5b9a\u7684\u8303\u56f4\u5185\n    - \u5bf9\u4e8e 0x06\uff08\u5199\u5355\u4e2a\u5bc4\u5b58\u5668\uff09\uff0c\u68c0\u67e5\u5199\u5165\u503c\u7684\u8303\u56f4\uff080x0000 ~ 0xFFFF\uff09\n\n### \u5f02\u5e38\u7801 0x04 \u2014 \u4ece\u7ad9\u8bbe\u5907\u6545\u969c\uff08Slave Device Failure\uff09\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u5728\u5904\u7406\u8bf7\u6c42\u65f6\u53d1\u751f\u4e86\u4e0d\u53ef\u6062\u590d\u7684\u5185\u90e8\u9519\u8bef\u3002\u8fd9\u662f\u4e00\u4e2a\u300c\u4e07\u91d1\u6cb9\u300d\u5f02\u5e38\u7801\uff0c\u8868\u793a\u4ece\u7ad9\u81ea\u8eab\u51fa\u73b0\u4e86\u4e25\u91cd\u95ee\u9898\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **EEPROM\/Flash \u5199\u5165\u5931\u8d25\uff1a**\u4ece\u7ad9\u5c06\u914d\u7f6e\u5199\u5165\u975e\u6613\u5931\u6027\u5b58\u50a8\u5668\u65f6\u5931\u8d25\n    - **\u4f20\u611f\u5668\u6545\u969c\uff1a**\u4ece\u7ad9\u8fde\u63a5\u7684\u4f20\u611f\u5668\u635f\u574f\uff0c\u65e0\u6cd5\u63d0\u4f9b\u6709\u6548\u8bfb\u6570\n    - **\u5185\u90e8\u901a\u4fe1\u6545\u969c\uff1a**\u4ece\u7ad9\u5185\u90e8\u7684\u4e3b\u63a7\u82af\u7247\u4e0e\u5916\u8bbe\u4e4b\u95f4\u7684\u901a\u4fe1\u5f02\u5e38\n    - **\u6587\u4ef6\u7cfb\u7edf\u9519\u8bef\uff1a**\u6d89\u53ca\u6587\u4ef6\u64cd\u4f5c\u7684\u529f\u80fd\u7801\uff080x14\u30010x15\uff09\u9047\u5230\u6587\u4ef6\u7cfb\u7edf\u5f02\u5e38\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u68c0\u67e5\u4ece\u7ad9\u8bbe\u5907\u7684\u7535\u6e90\u662f\u5426\u7a33\u5b9a\n    - \u67e5\u770b\u4ece\u7ad9\u7684 LED \u6307\u793a\u706f\u72b6\u6001\uff08\u901a\u5e38\u6709\u6545\u969c\u706f\uff09\n    - \u5c1d\u8bd5\u5bf9\u4ece\u7ad9\u8fdb\u884c\u65ad\u7535\u91cd\u542f\n    - \u8054\u7cfb\u8bbe\u5907\u5382\u5546\u83b7\u53d6\u8bca\u65ad\u5de5\u5177\u6216\u56fa\u4ef6\u5347\u7ea7\n\n### \u5f02\u5e38\u7801 0x05 \u2014 \u786e\u8ba4\uff08Acknowledge\uff09\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u5df2\u7ecf\u63a5\u53d7\u8bf7\u6c42\uff0c\u4f46\u9700\u8981\u8f83\u957f\u65f6\u95f4\u6765\u5904\u7406\u3002\u8fd9\u4e0d\u662f\u4e00\u4e2a\u9519\u8bef\uff0c\u800c\u662f\u4e00\u4e2a\u300c\u8bf7\u7a0d\u5019\u300d\u7684\u4fe1\u53f7\u3002\u4ece\u7ad9\u6b63\u5728\u6267\u884c\u64cd\u4f5c\uff0c\u5904\u7406\u5b8c\u6210\u540e\u4f1a\u8fd4\u56de\u6b63\u5e38\u54cd\u5e94\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **EEPROM \u5199\u5165\u8017\u65f6\u8f83\u957f\uff1a**\u67d0\u4e9b\u8bbe\u5907\u7684\u975e\u6613\u5931\u6027\u5b58\u50a8\u5668\u5199\u5165\u53ef\u80fd\u9700\u8981\u6570\u767e\u6beb\u79d2\n    - **\u56fa\u4ef6\u5347\u7ea7\u64cd\u4f5c\uff1a**\u5199\u5165\u7a0b\u5e8f\u5b58\u50a8\u5668\u9700\u8981\u8f83\u957f\u65f6\u95f4\n    - **\u7535\u673a\u6267\u884c\u52a8\u4f5c\uff1a**\u4ece\u7ad9\u6b63\u5728\u6267\u884c\u7269\u7406\u52a8\u4f5c\uff08\u5982\u9600\u95e8\u5f00\u5173\uff09\n\n**\u7f16\u7a0b\u5efa\u8bae\uff1a**\u4e3b\u7ad9\u6536\u5230\u5f02\u5e38\u7801 0x05 \u540e\uff0c\u4e0d\u5e94\u7acb\u5373\u91cd\u8bd5\u6216\u62a5\u9519\uff0c\u800c\u5e94\u7b49\u5f85\u9002\u5f53\u65f6\u95f4\u540e\u91cd\u65b0\u8f6e\u8be2\u3002\u5efa\u8bae\u4f7f\u7528\u72b6\u6001\u673a\u5904\u7406\uff1a\n\n```\n\/\/ \u5f02\u6b65\u5904\u7406\u786e\u8ba4\u54cd\u5e94\u7684\u72b6\u6001\u673a\nenum { IDLE, WAITING, POLLING } state = IDLE;\n\nvoid modbus_handler(uint8_t func, uint8_t* data) {\n    if (func & 0x80) {\n        if (data[0] == 0x05) {\n            state = POLLING;\n            start_poll_timer(500); \/\/ 500ms \u540e\u91cd\u65b0\u67e5\u8be2\n        }\n    }\n}\n```\n\n### \u5f02\u5e38\u7801 0x06 \u2014 \u4ece\u7ad9\u8bbe\u5907\u5fd9\uff08Slave Device Busy\uff09\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u6b63\u5728\u5904\u7406\u4e00\u4e2a\u8017\u65f6\u8f83\u957f\u7684\u547d\u4ee4\uff0c\u6682\u65f6\u65e0\u6cd5\u54cd\u5e94\u65b0\u7684\u8bf7\u6c42\u3002\u4e0e 0x05 \u7684\u533a\u522b\u5728\u4e8e\uff1a0x05 \u662f\u300c\u6211\u5728\u5904\u7406\u4f60\u521a\u53d1\u7684\u8bf7\u6c42\u300d\uff0c0x06 \u662f\u300c\u6211\u73b0\u5728\u6ca1\u7a7a\u5904\u7406\u4efb\u4f55\u8bf7\u6c42\u300d\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u4ece\u7ad9\u5728\u6267\u884c\u8017\u65f6\u64cd\u4f5c\uff1a**\u5982\u56fa\u4ef6\u5347\u7ea7\u3001\u5927\u91cf\u6570\u636e\u62f7\u8d1d\n    - **\u4ece\u7ad9 CPU \u8d1f\u8f7d\u8fc7\u9ad8\uff1a**\u786c\u4ef6\u6027\u80fd\u6709\u9650\uff0c\u65e0\u6cd5\u53ca\u65f6\u5904\u7406 Modbus \u8bf7\u6c42\n    - **\u4ece\u7ad9\u6b63\u5728\u8fdb\u884c\u81ea\u8bca\u65ad\uff1a**\u90e8\u5206\u8bbe\u5907\u5728\u542f\u52a8\u65f6\u4f1a\u6267\u884c\u81ea\u68c0\uff0c\u671f\u95f4\u4e0d\u54cd\u5e94\u901a\u4fe1\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u9002\u5f53\u589e\u52a0\u4e3b\u7ad9\u7684\u8f6e\u8be2\u95f4\u9694\uff08\u5982\u4ece 100ms \u589e\u52a0\u5230 500ms\uff09\n    - \u51cf\u5c11\u540c\u65f6\u901a\u4fe1\u7684\u4ece\u7ad9\u6570\u91cf\n    - \u68c0\u67e5\u4ece\u7ad9\u7684\u56fa\u4ef6\u7248\u672c\uff0c\u786e\u8ba4\u662f\u5426\u6709\u5df2\u77e5\u7684\u6027\u80fd\u95ee\u9898\n\n### \u5f02\u5e38\u7801 0x07 \u2014 \u5426\u5b9a\u786e\u8ba4\uff08Negative Acknowledge\uff09\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u65e0\u6cd5\u6267\u884c\u8bf7\u6c42\u4e2d\u7684\u7f16\u7a0b\u529f\u80fd\u3002\u8fd9\u662f\u4e13\u95e8\u4e3a 0x0D\uff08\u7f16\u7a0b\u529f\u80fd\uff09\u8bbe\u8ba1\u7684\u5f02\u5e38\u7801\uff0c\u8868\u793a\u7f16\u7a0b\u8bf7\u6c42\u88ab\u62d2\u7edd\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u7f16\u7a0b\u8bf7\u6c42\u7c7b\u578b\u4e0d\u652f\u6301\uff1a**\u4ece\u7ad9\u7684\u7f16\u7a0b\u529f\u80fd\u6709\u9650\uff0c\u4e0d\u652f\u6301\u7279\u5b9a\u7684\u7f16\u7a0b\u64cd\u4f5c\n    - **\u7f16\u7a0b\u53c2\u6570\u65e0\u6548\uff1a**\u8bf7\u6c42\u4e2d\u5305\u542b\u4e86\u4e0d\u652f\u6301\u7684\u7f16\u7a0b\u53c2\u6570\n\n**\u6ce8\u610f\u4e8b\u9879\uff1a**\u5f02\u5e38\u7801 0x07 \u5728 Modbus \u534f\u8bae\u89c4\u8303 V1.1b3 \u4e2d\u5b9a\u4e49\uff0c\u4f46\u5b9e\u9645\u4e0a\u7edd\u5927\u591a\u6570 Modbus \u8bbe\u5907\u5e76\u4e0d\u5b9e\u73b0\u529f\u80fd\u7801 0x0D\uff08\u7f16\u7a0b\uff09\uff0c\u56e0\u6b64\u8fd9\u4e2a\u5f02\u5e38\u7801\u5728\u73b0\u5b9e\u4e2d\u6781\u5c11\u9047\u5230\u3002\n\n### \u5f02\u5e38\u7801 0x08 \u2014 \u5b58\u50a8\u5668\u5947\u5076\u6821\u9a8c\u9519\u8bef\uff08Memory Parity Error\uff09\n\n**\u542b\u4e49\uff1a**\u4ece\u7ad9\u5728\u8bfb\u53d6\u6587\u4ef6\u8bb0\u5f55\u65f6\uff0c\u68c0\u6d4b\u5230\u5b58\u50a8\u5668\u5947\u5076\u6821\u9a8c\u9519\u8bef\u3002\u4ec5\u4e0e\u6587\u4ef6\u64cd\u4f5c\u529f\u80fd\u7801\uff080x14\u30010x15\uff09\u76f8\u5173\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u6587\u4ef6\u8bb0\u5f55\u635f\u574f\uff1a**\u6587\u4ef6\u5b58\u50a8\u533a\u57df\u56e0\u7535\u6e90\u6545\u969c\u6216\u5176\u4ed6\u539f\u56e0\u6570\u636e\u635f\u574f\n    - **Flash \u5b58\u50a8\u5668\u8001\u5316\uff1a**\u9891\u7e41\u5199\u5165\u5bfc\u81f4 Flash \u5b58\u50a8\u5355\u5143\u7684\u53ef\u9760\u6027\u4e0b\u964d\n\n### \u5f02\u5e38\u7801 0x0A \u2014 \u7f51\u5173\u8def\u5f84\u4e0d\u53ef\u7528\uff08Gateway Path Unavailable\uff09\n\n**\u542b\u4e49\uff1a**\u7f51\u5173\u65e0\u6cd5\u5efa\u7acb\u5230\u76ee\u6807\u8bbe\u5907\u7684\u5185\u90e8\u901a\u4fe1\u8def\u5f84\u3002\u8fd9\u901a\u5e38\u53d1\u751f\u5728\u7f51\u5173\u8fde\u63a5\u4e86\u591a\u4e2a\u4e0b\u6e38\u8bbe\u5907\u65f6\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u4e0b\u6e38\u8bbe\u5907\u79bb\u7ebf\uff1a**\u7f51\u5173\u540e\u7684 Modbus RTU \u8bbe\u5907\u65ad\u7535\u6216\u65ad\u5f00\u8fde\u63a5\n    - **\u4e0b\u6e38\u8bbe\u5907\u5730\u5740\u9519\u8bef\uff1a**\u7f51\u5173\u88ab\u914d\u7f6e\u4e3a\u8f6c\u53d1\u5230\u4e0d\u5b58\u5728\u7684\u4ece\u7ad9\u5730\u5740\n    - **\u7f51\u5173\u5185\u90e8\u8def\u7531\u8868\u9519\u8bef\uff1a**\u7f51\u5173\u7684\u8def\u7531\u914d\u7f6e\u4e0d\u6b63\u786e\n\n**\u6392\u67e5\u6b65\u9aa4\uff1a**\n\n    - \u68c0\u67e5\u7f51\u5173\u4e0b\u6e38\u8bbe\u5907\u7684\u901a\u4fe1\u72b6\u6001\u6307\u793a\u706f\n    - \u4f7f\u7528 Modbus Poll \u76f4\u63a5\u8fde\u63a5\u4e0b\u6e38\u8bbe\u5907\uff0c\u6392\u9664\u8bbe\u5907\u672c\u8eab\u6545\u969c\n    - \u68c0\u67e5\u7f51\u5173\u7684\u8def\u7531\u8868\u914d\u7f6e\n    - \u786e\u8ba4\u4e0b\u6e38\u8bbe\u5907\u7684 Modbus \u5730\u5740\u548c\u6ce2\u7279\u7387\u8bbe\u7f6e\n\n### \u5f02\u5e38\u7801 0x0B \u2014 \u7f51\u5173\u76ee\u6807\u8bbe\u5907\u54cd\u5e94\u5931\u8d25\uff08Gateway Target Device Failed to Respond\uff09\n\n**\u542b\u4e49\uff1a**\u7f51\u5173\u80fd\u591f\u5efa\u7acb\u901a\u4fe1\u8def\u5f84\uff0c\u4f46\u76ee\u6807\u8bbe\u5907\u672a\u80fd\u63d0\u4f9b\u6709\u6548\u54cd\u5e94\u3002\u4e0e 0x0A \u7684\u533a\u522b\uff1a0x0A \u662f\u7f51\u5173\u5185\u90e8\u8def\u5f84\u4e0d\u901a\uff0c0x0B \u662f\u8def\u5f84\u901a\u4e86\u4f46\u76ee\u6807\u8bbe\u5907\u65e0\u54cd\u5e94\u3002\n\n**\u5178\u578b\u89e6\u53d1\u573a\u666f\uff1a**\n\n    - **\u76ee\u6807\u8bbe\u5907\u7e41\u5fd9\uff1a**\u8bbe\u5907\u6b63\u5728\u5904\u7406\u4e0a\u4e00\u6761\u6307\u4ee4\n    - **\u76ee\u6807\u8bbe\u5907\u54cd\u5e94\u8d85\u65f6\uff1a**Modbus RTU \u7684 3.5 \u5b57\u7b26\u8d85\u65f6\u673a\u5236\u89e6\u53d1\n    - **\u6570\u636e\u683c\u5f0f\u4e0d\u5339\u914d\uff1a**\u4e0b\u6e38\u8bbe\u5907\u7684\u901a\u4fe1\u53c2\u6570\uff08\u6ce2\u7279\u7387\u3001\u6821\u9a8c\u65b9\u5f0f\uff09\u4e0e\u7f51\u5173\u8bbe\u7f6e\u4e0d\u4e00\u81f4\n\n## \u4e09\u3001\u5f02\u5e38\u7801\u901f\u67e5\u8868\n\n    \n        \n            \u5f02\u5e38\u7801\n            \u540d\u79f0\uff08\u82f1\u6587\uff09\n            \u540d\u79f0\uff08\u4e2d\u6587\uff09\n            \u5e38\u89c1\u7a0b\u5ea6\n        \n    \n    \n        0x01Illegal Function\u975e\u6cd5\u529f\u80fd\u2605\u2605\u2605\u2605\u2605\n        0x02Illegal Data Address\u975e\u6cd5\u6570\u636e\u5730\u5740\u2605\u2605\u2605\u2605\u2605\n        0x03Illegal Data Value\u975e\u6cd5\u6570\u636e\u503c\u2605\u2605\u2605\u2605\u2606\n        0x04Slave Device Failure\u4ece\u7ad9\u8bbe\u5907\u6545\u969c\u2605\u2605\u2605\u2606\u2606\n        0x05Acknowledge\u786e\u8ba4\uff08\u7b49\u5f85\u4e2d\uff09\u2605\u2605\u2605\u2606\u2606\n        0x06Slave Device Busy\u4ece\u7ad9\u8bbe\u5907\u5fd9\u2605\u2605\u2605\u2606\u2606\n        0x07Negative Acknowledge\u5426\u5b9a\u786e\u8ba4\u2605\u2606\u2606\u2606\u2606\n        0x08Memory Parity Error\u5b58\u50a8\u5668\u6821\u9a8c\u9519\u8bef\u2605\u2606\u2606\u2606\u2606\n        0x0AGateway Path Unavailable\u7f51\u5173\u8def\u5f84\u4e0d\u53ef\u7528\u2605\u2605\u2606\u2606\u2606\n        0x0BGateway Target Failed\u7f51\u5173\u76ee\u6807\u54cd\u5e94\u5931\u8d25\u2605\u2605\u2606\u2606\u2606\n    \n\n## \u56db\u3001\u6df1\u5ea6\u6545\u969c\u6392\u67e5\u65b9\u6cd5\u8bba\n\n### 4.1 \u5206\u5c42\u6392\u67e5\u6cd5\n\n\u5de5\u4e1a\u901a\u4fe1\u6545\u969c\u6392\u67e5\u5e94\u9075\u5faa\u300c\u81ea\u5e95\u5411\u4e0a\u300d\u7684\u539f\u5219\uff0c\u4ece\u7269\u7406\u5c42\u9010\u6b65\u5411\u4e0a\u5c42\u6392\u67e5\uff1a\n\n    - **\u7269\u7406\u5c42\uff1a**\u68c0\u67e5\u7ebf\u7f06\u8fde\u63a5\u3001\u7ec8\u7aef\u7535\u963b\u3001\u8bbe\u5907\u4f9b\u7535\u3001\u63a5\u5730\u60c5\u51b5\n    - **\u6570\u636e\u94fe\u8def\u5c42\uff1a**\u4f7f\u7528\u793a\u6ce2\u5668\u6216\u903b\u8f91\u5206\u6790\u4eea\u68c0\u67e5 RS-485 \u4fe1\u53f7\u8d28\u91cf\n    - **\u7f51\u7edc\u5c42\uff1a**\u5728 Modbus TCP \u573a\u666f\u4e0b\uff0c\u4f7f\u7528 Wireshark \u6293\u5305\u5206\u6790\n    - **\u5e94\u7528\u5c42\uff1a**\u4f7f\u7528 Modbus Poll \u7b49\u5de5\u5177\u53d1\u9001\u6700\u5c0f\u5316\u8bf7\u6c42\u6765\u5b9a\u4f4d\u95ee\u9898\n\n### 4.2 \u5bf9\u6bd4\u6392\u9664\u6cd5\n\n\u5f53\u73b0\u573a\u6709\u591a\u4e2a\u540c\u578b\u53f7\u8bbe\u5907\u65f6\uff0c\u4f7f\u7528\u5bf9\u6bd4\u6392\u9664\u6cd5\u662f\u6700\u9ad8\u6548\u7684\u5b9a\u4f4d\u624b\u6bb5\uff1a\n\n    - \u5c06\u7591\u4f3c\u6545\u969c\u8bbe\u5907\u4e0e\u6b63\u5e38\u5de5\u4f5c\u7684\u8bbe\u5907\u4ea4\u6362\u4f4d\u7f6e\n    - \u4f7f\u7528\u540c\u4e00\u53f0\u4e3b\u7ad9\u5de5\u5177\u5206\u522b\u6d4b\u8bd5\u4e24\u53f0\u8bbe\u5907\n    - \u6bd4\u8f83\u4e24\u53f0\u8bbe\u5907\u7684\u54cd\u5e94\u62a5\u6587\u5dee\u5f02\n\n### 4.3 \u6700\u5c0f\u5316\u590d\u73b0\u6cd5\n\n\u5c06\u590d\u6742\u8bf7\u6c42\u7b80\u5316\u4e3a\u6700\u7b80\u5355\u7684\u5408\u6cd5\u8bf7\u6c42\uff0c\u9010\u6b65\u589e\u52a0\u590d\u6742\u5ea6\uff1a\n\n```\n\u6b65\u9aa4 1: \u53d1\u9001\u6700\u7b80\u8bf7\u6c42 01 03 00 00 00 01 [CRC] \u2014\u2014 \u8bfb\u53d6\u5730\u5740 0 \u7684 1 \u4e2a\u5bc4\u5b58\u5668\n\u6b65\u9aa4 2: \u5982\u679c\u6210\u529f\uff0c\u9010\u6b65\u589e\u52a0\u5bc4\u5b58\u5668\u6570\u91cf 00 02, 00 03 ...\n\u6b65\u9aa4 3: \u5982\u679c\u5931\u8d25\uff0c\u7f29\u5c0f\u5730\u5740\u8303\u56f4\u6392\u67e5\n```\n\n## \u4e94\u3001RTU \u4e0e TCP \u6a21\u5f0f\u4e0b\u7684\u5f02\u5e38\u5dee\u5f02\n\n\u867d\u7136\u5f02\u5e38\u7801\u7684\u5b9a\u4e49\u5728 RTU \u548c TCP \u6a21\u5f0f\u4e0b\u5b8c\u5168\u4e00\u81f4\uff0c\u4f46\u4e24\u79cd\u6a21\u5f0f\u4e0b\u7684\u5f02\u5e38\u5904\u7406\u6d41\u7a0b\u6709\u6240\u4e0d\u540c\uff1a\n\n    \n        \u5bf9\u6bd4\u7ef4\u5ea6Modbus RTUModbus TCP\n    \n    \n        \u8d85\u65f6\u5904\u74063.5 \u5b57\u7b26\u65f6\u95f4\u65e0\u54cd\u5e94\u5224\u5b9a\u8d85\u65f6TCP \u8fde\u63a5\u8d85\u65f6\u7531\u64cd\u4f5c\u7cfb\u7edf\u63a7\u5236\n        \u5f02\u5e38\u68c0\u6d4bCRC \u6821\u9a8c\u9519\u8bef\u76f4\u63a5\u4e22\u5f03\u62a5\u6587TCP \u5c42\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\n        MBAP \u62a5\u5934\u65e0\u9700\u8981\u68c0\u67e5\u4e8b\u52a1\u6807\u8bc6\u7b26\u5339\u914d\n        \u7f51\u5173\u573a\u666f\u8f83\u5c11\u6d89\u53ca\u5f02\u5e38\u7801 0x0A\/0x0B \u66f4\u5e38\u89c1\n    \n\n## \u516d\u3001\u7f16\u7a0b\u5b9e\u73b0\uff1a\u5f02\u5e38\u5904\u7406\u7684\u6700\u4f73\u5b9e\u8df5\n\n\u4ee5\u4e0b\u662f\u4f7f\u7528 C \u8bed\u8a00\u5b9e\u73b0 Modbus \u5f02\u5e38\u5904\u7406\u7684\u5b8c\u6574\u793a\u4f8b\uff0c\u9002\u7528\u4e8e\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5f00\u53d1\uff1a\n\n```\n\/**\n * Modbus \u5f02\u5e38\u7801\u5904\u7406\u51fd\u6570\n * @param func      \u8bf7\u6c42\u529f\u80fd\u7801\n * @param exception \u5f02\u5e38\u7801\n * @return \u4eba\u7c7b\u53ef\u8bfb\u7684\u9519\u8bef\u63cf\u8ff0\u5b57\u7b26\u4e32\n *\/\nconst char* modbus_exception_str(uint8_t func, uint8_t exception) {\n    static char buf[128];\n    const char* exc_name;\n    \n    switch (exception) {\n        case 0x01: exc_name = \"\u975e\u6cd5\u529f\u80fd\u7801\"; break;\n        case 0x02: exc_name = \"\u975e\u6cd5\u6570\u636e\u5730\u5740\"; break;\n        case 0x03: exc_name = \"\u975e\u6cd5\u6570\u636e\u503c\"; break;\n        case 0x04: exc_name = \"\u4ece\u7ad9\u8bbe\u5907\u6545\u969c\"; break;\n        case 0x05: exc_name = \"\u786e\u8ba4(\u7b49\u5f85\u4e2d)\"; break;\n        case 0x06: exc_name = \"\u4ece\u7ad9\u8bbe\u5907\u5fd9\"; break;\n        case 0x07: exc_name = \"\u5426\u5b9a\u786e\u8ba4\"; break;\n        case 0x08: exc_name = \"\u5b58\u50a8\u5668\u6821\u9a8c\u9519\u8bef\"; break;\n        case 0x0A: exc_name = \"\u7f51\u5173\u8def\u5f84\u4e0d\u53ef\u7528\"; break;\n        case 0x0B: exc_name = \"\u7f51\u5173\u76ee\u6807\u54cd\u5e94\u5931\u8d25\"; break;\n        default:   exc_name = \"\u672a\u77e5\u5f02\u5e38\u7801\"; break;\n    }\n    \n    snprintf(buf, sizeof(buf), \n             \"Modbus \u5f02\u5e38: \u529f\u80fd\u7801 0x%02X \u2192 \u5f02\u5e38\u7801 0x%02X (%s)\",\n             func, exception, exc_name);\n    return buf;\n}\n\n\/**\n * \u5904\u7406 Modbus \u54cd\u5e94\n * \u8fd4\u56de 0 \u8868\u793a\u6b63\u5e38\u54cd\u5e94\uff0c\u8d1f\u503c\u8868\u793a\u5f02\u5e38\n *\/\nint modbus_handle_response(uint8_t* rsp, int rsp_len,\n                           uint8_t expected_func) {\n    if (rsp_len < 2) return -1; \/\/ \u54cd\u5e94\u957f\u5ea6\u5f02\u5e38\n    \n    uint8_t func = rsp[1]; \/\/ RTU \u6a21\u5f0f\u4e0b\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u8282\u662f\u529f\u80fd\u7801\n    \n    if (func & 0x80) {\n        \/\/ \u5f02\u5e38\u54cd\u5e94\n        uint8_t exception = rsp[2];\n        log_error(modbus_exception_str(func & 0x7F, exception));\n        \n        \/\/ \u6839\u636e\u5f02\u5e38\u7801\u91c7\u53d6\u4e0d\u540c\u7684\u91cd\u8bd5\u7b56\u7565\n        switch (exception) {\n            case 0x01: \/\/ \u529f\u80fd\u7801\u4e0d\u652f\u6301 - \u4e0d\u91cd\u8bd5\n            case 0x02: \/\/ \u5730\u5740\u975e\u6cd5 - \u4e0d\u91cd\u8bd5\n                return -exception;\n            case 0x05: \/\/ \u786e\u8ba4 - \u7b49\u5f85\u540e\u91cd\u8bd5\n            case 0x06: \/\/ \u8bbe\u5907\u5fd9 - \u5ef6\u8fdf\u91cd\u8bd5\n                return -exception; \/\/ \u8c03\u7528\u8005\u5904\u7406\u91cd\u8bd5\u903b\u8f91\n            default:\n                return -exception;\n        }\n    }\n    \n    \/\/ \u6b63\u5e38\u54cd\u5e94\u5904\u7406...\n    return 0;\n}\n```\n\n## \u4e03\u3001\u5e38\u89c1\u95ee\u9898 FAQ\n\n### Q1: Modbus \u4ece\u7ad9\u8fd4\u56de\u4e86\u5f02\u5e38\u7801 0x02\uff0c\u4f46\u5730\u5740\u770b\u8d77\u6765\u662f\u6b63\u786e\u7684\uff0c\u4e3a\u4ec0\u4e48\uff1f\n\n\u6700\u5e38\u89c1\u7684\u539f\u56e0\u662f\u300c\u5730\u5740\u504f\u79fb 1\u300d\u7684\u95ee\u9898\u3002\u67d0\u4e9b\u8bbe\u5907\uff08\u7279\u522b\u662f PLC\uff09\u7684 Modbus \u5730\u5740\u4e0e\u534f\u8bae\u5730\u5740\u5b58\u5728 1 \u7684\u504f\u79fb\u3002\u6bd4\u5982 PLC \u7aef\u914d\u7f6e\u5730\u5740\u4e3a 40001\uff0c\u4f46 Modbus \u534f\u8bae\u4e2d\u5bf9\u5e94\u7684\u5185\u90e8\u5730\u5740\u662f 0\uff08\u800c\u4e0d\u662f 1\uff09\u3002\u8bf7\u67e5\u9605\u8bbe\u5907\u624b\u518c\u786e\u8ba4\u5730\u5740\u6620\u5c04\u5173\u7cfb\u3002\n\n### Q2: \u4e3a\u4ec0\u4e48\u4ece\u7ad9\u6709\u65f6\u8fd4\u56de\u6b63\u5e38\u6570\u636e\uff0c\u6709\u65f6\u8fd4\u56de\u5f02\u5e38\u7801 0x06\uff1f\n\n\u8fd9\u901a\u5e38\u610f\u5473\u7740\u4ece\u7ad9\u7684 CPU \u5904\u7406\u80fd\u529b\u4e0d\u8db3\u3002\u5f53\u8f6e\u8be2\u9891\u7387\u8fc7\u9ad8\u65f6\uff0c\u4ece\u7ad9\u6765\u4e0d\u53ca\u5904\u7406\u6240\u6709\u8bf7\u6c42\uff0c\u5c31\u4f1a\u8fd4\u56de 0x06\u3002\u89e3\u51b3\u65b9\u6cd5\uff1a\u964d\u4f4e\u8f6e\u8be2\u9891\u7387\uff0c\u6216\u51cf\u5c11\u5355\u6b21\u8bf7\u6c42\u7684\u5bc4\u5b58\u5668\u6570\u91cf\u3002\n\n### Q3: \u5f02\u5e38\u7801 0x05 \u548c 0x06 \u6709\u4ec0\u4e48\u533a\u522b\uff1f\n\n0x05\uff08\u786e\u8ba4\uff09\uff1a\u4ece\u7ad9\u5df2\u7ecf\u5728\u5904\u7406\u4f60\u53d1\u9001\u7684\u7279\u5b9a\u8bf7\u6c42\uff0c\u9700\u8981\u7b49\u5f85\u5b8c\u6210\u30020x06\uff08\u8bbe\u5907\u5fd9\uff09\uff1a\u4ece\u7ad9\u5f53\u524d\u65e0\u6cd5\u5904\u7406\u4efb\u4f55\u65b0\u8bf7\u6c42\uff0c\u539f\u56e0\u53ef\u80fd\u662f\u4efb\u610f\u64cd\u4f5c\u3002\u7b80\u5355\u8bb0\u5fc6\uff1a0x05 \u662f\u300c\u4f60\u7684\u4e8b\u6211\u5728\u529e\u300d\uff0c0x06 \u662f\u300c\u6211\u73b0\u5728\u5f88\u5fd9\u8c01\u90fd\u522b\u6765\u300d\u3002\n\n### Q4: \u4ece\u7ad9\u5b8c\u5168\u4e0d\u54cd\u5e94\uff08\u8d85\u65f6\uff09\uff0c\u800c\u4e0d\u662f\u8fd4\u56de\u5f02\u5e38\u7801\uff0c\u8be5\u600e\u4e48\u6392\u67e5\uff1f\n\n\u5b8c\u5168\u65e0\u54cd\u5e94\u901a\u5e38\u610f\u5473\u7740\u95ee\u9898\u5728\u7269\u7406\u5c42\u6216\u6570\u636e\u94fe\u8def\u5c42\uff1a\n\n    - \u68c0\u67e5\u4ece\u7ad9\u5730\u5740\u662f\u5426\u6b63\u786e\uff08\u5730\u5740\u4e0d\u5339\u914d\u662f\u4ece\u7ad9\u9759\u9ed8\u7684\u6700\u5e38\u89c1\u539f\u56e0\uff09\n    - \u68c0\u67e5 RS-485 \u7684 A\/B \u7ebf\u662f\u5426\u63a5\u53cd\n    - \u68c0\u67e5\u6ce2\u7279\u7387\u548c\u6821\u9a8c\u65b9\u5f0f\u662f\u5426\u5339\u914d\n    - \u68c0\u67e5\u7ec8\u7aef\u7535\u963b\u548c\u504f\u7f6e\u7535\u963b\n    - \u4f7f\u7528\u793a\u6ce2\u5668\u786e\u8ba4\u603b\u7ebf\u4e0a\u662f\u5426\u6709\u4fe1\u53f7\n\n## \u516b\u3001\u603b\u7ed3\n\nModbus \u7684\u5f02\u5e38\u54cd\u5e94\u673a\u5236\u662f\u534f\u8bae\u8bbe\u8ba1\u4e2d\u7684\u4e00\u5927\u4eae\u70b9\u2014\u2014\u5b83\u4e0d\u662f\u7b80\u5355\u5730\u8ba9\u901a\u4fe1\u5931\u8d25\uff0c\u800c\u662f\u901a\u8fc7\u5f02\u5e38\u7801\u7cbe\u786e\u5730\u544a\u8bc9\u4e3b\u7ad9\u300c\u54ea\u91cc\u51fa\u4e86\u95ee\u9898\u300d\u3002\u638c\u63e1\u8fd9\u4e9b\u5f02\u5e38\u7801\u7684\u542b\u4e49\u548c\u6392\u67e5\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u6545\u969c\u5b9a\u4f4d\u65f6\u95f4\u4ece\u6570\u5c0f\u65f6\u7f29\u77ed\u5230\u6570\u5206\u949f\u3002\n\n\u5efa\u8bae\u5c06\u672c\u6587\u7684\u5f02\u5e38\u7801\u901f\u67e5\u8868\u6253\u5370\u51fa\u6765\u8d34\u5728\u5de5\u4f4d\u65c1\uff0c\u6216\u8005\u5728\u8c03\u8bd5\u5de5\u5177\u4e2d\u96c6\u6210\u5f02\u5e38\u7801\u81ea\u52a8\u89e3\u6790\u529f\u80fd\u3002\u5728\u5de5\u4e1a\u73b0\u573a\uff0c\u6bcf\u4e00\u5206\u949f\u7684\u505c\u673a\u90fd\u610f\u5473\u7740\u771f\u91d1\u767d\u94f6\u7684\u635f\u5931\u2014\u2014\u800c\u5feb\u901f\u5b9a\u4f4d Modbus \u5f02\u5e38\u7801\uff0c\u5f80\u5f80\u662f\u89e3\u51b3\u95ee\u9898\u7684\u7b2c\u4e00\u6b65\u3002\n\n**\u76f8\u5173\u9605\u8bfb\uff1a**Modbus \u529f\u80fd\u7801\u5b8c\u5168\u89e3\u6790 | 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"