"# Modbus ASCII\u6570\u636e\u62a5\u6587\u7ed3\u6784\u8be6\u89e3\n\n> 2024-04-28 | 2026-06-30\n> https:\/\/www.modbus.cn\/en\/27886.html\n\n**Modbus \u534f\u8bae\u6807\u51c6**\n\n---\n\nModbus ASCII\u662fModbus\u7684\u4e00\u79cd\u6d88\u606f\u5e27\uff0c\u76f8\u6bd4RTU\uff0cASCII\u7684\u4f20\u8f93\u662f\u6309\u7167\u5b57\u7b26\u4f20\u7684\uff0c\u4f20\u8f93\u7684\u6570\u636e\u91cf\u4f1a\u6bd4RTU\u66f4\u591a\uff0c\u6240\u4ee5\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019\u4e00\u822c\u4f7f\u7528\u7684RTU\uff0c\u6570\u636e\u91cf\u5c0f\u7684\u65f6\u5019\u624d\u4f1a\u7528ASCII\uff0c\u7136\u540eASCII\u534f\u8bae\u5e27\u91cc\u9762\u6dfb\u52a0\u4e86\u8d77\u59cb\u548c\u7ed3\u675f\uff0c\u66f4\u6362\u4e86\u6821\u9a8c\u7b97\u6cd5\uff0c\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecdASCII\u534f\u8bae\n\n## \u5e27\u683c\u5f0f\n\nModbus ASCII \u6a21\u5f0f\u4e0b\u7684\u901a\u8baf\u5e27\u683c\u5f0f\u5982\u4e0b\uff1a\n\n\u540d\u79f0\u957f\u5ea6 (\u5b57\u8282)\u63cf\u8ff0Start1\u4ee5\u5192\u53f7 : \u5f00\u5934\uff0cASCII \u5341\u516d\u8fdb\u5236\u503c\u4e3a 3AAddress2\u5341\u516d\u8fdb\u5236\u8282\u70b9\u5730\u5740\uff0c\u5b57\u7b26\u8868\u793aFunction2\u5341\u516d\u8fdb\u5236\u529f\u80fd\u7801\uff0c\u5b57\u7b26\u8868\u793aDatan x 2n \u662f\u6570\u636e\u5b57\u8282\u6570\uff0c\u5b83\u53d6\u51b3\u4e8e\u529f\u80fd\u7801LRC2LRC\u5197\u4f59\u68c0\u9a8c\u7801End2CR \/ LF\n\n\u6ce8\uff1a\u5730\u5740\u3001\u529f\u80fd\u3001\u6570\u636e\u548c LRC \u90fd\u662f\u8868\u793a 8 \u4f4d\u503c (0-255) \u7684\u5927\u5199\u5341\u516d\u8fdb\u5236\u53ef\u8bfb\u5b57\u7b26\u5bf9\uff1b\u5373\uff1a\u5728 Modbus ASCII \u4e2d\uff0c\u6bcf\u4e2a\u6570\u636e\u5b57\u8282\u88ab\u5206\u5272\u6210\u8868\u793a\u5341\u516d\u8fdb\u5236\u503c\u4e2d\u7684\u4e24\u4e2a ASCII \u5b57\u7b26\u7684\u4e24\u4e2a\u5b57\u8282\u3002\n\n\u7ec4\u4ef6\u63cf\u8ff0\u5b57\u7b26\u6570ASCII\u8868\u793aStart\u6d88\u606f\u5f00\u59cb1 CHAR**:**Address\u8282\u70b9\u5730\u5740\uff08\u5341\u516d\u8fdb\u5236\u8868\u793a\uff092 CHARSFunction\u529f\u80fd\u7801\uff08\u5341\u516d\u8fdb\u5236\u8868\u793a\uff092 CHARSData\u6570\u636e\uff08\u6839\u636e\u529f\u80fd\u7801\u53d8\u5316\uff0c\u5341\u516d\u8fdb\u5236\u8868\u793a\uff09n CHARSLRC CHECK\u7eb5\u5411\u5197\u4f59\u68c0\u9a8c\u7801\uff08LRC\uff092 CHARSEND\u6d88\u606f\u7ed3\u675f\uff0c\u56de\u8f66\u6362\u884c2 CHARSCRLF\n\n\u5728 ASCII \u6a21\u5f0f\u4e0b\uff0cModbus \u6d88\u606f\u7684\u6bcf\u4e2a\u90e8\u5206\u90fd\u4ee5\u7279\u5b9a\u7684\u5b57\u7b26\u6570\u548c\u683c\u5f0f\u51fa\u73b0\uff0c\u5982\u4e0b\u6240\u793a\uff1a\n\n```\n:AA BB CC...DD EE<CRLF>\n```\n\n- `:` - \u6d88\u606f\u7684\u5f00\u59cb\u7b26\u53f7\u3002\n\n- `AA` - \u8282\u70b9\u5730\u5740\uff0c\u5341\u516d\u8fdb\u5236\u8868\u793a\u3002\n\n- `BB` - \u529f\u80fd\u7801\uff0c\u5341\u516d\u8fdb\u5236\u8868\u793a\u3002\n\n- `CC...DD` - \u6570\u636e\u5b57\u6bb5\uff0c\u6839\u636e\u529f\u80fd\u7801\u548c\u9700\u8981\u4f20\u8f93\u7684\u6570\u636e\u957f\u5ea6\u53d8\u5316\u3002\n\n- `EE` - LRC \u6821\u9a8c\u7801\uff0c\u7528\u4e8e\u9519\u8bef\u68c0\u6d4b\u3002\n\n- `<CRLF>` - \u6d88\u606f\u7684\u7ed3\u675f\u7b26\u53f7\uff0c\u4ee3\u8868\u56de\u8f66\u548c\u6362\u884c\uff08Carriage Return Line Feed\uff09\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428234607209.png)\n\n## ASCII\u5e27\u7684\u4f20\u8f93\u72b6\u6001\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000650409.png?x-oss-process=image\/resize,m_lfit,w_950,h_532)\n\n\u4e0a\u9762\u72b6\u6001\u56fe\u53ef\u4ee5\u5f97\u5230\u7684\u4fe1\u606f:\n\n1\uff09\u201c\u7a7a\u95f2\u201d \u6001\u662f\u6ca1\u6709\u53d1\u9001\u548c\u63a5\u6536\u62a5\u6587\u8981\u5904\u7406\u7684\u6b63\u5e38\u72b6\u6001\u3002\n\n2\uff09\u6bcf\u6b21\u63a5\u6536\u5230 \":\" \u5b57\u7b26\u8868\u793a\u65b0\u7684\u62a5\u6587\u7684\u5f00\u59cb\u3002\u5982\u679c\u5728\u4e00\u4e2a\u62a5\u6587\u7684\u63a5\u6536\u8fc7\u7a0b\u4e2d\u6536\u5230\u8be5\u5b57\u7b26\uff0c\u5219\u5f53\u524d\u5730\u62a5\u6587\u88ab\u8ba4\u4e3a\u4e0d\u5b8c\u6574\u5e76\u88ab\u4e22\u5f03\u3002\u800c\u4e00\u4e2a\u65b0\u7684\u63a5\u6536\u7f13\u51b2\u533a\u88ab\u91cd\u65b0\u5206\u914d\u3002\n\n3\uff09\u68c0\u6d4b\u5230\u5e27\u7ed3\u675f\u540e\uff0c\u5b8c\u6210 LRC \u8ba1\u7b97\u548c\u68c0\u9a8c\u3002\u7136\u540e\uff0c\u5206\u6790\u5730\u5740\u57df\u4ee5\u786e\u5b9a\u5e27\u662f\u5426\u53d1\u5f80\u6b64\u8bbe\u5907\uff0c\u5982\u679c\u4e0d\u662f\uff0c\u5219\u4e22\u5f03\u6b64\u5e27\u3002 \u4e3a\u4e86\u51cf\u5c11\u63a5\u6536\u5904\u7406\u65f6\u95f4\uff0c\u5730\u5740\u57df\u53ef\u4ee5\u5728\u4e00\u63a5\u5230\u5c31\u5206\u6790\uff0c\u800c\u4e0d\u9700\u8981\u7b49\u5230\u6574\u4e2a\u5e27\u7ed3\u675f\u3002\n\n## ASCII\u5e27\u7684\u62a5\u6587\u4f20\u8f93\n\n\u7531\u4e8eASCII\u62a5\u6587\u5e27\u4e0eRTU\u62a5\u6587\u5e27\u6709\u7740\u5f88\u5927\u7684\u4e0d\u540c\uff0cASCII\u62a5\u6587\u5e27\u662f\u6709\u8d77\u59cb\u548c\u7ed3\u675f\u6807\u8bc6\u7b26\u7684\uff0c\u800cRTU\u5e27\u6ca1\u6709\u8fd9\u6837\u7684\u6807\u8bc6\u3002\u6240\u4ee5ASCII\u62a5\u6587\u5e27\u7684\u63a5\u6536\u5c31\u7b80\u5355\u65b9\u4fbf\u591a\u4e86\uff0c\u4e5f\u4e0d\u9700\u8981\u4ec0\u4e48t3.5\u7684\u5e27\u95f4\u9694\u65f6\u95f4\u3002\n\n\u4f46\u662f\u5462\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u63a5\u6536\u7684\u62a5\u6587\u5e27\u8fde\u7eed\uff0c\u8fd8\u662f\u53ef\u4ee5\u7ea6\u5b9a\u5b57\u7b26\u95f4\u7684\u4f20\u8f93\u65f6\u95f4\u7684\u3002\u4e00\u822c\u8ba4\u4e3a\uff0c\u62a5\u6587\u4e2d\u7684\u5b57\u7b26\u65f6\u95f4\u95f4\u9694\u53ef\u4ee5\u8fbe\u5230\u4e00\u79d2\uff0c\u5982\u679c\u8d85\u8fc7\u4e86\u8fd9\u4e2a\u65f6\u95f4\u95f4\u9694\uff0c\u5c31\u8ba4\u4e3a\u53d1\u751f\u4e86\u9519\u8bef\uff0c\u8981\u5e9f\u5f03\u6389\u8fd9\u4e00\u5e27\u62a5\u6587\u6570\u636e\uff0c\u91cd\u65b0\u5f00\u59cb\u63a5\u6536\u3002\n\n## \u529f\u80fd\u7801\n\nASCII \u6a21\u5f0f\u4e0b\u6700\u5e38\u7528\u7684\u529f\u80fd\u4ee3\u7801\u4e0e RTU \u6a21\u5f0f\u4e0b\u7684\u529f\u80fd\u4ee3\u7801\u5b9a\u4e49\u76f8\u540c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u672c\u7684\u529f\u80fd\u7801\u53ca\u5176\u63cf\u8ff0\uff1a\n\n\u8bbf\u95ee\u5730\u5740\u6620\u5c04\u5730\u5740\u63cf\u8ff0\u529f\u80fdR\/W1 ~ 10000address-1Coils01\/05\/15R\/W10001 ~ 20000address-10001Discrete Inputs02R30001 ~ 40000address-30001Input Registers04R40001 ~ 50000address-40001Holding Registers03\/06\/16R\/W\n\n### ASCII\u4f20\u8f93\u793a\u4f8b\n\n\u4f8b\u5982\uff0c\u8981\u8bfb\u53d6\u5730\u5740 `0x20C1` \u7684\u4e24\u4e2a\u5bc4\u5b58\u5668\uff0c\u9700\u8981\u53d1\u9001\u4ee5\u4e0b ASCII \u6d88\u606f\uff1a\n\n```\n:010420C1000218<CRLF>\n```\n\n\u8bf7\u6c42\uff1a\n\n- `:` - \u6d88\u606f\u5f00\u59cb - 0x3A\n\n- `01` - \u4ece\u7ad9\u5730\u5740 - 0x01\n\n- `04` - \u529f\u80fd\u7801 (\u8bfb\u53d6\u8f93\u5165\u5bc4\u5b58\u5668) - 0x04\n\n- `20C1` - \u8981\u8bfb\u53d6\u7684\u5bc4\u5b58\u5668\u5730\u5740 - 0x20C1\n\n- `0002` - \u8981\u8bfb\u53d6\u7684\u5bc4\u5b58\u5668\u957f\u5ea6 (\u5fc5\u987b\u662f 2) - 0x0002\n\n- `18` - LRC \u6821\u9a8c\u7801\n\n- `<CRLF>` - \u6d88\u606f\u7ed3\u675f\uff0c\u56de\u8f66\u6362\u884c - 0x0D0A\n\n\u54cd\u5e94\uff1a\n\n```\n:01040400001234B1<CRLF>\n```\n\n\u54cd\u5e94\uff1a\n\n- `:` - \u6d88\u606f\u5f00\u59cb - 0x3A\n\n- `01` - \u4ece\u7ad9\u5730\u5740 - 0x01\n\n- `04` - \u529f\u80fd\u7801 (\u8bfb\u53d6\u8f93\u5165\u5bc4\u5b58\u5668) - 0x04\n\n- `04` - \u8bfb\u53d6\u6570\u636e\u957f\u5ea6 (4 \u5b57\u8282) - 0x04\n\n- `00001234` - \u4ece VAR1 \u8bfb\u53d6\u7684\u503c - 0x00001234\n\n- `B1` - LRC \u6821\u9a8c\u7801\n\n- `<CRLF>` - \u6d88\u606f\u7ed3\u675f\uff0c\u56de\u8f66\u6362\u884c - 0x0D0A\n\n## \u5e38\u7528\u529f\u80fd\u7801\u64cd\u4f5c\n\n\u4ee5\u4e0b\u662f Modbus \u7684\u5e38\u7528\u529f\u80fd\u7801\u53ca\u5176\u8bf7\u6c42\u548c\u54cd\u5e94\u793a\u4f8b\uff1a\n\n### \u529f\u80fd 01\uff0801H\uff09\u8bfb\u7ebf\u5708\n\n- \u8bf7\u6c42\uff1a\u8bfb\u53d6\u4ece\u673a\u4e2d\u7ebf\u5708\u7684 ON\/OFF \u72b6\u6001\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235721252.png)\n\n- \u54cd\u5e94\uff1a\u7ebf\u5708\u72b6\u6001\u54cd\u5e94\u6d88\u606f\u88ab\u6253\u5305\u4e3a\u6570\u636e\u5b57\u6bb5\u7684\u6bcf\u6bd4\u7279\u8868\u793a\u4e00\u4e2a\u7ebf\u5708\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235733959.png)\n\n### \u529f\u80fd 02\uff0802H\uff09\u8bfb\u79bb\u6563\u8f93\u5165\n\n- \u8bf7\u6c42\uff1a\u8bfb\u53d6\u4ece\u673a\u4e2d\u79bb\u6563\u8f93\u5165\u7684 ON\/OFF \u72b6\u6001\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235746527.png)\n\n- \u54cd\u5e94\uff1a\u79bb\u6563\u8f93\u5165\u72b6\u6001\u54cd\u5e94\u6d88\u606f\u7684\u6784\u9020\u4e0e\u7ebf\u5708\u72b6\u6001\u76f8\u540c\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235756370.png)\n\n### \u529f\u80fd 03\uff0803H\uff09\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\n\n- \u8bf7\u6c42\uff1a\u8bfb\u53d6\u4ece\u673a\u4e2d\u4fdd\u6301\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u5185\u5bb9\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235811530.png)\n\n- \u54cd\u5e94\uff1a\u4fdd\u6301\u5bc4\u5b58\u5668\u6570\u636e\u5728\u6bcf\u4e2a\u5bc4\u5b58\u5668\u4e2d\u6253\u5305\u4e3a\u4e24\u4e2a\u5b57\u8282\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235821601.png)\n\n### \u529f\u80fd 04\uff0804H\uff09\u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\n\n- \u8bf7\u6c42\uff1a\u8bfb\u53d6\u4ece\u673a\u4e2d\u8f93\u5165\u5bc4\u5b58\u5668\u7684\u4e8c\u8fdb\u5236\u5185\u5bb9\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235833750.png)\n\n- \u54cd\u5e94\uff1a\u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\u6570\u636e\u7684\u54cd\u5e94\u6d88\u606f\u7684\u6784\u9020\u4e0e\u8bfb\u53d6\u4fdd\u6301\u5bc4\u5b58\u5668\u76f8\u540c\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240428235845939.png)\n\n### \u529f\u80fd 05\uff0805H\uff09\u5199\u5355\u7ebf\u5708\n\n- \u8bf7\u6c42\uff1a\u5c06\u5355\u4e2a\u7ebf\u5708\u5199\u5165 ON \u6216 OFF\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000029367.png)\n\n- \u54cd\u5e94\uff1a\u6b63\u5e38\u7684\u54cd\u5e94\u662f\u8bf7\u6c42\u7684\u56de\u663e\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000041894.png)\n\n### \u529f\u80fd 06\uff0806H\uff09\u5199\u5355\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\n\n- \u8bf7\u6c42\u5c06\u4e00\u4e2a\u503c\u5199\u5165\u5355\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u4e2d\u3002\u5f53\u5e7f\u64ad\u65f6\uff0c\u8be5\u51fd\u6570\u5728\u6240\u6709\u9644\u52a0\u7684\u4ece\u673a\u4e0a\u8bbe\u7f6e\u76f8\u540c\u7684\u5bc4\u5b58\u5668\u5f15\u7528\u3002\u8bf7\u6c42\u6d88\u606f\u6307\u5b9a\u8981\u5199\u5165\u7684\u5bc4\u5b58\u5668\u5f15\u7528\uff08\u6307\u5b9a\u5730\u5740\u548c\u6570\u503c\uff09\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000422789.png)\n\n- \u54cd\u5e94\n\n\u6b63\u5e38\u7684\u54cd\u5e94\u662f\u8bf7\u6c42\u7684\u56de\u663e\uff0c\u5728\u5199\u5165\u4fdd\u6301\u5bc4\u5b58\u5668\u5185\u5bb9\u4e4b\u540e\u8fd4\u56de\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000455848.png)\n\n### \u529f\u80fd 15\uff080FH\uff09\u5199\u591a\u4e2a\u7ebf\u5708\n\n- \u8bf7\u6c42\uff1a\u5c06\u4e00\u4e2a\u7ebf\u5708\u5e8f\u5217\u4e2d\u7684\u6bcf\u4e2a\u7ebf\u5708\u5199\u5165 ON \u6216 OFF\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000125390.png)\n\n- \u54cd\u5e94\uff1a\u6b63\u5e38\u54cd\u5e94\u8fd4\u56de\u4ece\u5730\u5740\u3001\u529f\u80fd\u4ee3\u7801\u3001\u8d77\u59cb\u5730\u5740\u548c\u5199\u5165\u7684\u7ebf\u5708\u6570\u91cf\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000138140.png)\n\n### \u529f\u80fd 16\uff0810H\uff09\u5199\u591a\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\n\n- \u8bf7\u6c42\uff1a\u5c06\u503c\u5199\u5165\u5230\u4e00\u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u5e8f\u5217\u4e2d\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000203560.png)\n\n- \u54cd\u5e94\uff1a\u6b63\u5e38\u54cd\u5e94\u8fd4\u56de\u4ece\u5730\u5740\u3001\u529f\u80fd\u4ee3\u7801\u3001\u8d77\u59cb\u5730\u5740\u548c\u5199\u5165\u7684\u5bc4\u5b58\u5668\u6570\u91cf\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/04\/20240429000214899.png)\n\n### LRC\u6821\u9a8c\n\nLRC \u6821\u9a8c\u7801\u7684\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a\n\n```\nunsigned char ucMBLRC( unsigned char * pucFrame, unsigned short usLen )\n{\n    unsigned char ucLRC = 0;  \/* LRC char initialized *\/\n\n    while( usLen-- )\n    {\n        ucLRC += *pucFrame++;   \/* Add buffer byte without carry *\/\n    }\n\n    \/* Return twos complement *\/\n    ucLRC = ( UCHAR ) ( -( ( CHAR ) ucLRC ) );\n    return ucLRC;\n}\n```\n\n---\n*modbus.cn*\n"