{"id":112718,"date":"2026-10-04T16:33:12","date_gmt":"2026-10-04T08:33:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112718.html"},"modified":"2026-10-04T16:33:12","modified_gmt":"2026-10-04T08:33:12","slug":"libmodbus-%e7%9a%84-modbus_mapping_new-%e5%87%bd%e6%95%b0%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%b8%ba-modbus-%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%80%e6%ac%a1%e6%80%a7%e5%88%86%e9%85%8d%e5%9b%9b%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112718.html","title":{"rendered":"libmodbus \u7684 modbus_mapping_new() \u51fd\u6570\u8be6\u89e3\uff1a\u4e3a Modbus \u670d\u52a1\u5668\u4e00\u6b21\u6027\u5206\u914d\u56db\u7c7b\u6570\u636e\u533a"},"content":{"rendered":"<ul class=\"gcb-tag-list\">\n<li><span class=\"gcb-tag\">\u901a\u4fe1<\/span><\/li>\n<li><span class=\"gcb-tag\">\u5d4c\u5165\u5f0f<\/span><\/li>\n<li><span class=\"gcb-tag\">\u7269\u8054\u7f51<\/span><\/li>\n<\/ul>\n<h3 class=\"gcb-project-title\">\u3010\u514d\u8d39\u4e0b\u8f7d\u94fe\u63a5\u3011libmodbus<\/h3>\n<p class=\"gcb-project-desc\">A Modbus library for Linux, Mac OS, FreeBSD and Windows<\/p>\n<p>    <span class=\"gcb-project-addr-label\">\u9879\u76ee\u5730\u5740&#xff1a;<\/span><br \/>\n    <span class=\"gcb-project-addr-link\">https:\/\/gitcode.com\/gh_mirrors\/li\/libmodbus<\/span> <\/p>\n<p>  <span class=\"gcb-project-btn\"> <span class=\"gcb-project-btn-main\">\u70b9\u51fb\u67e5\u770b<\/span> <span class=\"gcb-project-btn-sub\">\u514d\u8d39\u4e0b\u8f7d<\/span> <\/span> <\/p>\n<p>\u5bfc\u8bfb&#xff1a;\u672c\u6587\u4ee5 libmodbus \u5b98\u65b9\u6587\u6863 docs\/modbus_mapping_new.md \u4e3a\u4e3b\u7ebf&#xff0c;\u6df1\u5165\u8bb2\u89e3 modbus_mapping_new() \u8fd9\u4e2a\u4e13\u4e3a Modbus \u670d\u52a1\u5668\/\u4ece\u7ad9\u8bbe\u8ba1\u7684\u6620\u5c04\u5206\u914d\u51fd\u6570\u3002\u4f60\u5c06\u638c\u63e1\u5b83\u7684\u51fd\u6570\u539f\u578b\u3001\u56db\u7c7b\u6570\u636e\u533a\u7684\u5185\u5b58\u5e03\u5c40\u4e0e\u96f6\u503c\u8bed\u4e49\u3001\u8fd4\u56de\u503c\u4e0e\u9519\u8bef\u5904\u7406\u65b9\u5f0f&#xff0c;\u5e76\u901a\u8fc7\u4ed3\u5e93\u5185\u7684\u6d4b\u8bd5\u670d\u52a1\u5668\u6e90\u7801&#xff08;\u5982 tests\/unit-test-server.c&#xff09;\u7406\u89e3\u5b83\u5982\u4f55\u914d\u5408 modbus_reply() \u5b8c\u6210\u8bf7\u6c42\u5e94\u7b54&#xff0c;\u6700\u7ec8\u80fd\u591f\u72ec\u7acb\u5199\u51fa\u53ef\u8fd0\u884c\u3001\u53ef\u91ca\u653e\u7684 Modbus \u670d\u52a1\u5668\u6570\u636e\u6620\u5c04\u4ee3\u7801\u3002<\/p>\n<p>modbus_mapping_new() \u662f libmodbus \u4e2d\u7528\u4e8e\u5728 Modbus \u670d\u52a1\u5668\/\u4ece\u7ad9&#xff08;server\/slave&#xff09;\u4fa7\u5206\u914d\u6570\u636e\u5b58\u50a8\u533a\u7684\u6838\u5fc3 API\u3002\u5b83\u4e00\u6b21\u8c03\u7528\u5373\u53ef\u4e3a Modbus \u6807\u51c6\u7684\u56db\u7c7b\u5730\u5740\u7a7a\u95f4\u2014\u2014\u7ebf\u5708&#xff08;Coils&#xff0c;0x&#xff09;\u3001\u79bb\u6563\u8f93\u5165&#xff08;Discrete Inputs&#xff0c;1x&#xff09;\u3001\u4fdd\u6301\u5bc4\u5b58\u5668&#xff08;Holding Registers&#xff0c;4x&#xff09;\u548c\u8f93\u5165\u5bc4\u5b58\u5668&#xff08;Input Registers&#xff0c;3x&#xff09;\u2014\u2014\u5206\u522b\u521b\u5efa\u5b58\u50a8\u6570\u7ec4&#xff0c;\u5e76\u5c06\u6307\u9488\u7edf\u4e00\u5c01\u88c5\u8fdb modbus_mapping_t \u7ed3\u6784\u4f53\u4e2d&#xff0c;\u4f9b\u540e\u7eed\u7684\u8bf7\u6c42\u5904\u7406\u51fd\u6570\u4f7f\u7528\u3002<\/p>\n<h3>\u51fd\u6570\u539f\u578b\u4e0e\u57fa\u672c\u7528\u9014<\/h3>\n<p>modbus_mapping_t* modbus_mapping_new(int nb_bits, int nb_input_bits, int nb_registers, int nb_input_registers);<\/p>\n<p>\u8be5\u51fd\u6570\u4f1a\u5206\u914d\u56db\u4e2a\u6570\u7ec4&#xff0c;\u5206\u522b\u7528\u4e8e\u5b58\u50a8&#xff1a;<\/p>\n<table>\n<tr>\u53c2\u6570\u5bf9\u5e94\u6570\u636e\u533a\u6570\u7ec4\u5143\u7d20\u7c7b\u578b\u5730\u5740\u7a7a\u95f4<\/tr>\n<tbody>\n<tr>\n<td>nb_bits<\/td>\n<td>\u7ebf\u5708&#xff08;Coils&#xff09;<\/td>\n<td>uint8_t<\/td>\n<td>0x<\/td>\n<\/tr>\n<tr>\n<td>nb_input_bits<\/td>\n<td>\u79bb\u6563\u8f93\u5165&#xff08;Discrete Inputs&#xff09;<\/td>\n<td>uint8_t<\/td>\n<td>1x<\/td>\n<\/tr>\n<tr>\n<td>nb_registers<\/td>\n<td>\u4fdd\u6301\u5bc4\u5b58\u5668&#xff08;Holding Registers&#xff09;<\/td>\n<td>uint16_t<\/td>\n<td>4x<\/td>\n<\/tr>\n<tr>\n<td>nb_input_registers<\/td>\n<td>\u8f93\u5165\u5bc4\u5b58\u5668&#xff08;Input Registers&#xff09;<\/td>\n<td>uint16_t<\/td>\n<td>3x<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u56db\u4e2a\u6570\u7ec4\u7684\u6307\u9488\u88ab\u4fdd\u5b58\u5728 modbus_mapping_t \u7ed3\u6784\u4f53\u4e2d\u3002\u8be5\u7ed3\u6784\u4f53\u7684\u5b9a\u4e49\u4f4d\u4e8e src\/modbus.h&#xff0c;\u9664\u6570\u7ec4\u6307\u9488\u5916\u8fd8\u8bb0\u5f55\u4e86\u5404\u6570\u636e\u533a\u7684\u6570\u91cf&#xff08;nb_*&#xff09;\u548c\u8d77\u59cb\u5730\u5740&#xff08;start_*&#xff09;&#xff1a;<\/p>\n<p>typedef struct _modbus_mapping_t {<br \/>\n    int nb_bits;<br \/>\n    int start_bits;<br \/>\n    int nb_input_bits;<br \/>\n    int start_input_bits;<br \/>\n    int nb_input_registers;<br \/>\n    int start_input_registers;<br \/>\n    int nb_registers;<br \/>\n    int start_registers;<br \/>\n    uint8_t *tab_bits;<br \/>\n    uint8_t *tab_input_bits;<br \/>\n    uint16_t *tab_input_registers;<br \/>\n    uint16_t *tab_registers;<br \/>\n} modbus_mapping_t;<\/p>\n<p>\u6240\u6709\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u90fd\u4f1a\u88ab\u521d\u59cb\u5316\u4e3a\u96f6\u3002\u8fd9\u4e00\u70b9\u5728\u5b9e\u73b0\u4e2d\u7531 memset() \u4fdd\u8bc1&#xff1a;\u5206\u914d\u6210\u529f\u540e\u7acb\u5373\u5c06\u6574\u5757\u5185\u5b58\u6e05\u96f6&#xff08;\u89c1 src\/modbus.c&#xff09;&#xff0c;\u56e0\u6b64\u65b0\u5efa\u7684\u6620\u5c04\u5929\u7136\u5904\u4e8e\u201c\u5168\u90e8\u4e3a 0\/0x0000\u201d\u7684\u521d\u59cb\u72b6\u6001&#xff0c;\u65e0\u9700\u624b\u5de5\u6e05\u7a7a\u3002<\/p>\n<h3>\u5185\u90e8\u5b9e\u73b0&#xff1a;\u5b83\u662f modbus_mapping_new_start_address() \u7684\u4fbf\u6377\u5c01\u88c5<\/h3>\n<p>\u4ece\u6e90\u7801\u770b&#xff0c;modbus_mapping_new() \u5e76\u4e0d\u662f\u72ec\u7acb\u5b9e\u73b0\u7684\u5206\u914d\u903b\u8f91&#xff0c;\u800c\u662f\u5bf9 modbus_mapping_new_start_address \u7684\u7b80\u5355\u5c01\u88c5\u3002\u5176\u5b9e\u73b0\u4f4d\u4e8e src\/modbus.c&#xff1a;<\/p>\n<p>modbus_mapping_t *modbus_mapping_new(int nb_bits,<br \/>\n                                     int nb_input_bits,<br \/>\n                                     int nb_registers,<br \/>\n                                     int nb_input_registers)<br \/>\n{<br \/>\n    \/* Reject negative counts: they would otherwise be converted to very large<br \/>\n       unsigned dimensions and drive huge allocations. *\/<br \/>\n    if (nb_bits &lt; 0 || nb_input_bits &lt; 0 || nb_registers &lt; 0 ||<br \/>\n        nb_input_registers &lt; 0) {<br \/>\n        errno &#061; EINVAL;<br \/>\n        return NULL;<br \/>\n    }<\/p>\n<p>    return modbus_mapping_new_start_address(<br \/>\n        0, nb_bits, 0, nb_input_bits, 0, nb_registers, 0, nb_input_registers);<br \/>\n}<\/p>\n<p>\u8fd9\u91cc\u6709\u4e24\u4e2a\u503c\u5f97\u6ce8\u610f\u7684\u5b9e\u73b0\u7ec6\u8282&#xff1a;<\/p>\n<li>\u7b49\u4ef7\u6027&#xff1a;\u8be5\u51fd\u6570\u7b49\u4ef7\u4e8e\u4ee5\u5168\u90e8\u8d77\u59cb\u5730\u5740\u4e3a 0 \u8c03\u7528 modbus_mapping_new_start_address(0, nb_bits, 0, nb_input_bits, 0, nb_registers, 0, nb_input_registers)&#xff0c;\u56e0\u6b64\u5404\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5373\u5bf9\u5e94\u5730\u5740 0&#xff0c;\u6570\u7ec4\u4e0b\u6807\u4e0e Modbus \u5730\u5740\u4e00\u4e00\u5bf9\u5e94\u3002<\/li>\n<li>\u8d1f\u6570\u9632\u62a4&#xff1a;\u7531\u4e8e\u672c\u51fd\u6570\u91c7\u7528 int \u578b\u53c2\u6570&#xff08;\u800c modbus_mapping_new_start_address() \u4f7f\u7528 unsigned int&#xff09;&#xff0c;\u8d1f\u6570\u4f1a\u88ab\u8f6c\u6362\u6210\u6781\u5927\u7684\u65e0\u7b26\u53f7\u6570&#xff0c;\u4ece\u800c\u89e6\u53d1\u8d85\u5927\u5185\u5b58\u5206\u914d\u3002\u6e90\u7801\u5728\u8f6c\u53d1\u524d\u663e\u5f0f\u68c0\u67e5\u5e76\u8fd4\u56de EINVAL \u62d2\u7edd\u8d1f\u503c&#xff0c;\u8fd9\u662f\u4e00\u4e2a\u9762\u5411\u4e0d\u53ef\u4fe1\u914d\u7f6e\u7684\u5b89\u5168\u8bbe\u8ba1\u3002<\/li>\n<h3>\u96f6\u503c\u8bed\u4e49&#xff1a;\u8df3\u8fc7\u4e0d\u9700\u8981\u7684\u6570\u636e\u533a<\/h3>\n<p>Modbus \u670d\u52a1\u5668\u4e0d\u4e00\u5b9a\u9700\u8981\u66b4\u9732\u5168\u90e8\u56db\u7c7b\u6570\u636e\u533a\u3002\u4f8b\u5982\u7eaf\u8f93\u51fa\u578b\u8bbe\u5907\u53ef\u80fd\u6ca1\u6709\u8f93\u5165\u5bc4\u5b58\u5668&#xff0c;\u6b64\u65f6\u53ef\u5c06\u5bf9\u5e94\u53c2\u6570\u4f20 0&#xff0c;\u8be5\u6570\u7ec4\u4e0d\u4f1a\u88ab\u5206\u914d&#xff0c;\u5bf9\u5e94\u7684\u6307\u9488\u4e3a NULL&#xff1a;<\/p>\n<p>\/* \u53ea\u5206\u914d\u7ebf\u5708\u4e0e\u4fdd\u6301\u5bc4\u5b58\u5668&#xff0c;\u79bb\u6563\u8f93\u5165\u3001\u8f93\u5165\u5bc4\u5b58\u5668\u4e0d\u5206\u914d *\/<br \/>\nmb_mapping &#061; modbus_mapping_new(500, 0, 500, 0);<br \/>\n\/* \u6b64\u65f6 mb_mapping-&gt;tab_input_bits \u4e0e tab_input_registers \u5747\u4e3a NULL *\/<\/p>\n<p>\u8fd9\u79cd\u96f6\u503c\u8bed\u4e49\u5728\u6e90\u7801\u4e2d\u4f53\u73b0\u4e3a\u201c\u6309\u533a\u5206\u914d\u201d\u7684\u7ed3\u6784&#xff1a;modbus_mapping_new_start_address() \u5bf9\u6bcf\u4e2a\u6570\u636e\u533a\u5355\u72ec\u5224\u65ad nb_* &#061;&#061; 0&#xff0c;\u4e3a\u96f6\u65f6\u6307\u9488\u7f6e NULL \u4e14\u4e0d\u6267\u884c malloc&#xff0c;\u5426\u5219\u5206\u914d\u5e76\u6e05\u96f6&#xff08;\u89c1 src\/modbus.c&#xff09;\u3002\u4ed3\u5e93\u7684\u968f\u673a\u6d4b\u8bd5\u670d\u52a1\u5668\u6b63\u662f\u8fd9\u4e48\u505a\u7684&#xff1a;<\/p>\n<p>mb_mapping &#061; modbus_mapping_new(500, 500, 500, 500);<\/p>\n<p>\u89c1 tests\/random-test-server.c\u3002<\/p>\n<h3>\u5c3a\u5bf8\u4e0a\u9650&#xff1a;65536 \u4e0e MODBUS_MAX_TABLE_SIZE<\/h3>\n<p>\u7531\u4e8e Modbus \u5730\u5740\u7a7a\u95f4\u4e3a 16 \u4f4d&#xff0c;\u6bcf\u4e2a\u6570\u636e\u533a\u6700\u591a\u53ea\u80fd\u5bfb\u5740 65536 \u4e2a\u6761\u76ee\u3002nb_bits\u3001nb_input_bits\u3001nb_registers\u3001nb_input_registers \u56db\u4e2a\u53c2\u6570\u5747\u4e0d\u5f97\u8d85\u8fc7 65536&#xff1b;\u66f4\u5927\u7684\u503c\u4f1a\u88ab\u62d2\u7edd&#xff0c;\u4ee5\u907f\u514d\u7531\u4e0d\u53ef\u4fe1\u914d\u7f6e\u9a71\u52a8\u7684\u8d85\u5927\u5185\u5b58\u5206\u914d\u3002<\/p>\n<p>\u8fd9\u4e00\u7ea6\u675f\u5728\u5b9e\u73b0\u4e2d\u901a\u8fc7 MODBUS_MAX_TABLE_SIZE \u5b8f&#xff08;\u5b9a\u4e49\u4e8e src\/modbus.c&#xff0c;\u503c\u4e3a 65536&#xff09;\u843d\u5b9e&#xff1a;<\/p>\n<p>if (nb_bits &gt; MODBUS_MAX_TABLE_SIZE || nb_input_bits &gt; MODBUS_MAX_TABLE_SIZE ||<br \/>\n    nb_registers &gt; MODBUS_MAX_TABLE_SIZE ||<br \/>\n    nb_input_registers &gt; MODBUS_MAX_TABLE_SIZE) {<br \/>\n    errno &#061; EINVAL;<br \/>\n    return NULL;<br \/>\n}<\/p>\n<p>\u89c1 src\/modbus.c\u3002\u6309\u6700\u5927\u5c3a\u5bf8\u4f30\u7b97\u5185\u5b58\u5f00\u9500&#xff1a;\u7ebf\u5708\u4e0e\u79bb\u6563\u8f93\u5165\u6bcf\u4e2a\u5143\u7d20\u5360 1 \u5b57\u8282&#xff08;uint8_t&#xff09;&#xff0c;64K \u4f4d\u7ea6 64 KB&#xff1b;\u4fdd\u6301\u4e0e\u8f93\u5165\u5bc4\u5b58\u5668\u6bcf\u4e2a\u5143\u7d20\u5360 2 \u5b57\u8282&#xff08;uint16_t&#xff09;&#xff0c;64K \u5bc4\u5b58\u5668\u7ea6 128 KB\u3002\u5b9e\u8df5\u4e2d\u901a\u5e38\u8fdc\u5c0f\u4e8e\u6b64\u4e0a\u9650\u3002<\/p>\n<p>\u53e6\u5916\u9700\u8981\u6ce8\u610f&#xff0c;\u5355\u6b21 Modbus \u8bfb\u8bf7\u6c42\u7684\u6570\u91cf\u53e6\u6709\u7ea6\u675f&#xff1a;MODBUS_MAX_READ_BITS&#xff08;2000&#xff09;\u4e0e MODBUS_MAX_READ_REGISTERS&#xff08;125&#xff09;\u5b9a\u4e49\u4e8e src\/modbus.h&#xff0c;\u6620\u5c04\u6570\u7ec4\u53ea\u9700\u8986\u76d6\u8bbe\u5907\u5b9e\u9645\u4f7f\u7528\u7684\u5730\u5740\u8303\u56f4\u5373\u53ef&#xff0c;\u65e0\u9700\u4e0e\u8bf7\u6c42\u4e0a\u9650\u5bf9\u9f50\u3002<\/p>\n<h3>\u8fd4\u56de\u503c\u4e0e\u9519\u8bef\u5904\u7406<\/h3>\n<ul>\n<li>\u6210\u529f\u65f6&#xff1a;\u8fd4\u56de\u65b0\u5206\u914d\u5e76\u5df2\u6e05\u96f6\u7684 modbus_mapping_t * \u7ed3\u6784\u4f53\u3002<\/li>\n<li>\u5931\u8d25\u65f6&#xff1a;\u8fd4\u56de NULL \u5e76\u8bbe\u7f6e errno\u3002<\/li>\n<\/ul>\n<p>\u53ef\u80fd\u7684\u9519\u8bef\u7801\u5982\u4e0b&#xff1a;<\/p>\n<table>\n<tr>errno\u542b\u4e49\u89e6\u53d1\u6761\u4ef6<\/tr>\n<tbody>\n<tr>\n<td>EINVAL<\/td>\n<td>\u65e0\u6548\u53c2\u6570<\/td>\n<td>\u4efb\u4e00\u8bf7\u6c42\u7684\u6570\u7ec4\u7ef4\u5ea6\u8d85\u8fc7 65536 \u6761\u76ee&#xff08;modbus_mapping_new() \u4e2d\u8fd8\u5305\u62ec\u8d1f\u6570\u53c2\u6570&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>ENOMEM<\/td>\n<td>\u5185\u5b58\u4e0d\u8db3<\/td>\n<td>malloc \u5206\u914d\u4efb\u4e00\u6570\u7ec4\u6216\u7ed3\u6784\u4f53\u5931\u8d25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f&#xff0c;\u6e90\u7801\u5bf9\u5206\u914d\u5931\u8d25\u505a\u4e86\u6e10\u8fdb\u5f0f\u56de\u6eda&#xff1a;\u4f8b\u5982\u4fdd\u6301\u5bc4\u5b58\u5668\u5206\u914d\u5931\u8d25\u65f6&#xff0c;\u4f1a\u4f9d\u6b21\u91ca\u653e\u5df2\u5206\u914d\u7684\u8f93\u5165\u5bc4\u5b58\u5668\u3001\u79bb\u6563\u8f93\u5165\u3001\u7ebf\u5708\u6570\u7ec4\u548c\u7ed3\u6784\u4f53\u672c\u8eab&#xff0c;\u907f\u514d\u5185\u5b58\u6cc4\u6f0f&#xff08;\u89c1 src\/modbus.c&#xff09;&#xff0c;\u8c03\u7528\u65b9\u65e0\u9700\u5728\u5931\u8d25\u8def\u5f84\u4e0a\u624b\u5de5\u6e05\u7406\u90e8\u5206\u6570\u7ec4\u3002<\/p>\n<p>\u5b98\u65b9\u6587\u6863\u7ed9\u51fa\u7684\u6807\u51c6\u9519\u8bef\u5904\u7406\u6a21\u5f0f\u5982\u4e0b&#xff08;\u89c1 docs\/modbus_mapping_new.md&#xff09;&#xff1a;<\/p>\n<p>\/* The first value of each array is accessible from the 0 address. *\/<br \/>\nmb_mapping &#061; modbus_mapping_new(<br \/>\n    BITS_ADDRESS &#043; BITS_NB,<br \/>\n    INPUT_BITS_ADDRESS &#043; INPUT_BITS_NB,<br \/>\n    REGISTERS_ADDRESS &#043; REGISTERS_NB,<br \/>\n    INPUT_REGISTERS_ADDRESS &#043; INPUT_REGISTERS_NB<br \/>\n);<br \/>\nif (mb_mapping &#061;&#061; NULL) {<br \/>\n    fprintf(<br \/>\n        stderr, &#034;Failed to allocate the mapping: %s\\\\n&#034;,<br \/>\n        modbus_strerror(errno)<br \/>\n    );<br \/>\n    modbus_free(ctx);<br \/>\n    return -1;<br \/>\n}<\/p>\n<p>\u6ce8\u610f\u8be5\u793a\u4f8b\u4e2d\u4f7f\u7528\u4e86 modbus_strerror(errno) \u5c06 errno \u8f6c\u6362\u4e3a\u53ef\u8bfb\u5b57\u7b26\u4e32&#xff0c;\u5e76\u5728\u5931\u8d25\u65f6\u91ca\u653e\u6b64\u524d\u5df2\u521b\u5efa\u7684 Modbus \u4e0a\u4e0b\u6587 ctx&#xff08;\u7531 modbus_free(ctx) \u5b8c\u6210&#xff09;&#xff0c;\u968f\u540e\u4ee5 -1 \u9000\u51fa&#xff0c;\u8fd9\u662f libmodbus \u670d\u52a1\u5668\u7a0b\u5e8f\u7684\u5178\u578b\u542f\u52a8\u5e8f\u5217\u3002<\/p>\n<h3>\u5728\u670d\u52a1\u5668\u4e2d\u7684\u5b9e\u6218\u7528\u6cd5&#xff1a;\u586b\u5145\u6620\u5c04\u5e76\u5e94\u7b54\u8bf7\u6c42<\/h3>\n<p>modbus_mapping_new() \u7684\u8bbe\u8ba1\u521d\u8877\u662f\u201c\u65b9\u4fbf\u5728 Modbus \u670d\u52a1\u5668\/\u4ece\u7ad9\u4e2d\u5904\u7406\u8bf7\u6c42\u201d\u3002\u5206\u914d\u597d\u6620\u5c04\u540e&#xff0c;\u670d\u52a1\u5668\u9700\u8981&#xff1a;<\/p>\n<li>\u586b\u5145\u6570\u636e&#xff1a;\u76f4\u63a5\u5411\u6570\u7ec4\u5199\u5165\u503c&#xff08;\u7ebf\u5708\/\u79bb\u6563\u8f93\u5165\u4e3a 0 \u6216 1&#xff0c;\u5bc4\u5b58\u5668\u4e3a uint16_t&#xff09;&#xff1b;<\/li>\n<li>\u5e94\u7b54\u8bf7\u6c42&#xff1a;\u628a\u6620\u5c04\u6307\u9488\u4f20\u7ed9 modbus_reply()&#xff0c;\u7531\u5b83\u6839\u636e\u8bf7\u6c42\u4e2d\u7684\u529f\u80fd\u7801\u4e0e\u5730\u5740\u81ea\u52a8\u8bfb\u5199\u6620\u5c04\u6570\u7ec4\u5e76\u6784\u9020\u54cd\u5e94&#xff08;\u539f\u578b\u89c1 src\/modbus.h&#xff09;\u3002<\/li>\n<p>\u4ed3\u5e93\u7684\u5355\u5143\u6d4b\u8bd5\u670d\u52a1\u5668 tests\/unit-test-server.c \u6f14\u793a\u4e86\u5b8c\u6574\u6d41\u7a0b&#xff08;\u5b83\u4f7f\u7528\u5e26\u8d77\u59cb\u5730\u5740\u7684\u53d8\u4f53&#xff0c;\u4f46\u586b\u5145\u4e0e\u5e94\u7b54\u903b\u8f91\u5b8c\u5168\u76f8\u540c&#xff09;&#xff1a;<\/p>\n<p>mb_mapping &#061; modbus_mapping_new_start_address(UT_BITS_ADDRESS,<br \/>\n                                              UT_BITS_NB,<br \/>\n                                              UT_INPUT_BITS_ADDRESS,<br \/>\n                                              UT_INPUT_BITS_NB,<br \/>\n                                              UT_REGISTERS_ADDRESS,<br \/>\n                                              UT_REGISTERS_NB_MAX,<br \/>\n                                              UT_INPUT_REGISTERS_ADDRESS,<br \/>\n                                              UT_INPUT_REGISTERS_NB);<br \/>\nif (mb_mapping &#061;&#061; NULL) {<br \/>\n    fprintf(stderr, &#034;Failed to allocate the mapping: %s\\\\n&#034;, modbus_strerror(errno));<br \/>\n    modbus_free(ctx);<br \/>\n    return -1;<br \/>\n}<\/p>\n<p>\/* \u670d\u52a1\u5668\u4fa7\u586b\u5145\u53ea\u8bfb\u8f93\u5165\u503c *\/<br \/>\nmodbus_set_bits_from_bytes(<br \/>\n    mb_mapping-&gt;tab_input_bits, 0, UT_INPUT_BITS_NB, UT_INPUT_BITS_TAB);<\/p>\n<p>for (i &#061; 0; i &lt; UT_INPUT_REGISTERS_NB; i&#043;&#043;) {<br \/>\n    mb_mapping-&gt;tab_input_registers[i] &#061; UT_INPUT_REGISTERS_TAB[i];<br \/>\n}<\/p>\n<p>\u5176\u4e2d UT_BITS_ADDRESS&#xff08;0x130&#xff09;\u3001UT_REGISTERS_ADDRESS&#xff08;0x160&#xff09;\u7b49\u6d4b\u8bd5\u5730\u5740\u5b9a\u4e49\u5728 tests\/unit-test.h.in\u3002\u670d\u52a1\u5668\u4e3b\u5faa\u73af\u968f\u540e\u53cd\u590d\u8c03\u7528 modbus_receive() \u63a5\u6536\u8bf7\u6c42&#xff0c;\u5e76\u5c06\u6620\u5c04\u4ea4\u7ed9 modbus_reply(ctx, query, rc, mb_mapping) \u5904\u7406&#xff08;\u89c1 tests\/unit-test-server.c&#xff09;&#xff0c;\u9000\u51fa\u5faa\u73af\u540e\u8c03\u7528 modbus_mapping_free(mb_mapping) \u91ca\u653e\u6620\u5c04&#xff08;\u89c1 tests\/unit-test-server.c&#xff09;\u3002<\/p>\n<p>\u5e26\u5bbd\u6d4b\u8bd5\u670d\u52a1\u5668\u5219\u5c55\u793a\u4e86\u201c\u96f6\u503c\u8df3\u8fc7 &#043; \u8bf7\u6c42\u4e0a\u9650\u201d\u7684\u7ec4\u5408\u7528\u6cd5&#xff08;\u89c1 tests\/bandwidth-server-one.c \u4e0e tests\/bandwidth-server-many-up.c&#xff09;&#xff1a;<\/p>\n<p>modbus_mapping_new(MODBUS_MAX_READ_BITS, 0, MODBUS_MAX_READ_REGISTERS, 0);<\/p>\n<p>\u5373&#xff1a;\u6309\u5355\u6b21\u8bf7\u6c42\u53ef\u8bfb\u53d6\u7684\u6700\u5927\u4f4d\u6570&#xff08;2000&#xff09;\u4e0e\u6700\u5927\u5bc4\u5b58\u5668\u6570&#xff08;125&#xff09;\u5206\u914d\u7ebf\u5708\u548c\u4fdd\u6301\u5bc4\u5b58\u5668&#xff0c;\u5176\u4f59\u4e24\u7c7b\u6570\u636e\u533a\u4e0d\u5206\u914d\u3002<\/p>\n<h3>\u4e0e modbus_mapping_new_start_address() \u7684\u5173\u7cfb\u4e0e\u9009\u578b<\/h3>\n<p>\u4e24\u4e2a\u51fd\u6570\u7684\u884c\u4e3a\u5bf9\u6bd4\u5982\u4e0b&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027modbus_mapping_new()modbus_mapping_new_start_address()<\/tr>\n<tbody>\n<tr>\n<td>\u8d77\u59cb\u5730\u5740<\/td>\n<td>\u56fa\u5b9a\u5168\u90e8\u4e3a 0<\/td>\n<td>\u6bcf\u7c7b\u6570\u636e\u533a\u53ef\u72ec\u7acb\u6307\u5b9a<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u6570\u7c7b\u578b<\/td>\n<td>int<\/td>\n<td>unsigned int<\/td>\n<\/tr>\n<tr>\n<td>\u5730\u5740\u6620\u5c04\u5173\u7cfb<\/td>\n<td>\u6570\u7ec4\u4e0b\u6807 &#061;&#061; \u5730\u5740<\/td>\n<td>\u6570\u7ec4\u4e0b\u6807 &#043; start &#061;&#061; \u5730\u5740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>modbus_mapping_new() \u9002\u5408\u5730\u5740\u4ece 0 \u5f00\u59cb\u7684\u5e38\u89c4\u8bbe\u5907\u3002\u800c\u5e26\u8d77\u59cb\u5730\u5740\u7684\u53d8\u4f53\u53ef\u4ee5\u628a\u6620\u5c04\u201c\u6302\u201d\u5230\u4efb\u610f\u9ad8\u4f4d\u5730\u5740\u800c\u4e0d\u6d6a\u8d39\u5185\u5b58\u2014\u2014\u4f8b\u5982\u53ea\u66b4\u9732\u5bc4\u5b58\u5668 340&#xff5e;349&#xff0c;\u53ef\u7528 modbus_mapping_new_start_address(0, 0, 0, 0, 340, 10, 0, 0)&#xff0c;\u6b64\u65f6 tab_registers \u53ea\u5206\u914d 10 \u4e2a\u5143\u7d20&#xff0c;\u5ba2\u6237\u7aef\u8bbf\u95ee\u5730\u5740 340 \u5bf9\u5e94\u6570\u7ec4\u4e0b\u6807 0&#xff08;\u8be6\u89c1 docs\/modbus_mapping_new_start_address.md&#xff09;\u3002<\/p>\n<h3>\u91ca\u653e\u6620\u5c04&#xff1a;modbus_mapping_free()<\/h3>\n<p>\u4e0e\u5206\u914d\u914d\u5bf9\u7684\u662f\u91ca\u653e\u51fd\u6570&#xff08;\u539f\u578b\u89c1 docs\/modbus_mapping_free.md&#xff09;&#xff1a;<\/p>\n<p>void modbus_mapping_free(modbus_mapping_t *mb_mapping);<\/p>\n<p>\u5b83\u4f9d\u6b21\u91ca\u653e\u56db\u4e2a\u6570\u7ec4&#xff08;tab_input_registers\u3001tab_registers\u3001tab_input_bits\u3001tab_bits&#xff09;&#xff0c;\u6700\u540e\u91ca\u653e modbus_mapping_t \u7ed3\u6784\u4f53\u672c\u8eab&#xff1b;\u4f20\u5165 NULL \u65f6\u5b89\u5168\u8fd4\u56de&#xff0c;\u65e0\u8fd4\u56de\u503c&#xff08;\u89c1 src\/modbus.c&#xff09;\u3002<\/p>\n<p>\u52a1\u5fc5\u533a\u5206\u4e24\u7ec4\u91ca\u653e\u51fd\u6570&#xff1a;<\/p>\n<ul>\n<li>modbus_mapping_free(mb_mapping) \u2014\u2014 \u91ca\u653e\u6570\u636e\u6620\u5c04&#xff1b;<\/li>\n<li>modbus_free(ctx) \u2014\u2014 \u91ca\u653e Modbus \u4e0a\u4e0b\u6587\u3002<\/li>\n<\/ul>\n<p>\u4e24\u8005\u76f8\u4e92\u72ec\u7acb&#xff0c;\u670d\u52a1\u5668\u9000\u51fa\u65f6\u90fd\u9700\u8981\u8c03\u7528&#xff0c;\u987a\u5e8f\u901a\u5e38\u4e3a\u5148\u91ca\u653e\u6620\u5c04\u518d\u91ca\u653e\u4e0a\u4e0b\u6587&#xff08;\u89c1 tests\/unit-test-server.c&#xff09;\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<p>modbus_mapping_new() \u662f libmodbus \u670d\u52a1\u5668\u7aef\u7f16\u7a0b\u7684\u5165\u53e3\u7ea7 API&#xff1a;\u4e00\u6b21\u8c03\u7528\u5b8c\u6210\u56db\u7c7b\u6570\u636e\u533a\u7684\u5206\u914d\u4e0e\u6e05\u96f6&#xff0c;\u96f6\u503c\u53c2\u6570\u8df3\u8fc7\u4e0d\u9700\u8981\u7684\u6570\u636e\u533a&#xff0c;65536 \u4e0a\u9650\u4e0e\u8d1f\u6570\u68c0\u67e5\u63d0\u4f9b\u4e86\u9632\u5fa1\u6027\u4fdd\u62a4&#xff0c;\u5931\u8d25\u65f6 errno \u533a\u5206\u53c2\u6570\u9519\u8bef&#xff08;EINVAL&#xff09;\u4e0e\u5185\u5b58\u4e0d\u8db3&#xff08;ENOMEM&#xff09;\u3002\u7ed3\u5408 modbus_reply() \u4e0e modbus_mapping_free()&#xff0c;\u5373\u53ef\u642d\u5efa\u5b8c\u6574\u53ef\u7528\u7684 Modbus \u670d\u52a1\u5668\u3002\u76f8\u5173\u6587\u6863\u4e0e\u6e90\u7801\u53ef\u7ee7\u7eed\u9605\u8bfb&#xff1a;<\/p>\n<ul>\n<li>\u5b98\u65b9\u6587\u6863&#xff1a;docs\/modbus_mapping_new.md\u3001docs\/modbus_mapping_new_start_address.md\u3001docs\/modbus_mapping_free.md<\/li>\n<li>\u6838\u5fc3\u5b9e\u73b0&#xff1a;src\/modbus.c&#xff08;\u5206\u914d\u4e0e\u91ca\u653e&#xff09;\u3001src\/modbus.h&#xff08;\u7ed3\u6784\u4f53\u5b9a\u4e49&#xff09;<\/li>\n<li>\u53c2\u8003\u5b9e\u73b0&#xff1a;tests\/unit-test-server.c&#xff08;\u5b8c\u6574\u670d\u52a1\u5668\u6d41\u7a0b&#xff09;\u3001tests\/unit-test.h.in&#xff08;\u5730\u5740\u5e38\u91cf\u5b9a\u4e49&#xff09;<\/li>\n<\/ul>\n<p>  <img loading=\"lazy\" decoding=\"async\" class=\"gcb-icon-like\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261004083311-6ac20f476c1a4.svg\" alt=\"\" width=\"16\" height=\"16\" \/> <span class=\"gcb-like-text\">\u8d5e<\/span>  <\/p>\n<p>   <span class=\"gcb-share-text\">\u5206\u4eab<\/span>  <\/p>\n<ul class=\"gcb-tag-list\">\n<li><span class=\"gcb-tag\">\u901a\u4fe1<\/span><\/li>\n<li><span class=\"gcb-tag\">\u5d4c\u5165\u5f0f<\/span><\/li>\n<li><span class=\"gcb-tag\">\u7269\u8054\u7f51<\/span><\/li>\n<\/ul>\n<h3 class=\"gcb-project-title\">\u3010\u514d\u8d39\u4e0b\u8f7d\u94fe\u63a5\u3011libmodbus<\/h3>\n<p class=\"gcb-project-desc\">A Modbus library for Linux, Mac OS, FreeBSD and Windows<\/p>\n<p>    <span class=\"gcb-project-addr-label\">\u9879\u76ee\u5730\u5740&#xff1a;<\/span><br \/>\n    <span class=\"gcb-project-addr-link\">https:\/\/gitcode.com\/gh_mirrors\/li\/libmodbus<\/span> <\/p>\n<p>  <span class=\"gcb-project-btn\"> <span class=\"gcb-project-btn-main\">\u70b9\u51fb\u67e5\u770b<\/span> <span class=\"gcb-project-btn-sub\">\u514d\u8d39\u4e0b\u8f7d<\/span> <\/span> <\/p>\n<h4 class=\"gcb-related-title\">\u76f8\u5173\u63a8\u8350<\/h4>\n<ul class=\"gcb-related-list\">\n<li class=\"gcb-related-item\">\n<h5 class=\"gcb-related-item-title\"> libmodbus\u5e93\u4e2dmodbus_set_slave\u51fd\u6570\u8be6\u89e3<\/h5>\n<p class=\"gcb-related-item-desc\">libmodbus\u5e93\u4e2dmodbus_set_slave\u51fd\u6570\u8be6\u89e3 \u51fd\u6570\u6982\u8ff0 modbus_set_slave \u662flibmodbus\u5e93\u4e2d\u7528\u4e8e\u8bbe\u7f6eModbus\u901a\u4fe1\u4ece\u7ad9<\/p>\n<p>     <span class=\"gcb-tag\">\u901a\u4fe1<\/span><br \/>\n     <span class=\"gcb-tag\">\u5d4c\u5165\u5f0f<\/span><br \/>\n     <span class=\"gcb-tag\">\u7269\u8054\u7f51<\/span>\n      <\/li>\n<li class=\"gcb-related-item\">\n<h5 class=\"gcb-related-item-title\">Distilly SKILL.md \u5b8c\u6574\u89e3\u6790&#xff1a;\u5982\u4f55\u5c06\u4efb\u4f55\u4eba\u7684\u601d\u7ef4\u65b9\u5f0f\u84b8\u998f\u4e3a\u53ef\u590d\u7528\u7684 Agent Skill<\/h5>\n<p class=\"gcb-related-item-desc\">Distilly SKILL.md \u5b8c\u6574\u89e3\u6790&#xff1a;\u5982\u4f55\u5c06\u4efb\u4f55\u4eba\u7684\u601d\u7ef4\u65b9\u5f0f\u84b8\u998f\u4e3a\u53ef\u590d\u7528\u7684 Agent Skill 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