ctx = modbus_new_tcp("127.0.0.1", 1502);<\/pre><\/div>\n\n\n\n2. \u8bbe\u7f6eModbus\u6620\u5c04<\/h4>\n\n\n\n
Modbus\u6620\u5c04\u662f\u670d\u52a1\u5668\u5b58\u50a8\u5176\u6570\u636e\uff08\u6bd4\u5982\u7ebf\u5708\u3001\u79bb\u6563\u8f93\u5165\u3001\u4fdd\u6301\u5bc4\u5b58\u5668\u548c\u8f93\u5165\u5bc4\u5b58\u5668\uff09\u7684\u65b9\u5f0f\u3002\u4f7f\u7528modbus_mapping_new<\/code>\u6765\u5206\u914d\u5e76\u521d\u59cb\u5316\u8fd9\u4e9b\u6570\u636e\u533a\uff1a<\/p>\n\n\n\nmb_mapping = modbus_mapping_new(MODBUS_MAX_READ_BITS, 0, MODBUS_MAX_READ_REGISTERS, 0);<\/pre><\/div>\n\n\n\n\u5982\u679c\u6620\u5c04\u521b\u5efa\u5931\u8d25\uff0c\u670d\u52a1\u5668\u5c06\u6253\u5370\u9519\u8bef\u6d88\u606f\u5e76\u9000\u51fa\u3002<\/p>\n\n\n\n
3. \u76d1\u542c\u8fde\u63a5<\/h4>\n\n\n\n
\u4f7f\u7528modbus_tcp_listen<\/code>\u51fd\u6570\u6765\u76d1\u542c\u7f51\u7edc\u8fde\u63a5\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2asocket\u63cf\u8ff0\u7b26\u3002\u670d\u52a1\u5668\u80fd\u591f\u5904\u7406\u7684\u6700\u5927\u8fde\u63a5\u6570\u7531NB_CONNECTION<\/code>\u5b8f\u5b9a\u4e49\uff1a<\/p>\n\n\n\nserver_socket = modbus_tcp_listen(ctx, NB_CONNECTION);<\/pre><\/div>\n\n\n\n4. \u5904\u7406SIGINT\u4fe1\u53f7<\/h4>\n\n\n\n
\u4e3a\u4e86\u80fd\u591f\u4f18\u96c5\u5730\u5173\u95ed\u670d\u52a1\u5668\u5e76\u91ca\u653e\u8d44\u6e90\uff0c\u6211\u4eec\u4f7f\u7528signal<\/code>\u51fd\u6570\u6765\u6355\u83b7SIGINT\u4fe1\u53f7\uff08\u901a\u5e38\u7531Ctrl+C\u5f15\u53d1\uff09\uff0c\u5e76\u5c06\u5176\u5173\u8054\u5230close_sigint<\/code>\u51fd\u6570\uff1a<\/p>\n\n\n\nsignal(SIGINT, close_sigint);<\/pre><\/div>\n\n\n\nclose_sigint<\/code>\u51fd\u6570\u5173\u95edsocket\uff0c\u91ca\u653eModbus\u4e0a\u4e0b\u6587\u548c\u6620\u5c04\uff0c\u7136\u540e\u9000\u51fa\u7a0b\u5e8f\u3002<\/p>\n\n\n\n5. \u4e3b\u5faa\u73af<\/h4>\n\n\n\n
\u670d\u52a1\u5668\u8fd0\u884c\u5728\u4e00\u4e2a\u65e0\u9650\u5faa\u73af\u4e2d\uff0c\u4f7f\u7528select<\/code>\u51fd\u6570\u6765\u76d1\u542csocket\u4e0a\u7684\u6d3b\u52a8\u3002\u5982\u679cselect<\/code>\u68c0\u6d4b\u5230\u6d3b\u52a8\uff0c\u670d\u52a1\u5668\u5c06\u68c0\u67e5\u662f\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u8fd8\u662f\u5df2\u5efa\u7acb\u8fde\u63a5\u7684\u6570\u636e\u8bf7\u6c42\uff1a<\/p>\n\n\n\nif (master_socket == server_socket) {\n \/\/ \u5904\u7406\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\n} else {\n \/\/ \u5904\u7406\u6765\u81ea\u5df2\u8fde\u63a5\u5ba2\u6237\u7aef\u7684\u6570\u636e\n}<\/pre><\/div>\n\n\n\n\u5bf9\u4e8e\u65b0\u7684\u8fde\u63a5\uff0c\u670d\u52a1\u5668\u63a5\u53d7\u8fde\u63a5\u5e76\u5c06\u65b0socket\u6dfb\u52a0\u5230\u76d1\u542c\u96c6\u5408\u4e2d\u3002\u5bf9\u4e8e\u6570\u636e\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u4f7f\u7528modbus_receive<\/code>\u63a5\u6536\u6570\u636e\uff0c\u7136\u540e\u4f7f\u7528modbus_reply<\/code>\u53d1\u9001\u54cd\u5e94\u3002<\/p>\n\n\n\n6. \u6027\u80fd\u8bc4\u4f30<\/h4>\n\n\n\n
\u4e3a\u4e86\u8bc4\u4f30\u670d\u52a1\u5668\u7684\u6027\u80fd\uff0c\u4ee3\u7801\u4e2d\u52a0\u5165\u4e86\u5bf9\u4f20\u8f93\u6570\u636e\u901f\u7387\u7684\u8ba1\u7b97\u3002\u670d\u52a1\u5668\u8ba1\u7b97\u5728\u7ed9\u5b9a\u65f6\u95f4\u5185\u6210\u529f\u5904\u7406\u7684\u4f4d\uff08bits\uff09\u548c\u5bc4\u5b58\u5668\uff08registers\uff09\u7684\u6570\u91cf\uff0c\u4ece\u800c\u5f97\u5230\u70b9\/\u79d2\u548cKiB\/\u79d2\u7684\u4f20\u8f93\u901f\u7387\uff1a<\/p>\n\n\n\n
rate = (n_loop * nb_points) * G_MSEC_PER_SEC \/ (end - start);\nprintf("* %d points\/s\\n", rate);<\/pre><\/div>\n\n\n\n\u8fd9\u4e9b\u6027\u80fd\u6307\u6807\u5bf9\u4e8e\u4f18\u5316\u670d\u52a1\u5668\u8bbe\u7f6e\u548c\u7f51\u7edc\u914d\u7f6e\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n
\u7ed3\u8bba<\/h4>\n\n\n\n
\u901a\u8fc7C\u8bed\u8a00\u548clibmodbus\u5e93\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5b9e\u73b0\u4e00\u4e2aModbus TCP\u670d\u52a1\u5668\uff0c\u5b83\u4e0d\u4ec5\u652f\u6301\u591a\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u8fd8\u80fd\u591f\u63d0\u4f9b\u5173\u4e8e\u5176\u6027\u80fd\u7684\u5b9e\u65f6\u6570\u636e\u3002\u8fd9\u4e3a\u5de5\u4e1a\u5e94\u7528\u4e2d\u7684\u8bbe\u5907\u901a\u4fe1\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f3a\u5927\u4e14\u7075\u6d3b\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/span>","protected":false},"excerpt":{"rendered":"\u5728\u5de5\u4e1a\u81ea\u52a8\u5316\u9886\u57df\uff0cModbus\u534f\u8bae\u56e0\u5176\u7b80\u6d01\u6027\u548c\u5e7f\u6cdb\u652f\u6301\u800c\u5e38\u88ab…<\/p>","protected":false},"author":1,"featured_media":27977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[691],"tags":[646,694,1936,237,1807],"class_list":["post-27705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-modbus-code-base","tag-c","tag-libmodbus","tag-socket","tag-tcp","tag-1807"],"_links":{"self":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/27705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/comments?post=27705"}],"version-history":[{"count":0,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/27705\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media\/27977"}],"wp:attachment":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media?parent=27705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=27705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=27705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}