{"id":11784,"date":"2023-02-13T17:02:50","date_gmt":"2023-02-13T09:02:50","guid":{"rendered":"https:\/\/www.modbus.cn\/?p=11784"},"modified":"2023-02-13T17:06:58","modified_gmt":"2023-02-13T09:06:58","slug":"ji-yu-c-yu-yan-qian-ru-shi-xi-tong-shi-xian-modbus-tcp-tong-xin-de-shi-li-dai-ma","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/11784.html","title":{"rendered":"\u57fa\u4e8eC\u8bed\u8a00\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5b9e\u73b0modbus TCP\u901a\u4fe1\u7684\u793a\u4f8b\u4ee3\u7801"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-wpcom-hljs\"><pre class=\"\"><code>#include &lt;stdio.h>\n#include &lt;stdlib.h>\n#include &lt;string.h>\n#include &lt;errno.h>\n#include &lt;unistd.h>\n#include &lt;fcntl.h>\n#include &lt;termios.h>\n#include &lt;sys\/socket.h>\n#include &lt;netinet\/in.h>\n#include &lt;arpa\/inet.h>\n\n#define PORT 502\n\n#define SERVER_IP \"192.168.0.100\"\n#define DEVICE_ID 1\n\n#define BUFFER_SIZE 1024\n\nint main() {\n    \/\/ \u521b\u5efaTCP\u8fde\u63a5\n    int sockfd;\n    struct sockaddr_in server_addr;\n\n    sockfd = socket(AF_INET, SOCK_STREAM, 0);\n    if (sockfd == -1) {\n        printf(\"Failed to create socket: %s\\n\", strerror(errno));\n        return 1;\n    }\n\n    server_addr.sin_family = AF_INET;\n    server_addr.sin_port = htons(PORT);\n    server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);\n\n    if (connect(sockfd, (struct sockaddr *)&amp;server_addr, sizeof(server_addr)) == -1) {\n        printf(\"Failed to connect to server: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Connected to server successfully.\\n\");\n\n    \/\/ \u51c6\u5907modbus\u8bf7\u6c42\n    unsigned char request[BUFFER_SIZE];\n    unsigned char response[BUFFER_SIZE];\n    int request_length, response_length;\n\n    \/\/ \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\n    int register_address = 0;\n    int register_count = 4;\n    request_length = modbus_build_request(request, DEVICE_ID, MODBUS_FC_READ_HOLDING_REGISTERS, register_address, register_count);\n\n    \/\/ \u53d1\u9001modbus\u8bf7\u6c42\n    if (send(sockfd, request, request_length, 0) == -1) {\n        printf(\"Failed to send request: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Sent request successfully.\\n\");\n\n    \/\/ \u63a5\u6536modbus\u54cd\u5e94\n    response_length = recv(sockfd, response, BUFFER_SIZE, 0);\n    if (response_length == -1) {\n        printf(\"Failed to receive response: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Received response successfully.\\n\");\n\n    \/\/ \u89e3\u6790modbus\u54cd\u5e94\n    int register_value = modbus_get_response_value(response, response_length);\n\n    printf(\"Register value: %d\\n\", register_value);\n\n    \/\/ \u5173\u95edTCP\u8fde\u63a5\n    close(sockfd);\n\n    return 0;\n}\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8ff0\u793a\u4f8b\u4ee3\u7801\u4f7f\u7528\u4e86modbus\u534f\u8bae\u4e2d\u7684\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\u529f\u80fd\uff0c\u901a\u8fc7TCP\u8fde\u63a5\u53d1\u9001\u8bf7\u6c42\uff0c\u63a5\u6536\u54cd\u5e94\u5e76\u89e3\u6790\u54cd\u5e94\uff0c\u6700\u540e\u5173\u95edTCP\u8fde\u63a5\u3002\u60a8\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u4fee\u6539\u4ee3\u7801\u4e2d\u7684SERVER_IP\u548cDEVICE_ID\u7b49\u53c2\u6570\uff0c\u4ee5\u53ca\u8bfb\u53d6\u7684\u4fdd\u6301\u5bc4\u5b58\u5668\u5730\u5740\u548c\u6570\u91cf\u3002<\/p>\n\n\n\n<div class=\"wp-block-wpcom-hljs\"><pre class=\"\"><code>#include &lt;stdio.h>\n#include &lt;stdlib.h>\n#include &lt;string.h>\n#include &lt;errno.h>\n#include &lt;unistd.h>\n#include &lt;fcntl.h>\n#include &lt;termios.h>\n#include &lt;sys\/socket.h>\n#include &lt;netinet\/in.h>\n#include &lt;arpa\/inet.h>\n\n#define PORT 502\n\n#define SERVER_IP \"192.168.0.100\"\n#define DEVICE_ID 1\n\n#define BUFFER_SIZE 1024\n\nint main() {\n    \/\/ \u521b\u5efaTCP\u8fde\u63a5\n    int sockfd;\n    struct sockaddr_in server_addr;\n\n    sockfd = socket(AF_INET, SOCK_STREAM, 0);\n    if (sockfd == -1) {\n        printf(\"Failed to create socket: %s\\n\", strerror(errno));\n        return 1;\n    }\n\n    server_addr.sin_family = AF_INET;\n    server_addr.sin_port = htons(PORT);\n    server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);\n\n    if (connect(sockfd, (struct sockaddr *)&amp;server_addr, sizeof(server_addr)) == -1) {\n        printf(\"Failed to connect to server: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Connected to server successfully.\\n\");\n\n    \/\/ \u51c6\u5907modbus\u8bf7\u6c42\n    unsigned char request[BUFFER_SIZE];\n    unsigned char response[BUFFER_SIZE];\n    int request_length, response_length;\n\n    \/\/ \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\n    int register_address = 0;\n    int register_count = 4;\n    request_length = modbus_build_request(request, DEVICE_ID, MODBUS_FC_READ_HOLDING_REGISTERS, register_address, register_count);\n\n    \/\/ \u53d1\u9001modbus\u8bf7\u6c42\n    if (send(sockfd, request, request_length, 0) == -1) {\n        printf(\"Failed to send request: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Sent request successfully.\\n\");\n\n    \/\/ \u63a5\u6536modbus\u54cd\u5e94\n    response_length = recv(sockfd, response, BUFFER_SIZE, 0);\n    if (response_length == -1) {\n        printf(\"Failed to receive response: %s\\n\", strerror(errno));\n        close(sockfd);\n        return 1;\n    }\n\n    printf(\"Received response successfully.\\n\");\n\n    \/\/ \u89e3\u6790modbus\u54cd\u5e94\n    int register_value = modbus_get_response_value(response, response_length);\n\n    printf(\"Register value: %d\\n\", register_value);\n\n    \/\/ \u5173\u95edTCP\u8fde\u63a5\n    close(sockfd);\n\n    return 0;\n}\n<\/code><\/pre><\/div>\n<span id=\"magicpostMarker\"><\/span>","protected":false},"excerpt":{"rendered":"<p>\u4e0a\u8ff0\u793a\u4f8b\u4ee3\u7801\u4f7f\u7528\u4e86modbus\u534f\u8bae\u4e2d\u7684\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\u529f\u80fd\uff0c\u901a\u8fc7&#8230;<\/p>","protected":false},"author":1,"featured_media":27977,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[691],"tags":[1281,1284,1083,1494,237,1442],"class_list":["post-11784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-modbus-code-base","tag-_","tag-errno","tag-modbus","tag-sockfd-return-1-printf","tag-tcp","tag-1442"],"_links":{"self":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/11784","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=11784"}],"version-history":[{"count":0,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/11784\/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=11784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=11784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=11784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}