C言語組み込みシステムによるmodbus TCP通信のサンプルコード

#include stdio.h>
#include stdlib.h>
#string.hを含む
#errno.hを含む
#unistd.hを含む
#fcntl.hを含む
#include termios.h>
#include sys/socket.h>
#include netinet/in.h>
#include arpa/inet.h>

ポート50 2の定義

#ine_IP "192.168.0.100"
#define DEVICE_ID 1

#define BUFFER_SIZE 1024

int main {
    //TCPコネクションの作成
    int sockfd;
    構造体sockaddr_in server_addr;

    s = sAF_INET SOCK_0;
    if s == -1 {
        printf "Failed to create socket %s\n" strerror errno;
        リターン1;
    }

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons PORT;
    server_._.s_=__IP;

    if connect sockfd struct sockaddr * server_addr sizeof server_addr = -1 {
        printf "Failed to connect to server %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Connected to server successfully.\n"nClose;

    //modbusリクエストの準備
    unsigned char request[BUFFER_SIZE];
    unsigned char response[BUFFER_SIZE];
    int request__;

    //リードホールドレジスタ
    int register_address = 0
    int register_count = 4;
    request_= mod_request request DEVICE_ID MODBUS_FC__HOING_ISTERS register_register_count;

    //modbusリクエストを送信
    if send srequest request_0 == -1 {
        printf "Failed to send request %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Sent request successfully.\ N 'N';

    //modbus応答の受信
    response_length = recv sockfd response BUFFER_SIZE 0;
    if_== -1 {
        printf "Failed to receive response %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Received response successfully.\ N 'N';

    //modbus応答を解析する
    int register_value = modbus_get_response_value response_length;

    printf "Register value %d\n" register_value;

    TCPコネクションを閉じる
    close sockfd;

    リターン0;
}

#include stdio.h>
#include stdlib.h>
#string.hを含む
#errno.hを含む
#unistd.hを含む
#fcntl.hを含む
#include termios.h>
#include sys/socket.h>
#include netinet/in.h>
#include arpa/inet.h>

ポート50 2の定義

#ine_IP "192.168.0.100"
#define DEVICE_ID 1

#define BUFFER_SIZE 1024

int main {
    //TCPコネクションの作成
    int sockfd;
    構造体sockaddr_in server_addr;

    s = sAF_INET SOCK_0;
    if s == -1 {
        printf "Failed to create socket %s\n" strerror errno;
        リターン1;
    }

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons PORT;
    server_._.s_=__IP;

    if connect sockfd struct sockaddr * server_addr sizeof server_addr = -1 {
        printf "Failed to connect to server %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Connected to server successfully.\n"nClose;

    //modbusリクエストの準備
    unsigned char request[BUFFER_SIZE];
    unsigned char response[BUFFER_SIZE];
    int request__;

    //リードホールドレジスタ
    int register_address = 0
    int register_count = 4;
    request_= mod_request request DEVICE_ID MODBUS_FC__HOING_ISTERS register_register_count;

    //modbusリクエストを送信
    if send srequest request_0 == -1 {
        printf "Failed to send request %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Sent request successfully.\ N 'N';

    //modbus応答の受信
    response_length = recv sockfd response BUFFER_SIZE 0;
    if_== -1 {
        printf "Failed to receive response %s\n" strerror errno;
        close sockfd;
        リターン1;
    }

    printf "Received response successfully.\ N 'N';

    //modbus応答を解析する
    int register_value = modbus_get_response_value response_length;

    printf "Register value %d\n" register_value;

    TCPコネクションを閉じる
    close sockfd;

    リターン0;
}