modbusTcp 从站和主站

主要测试读保持寄存器，地址4xxxx开始。不废话直接上代码

下面是从站（server）代码：


#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <iostream>#include "modbus.h"
#include "modbus-tcp.h"
#include "modbus-version.h"#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>#define NB_CONNECTION    5//读保持寄存器地址数据的定义
const uint16_t UT_REGISTERS_ADDRESS = 0;
/* Raise a manual exception when this adress is used for the first byte */
const uint16_t UT_REGISTERS_ADDRESS_SPECIAL = 0;
const uint16_t UT_REGISTERS_NB = 0x10;
const int UT_REGISTERS_TAB[] = { 0x022B, 0x0001, 0x0064 };
const float test[] = { 123.123, 4.012, 5.789, 12345.34, 223.4, 34.2, 33.44, 234.204};
/* If the following value is used, a bad response is sent.It's better to test with a lower value thanUT_REGISTERS_NB_POINTS to try to raise a segfault. */
const uint16_t UT_REGISTERS_NB_SPECIAL = 0x2;modbus_t *ctx = NULL;
int server_socket;
modbus_mapping_t *mb_mapping;static void close_sigint(int dummy)
{close(server_socket);modbus_free(ctx);modbus_mapping_free(mb_mapping);exit(dummy);
}int FloatTohex(float HEX)//浮点数到十六进制转换
{return *( int *)&HEX;
}int main(void)
{int master_socket;int rc;int header_length;fd_set refset;fd_set rdset;/* Maximum file descriptor number */int fdmax;ctx = modbus_new_tcp("10.88.33.26", 10086);header_length = modbus_get_header_length(ctx);//new一个modbus的映射空间Amb_mapping = modbus_mapping_new(0,//读线圈0,//读离散量输入UT_REGISTERS_ADDRESS + UT_REGISTERS_NB,//读保持寄存器0);//读输入寄存器if (mb_mapping == NULL){fprintf(stderr, "Failed to allocate the mapping: %s\n",modbus_strerror(errno));modbus_free(ctx);return -1;}/**初始化读保持寄存器**/for(int i=0; i<8; i++){uint16_t aimReg[2] = { 0 };MODBUS_SET_INT32_TO_INT16(aimReg, 0, FloatTohex(test[i]));std::cout<<std::hex<<FloatTohex(test[i])<<"; " << std::hex<<aimReg[0]<<", "<<std::hex<<aimReg[1]<<"\n";for(int j = 0; j< 2; j++){mb_mapping->tab_registers[UT_REGISTERS_ADDRESS+i*2+j]= aimReg[j];}}server_socket = modbus_tcp_listen(ctx, NB_CONNECTION);signal(SIGINT, close_sigint);/* Clear the reference set of socket */FD_ZERO(&refset);/* Add the server socket */FD_SET(server_socket, &refset);/* Keep track of the max file descriptor */fdmax = server_socket;for (;;){rdset = refset;if (select(fdmax+1, &rdset, NULL, NULL, NULL) == -1){perror("Server select() failure.");close_sigint(1);}/* Run through the existing connections looking for data to be* read */for (master_socket = 0; master_socket <= fdmax; master_socket++){if (FD_ISSET(master_socket, &rdset)){if (master_socket == server_socket){/* A client is asking a new connection */socklen_t addrlen;struct sockaddr_in clientaddr;int newfd;/* Handle new connections */addrlen = sizeof(clientaddr);memset(&clientaddr, 0, sizeof(clientaddr));newfd = accept(server_socket, (struct sockaddr *)&clientaddr, &addrlen);if (newfd == -1){perror("Server accept() error");}else{FD_SET(newfd, &refset);if (newfd > fdmax){/* Keep track of the maximum */fdmax = newfd;}printf("New connection from %s:%d on socket %d\n", inet_ntoa(clientaddr.sin_addr), clientaddr.sin_port, newfd);}}else{/* An already connected master has sent a new query */uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH];modbus_set_socket(ctx, master_socket);rc = modbus_receive(ctx, query);if (rc != -1){modbus_reply(ctx, query, rc, mb_mapping);}else{/* Connection closed by the client, end of server */printf("Connection closed on socket %d\n", master_socket);close(master_socket);/* Remove from reference set */FD_CLR(master_socket, &refset);if (master_socket == fdmax){fdmax--;}}}}}}return 0;
}

我们可以通过modscan32工具来读取数据测试。

下面是主站（client）代码:

#include <stdio.h>#ifndef _MSC_VER
#include <unistd.h>
#endif#include <string.h>
#include <stdlib.h>
#include <errno.h>//包含Modbus相关头文件
#include "modbus.h"
#include "time.h"//相关参数设置
#define LOOP    1           //循环次数
#define ADDRESS_START   0       //测试寄存器起始地址
#define ADDRESS_END 15  //测试寄存器结束地址int FloatTohex(float HEX){ return *( int *)&HEX; }int main(void)
{modbus_t* ctx = NULL;int ret = -1;int nums = 0;int addr = 0;int i = 0;int tmp = 0;uint16_t* tab_rq_registers = NULL;uint16_t* tab_rp_registers = NULL;//设置随机种子srand((int)time(0));//1. 创建一个TCP类型的变量ctx = modbus_new_tcp("10.88.33.26", 10086);if (NULL == ctx){fprintf(stderr, "Error: %s\n", modbus_strerror(errno));return 1;}else{printf("设置TCP成功\n");}//2. 设置Debug模式ret = modbus_set_debug(ctx, TRUE);if (-1 == ret){fprintf(stderr, "Error: 设置Debug模式失败");modbus_free(ctx);return 1;}//3. 连接Serverret = modbus_connect(ctx);if (-1 == ret){fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));modbus_free(ctx);return 1;}//4. 计算需测试的寄存器个数nums = ADDRESS_END - ADDRESS_START;//5. 申请内存 保存发送和接收的数据tab_rq_registers = (uint16_t*)malloc((nums + 1) * sizeof(uint16_t));if (NULL == tab_rq_registers){fprintf(stderr, "malloc failed\n");modbus_free(ctx);return 1;}else{memset(tab_rq_registers, 0, (nums + 1) * sizeof(uint16_t));}//7. 测试保持寄存器的单个读写
//随机数字const float test[] = { 13.123, 24.012, 5.789, 233.23,11.22,33.44,55.66, 77.88};for(int i=0; i< 8; i++){uint16_t aimReg[2] = { 0 };MODBUS_SET_INT32_TO_INT16(aimReg, 0, FloatTohex(test[i]));for(int j = 0; j< 2; j++){tab_rq_registers[i*2+j]= aimReg[j];}}//换行printf("\n");addr = ADDRESS_START;ret = modbus_write_registers(ctx, addr, nums + 1, tab_rq_registers);if (nums + 1 != ret){printf("Error modbus_write_registers: %d\n", ret);printf("Address: %d nums: %d\n", addr, nums + 1);}else{//读取printf("success to write");}//8. 释放内存free(tab_rq_registers);//9. 断开连接modbus_close(ctx);modbus_free(ctx);return 0;
}

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