fprintf(stderr,"Connection failed:%s ", modbus_strerror(errno)); modbus_free(ctx); return -1; } //从地址0开始连续读取10个 rc =modbus_read_registers(ctx,0,10,tab_reg); if (rc ==-1) { fprintf(stderr,"%s ",modbus_strerror(errno)); return -1; } for (i=0;i 左右滑动查看完整内...
首先创建一个连接 modbus_t*ctx =modbus_new_tcp("172.17.64.54",9999);while(modbus_connect(ctx) ==-1l) { std::cout <<"Error: "<<modbus_strerror(errno) << std::endl; } 之后释放此连接 modbus_close(ctx);modbus_free(ctx); 此时ctx指针没有被置空,如果不重置该指针会导致向原来的已经希望释...
int modbus_connect(modbus_t *ctx); //例子 modbus_t *ctx; ctx = modbus_new_tcp("127.0.0.1", 502); if (modbus_connect(ctx) == -1) { fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10...
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; } rc = modbus_read_registers(ctx, 0, 10, tab_reg); if (rc == -1) { fprintf(stderr, "Read failed: %s\n", modbus_strerror(errno)); return -1; } for (i = 0;...
{fprintf(stderr,"Connection failed:%sn", modbus_strerror(errno));modbusfree(ctx);return-1; }//申请存储空间并初始化intnb = ADDRESS_END - ADDRESS_START; tab_rp_bits = (uint8_t* )malloc(nb *sizeof(uint8_t));memset(tab_rp_bits,0, nb *sizeof(uint8_t));//读取一个线圈intaddr =...
(stderr,"Connexion failed: %s\n",modbus_strerror(errno));modbus_free(ctx);return-1;}modbus_set_slave(ctx,slaveAddr);//设置从站地址,当前为1modbus_set_response_timeout(ctx,1,0);//设置响应时间/** modbus_read_bits 读线圈 fc=1* modbus_read_input_bits 读输入线圈 fc=2* modbus_read_...
起始地址uint16_t reg[6];// 用于存储读取到的6个保持寄存器的值intaddr =0;// 从寄存器地址 0 开始读取intnum_regs =6;// 读取 6 个寄存器intrc = modbus_read_registers(ctx, addr, num_regs, reg);if(rc == -1) {fprintf(stderr,"Failed to read registers: %s\n", modbus_strerror(errno)...
modbus_strerror(errno)); modbus_free(ctx); return -1; } /* Allocate and initialize the different memory spaces */ nb = ADDRESS_END - ADDRESS_START; tab_rq_bits = (uint8_t *)malloc(nb * sizeof(uint8_t)); memset(tab_rq_bits, 0, nb * sizeof(uint8_t)); ...
}// 设置Modbus主机从机地址modbus_set_slave(ctx,1);// 打开Modbus RTU连接if(modbus_connect(ctx) ==-1) {fprintf(stderr,"无法连接到Modbus RTU从机: %s\n", modbus_strerror(errno)); modbus_free(ctx);exit(1); }// 读取Modbus寄存器rc = modbus_read_registers(ctx,0,1, tab_reg);if(rc ...
(stderr, "写入寄存器失败: %s\n", modbus_strerror(errno)); } else { printf("成功写入值%d到寄存器0\n", value); } sleep(2); // 每两秒写入一次 } pthread_exit(NULL);}int main(void){ modbus_t *ctx; pthread_t tid1, tid2; ctx = modbus_new_tcp("192.168.1.100", 502); modbus_...