Modbus-RTU从机测试:test_rtu_slave.c,创建从机设备,地址为1,初始化了3个保持寄存器,地址分别为15/16/17,数据分别为0x1001/0x1002/0x1003。 #include "stdio.h"#include "stdlib.h"#include "string.h"#include "modbus.h"#define PORT_NAME "COM2"int main(int argc, char *argv[]){int ret = 0...
/* Receive the request from a modbus master */int modbus_receive(modbus_t *ctx, uint8_t *req){if (ctx == NULL) {errno = EINVAL;return -1;}return ctx->backend->receive(ctx, req);} 7.2modbus_reply /* Send a response to the received request.Analyses the request and constructs a r...
1)int _modbus_receive_msg(modbus_t *ctx, uint8_t *msg, msg_type_t msg_type) 本函数可以用于处理来自主机的请求,返回接受到的字符的数量,如果成功,则返回uint8_t数组中的消息(即主机发送的命令),否则返回-1。 2)int modbus_reply(modbus_t *ctx, const uint8_t *req, int req_length, modbus_...
1)int _modbus_receive_msg(modbus_t *ctx, uint8_t *msg, msg_type_t msg_type) 本函数可以用于处理来自主机的请求,返回接受到的字符的数量,如果成功,则返回uint8_t数组中的消息(即主机发送的命令),否则返回-1。 2)int modbus_reply(modbus_t *ctx, const uint8_t *req, int req_length, modbus_...
(errno));modbus_free(ctx);returnFALSE;}modbus_set_slave(ctx,slaveAddr);//设置从站地址,当前为13intrc=modbus_receive(ctx,querySlave);//querySlave 保存收到的数据包 主站发送过来的modbus_reply(ctx,querySlave,rc,htsmb_mapping);//处理数据包,对htsmb_mapping 进行读写操作modbus_free(ctx);//关闭...
rc =modbus_receive(ctx,query);if(rc!=-1) { modbus_reply(ctx,query, rc,mb_mapping); } } MODBUS_API int modbus_get_response_timeout (modbus_t * ctx, uint32_t * to_sec, uint32_t * to_usec); MODBUS_API int modbus_set_response_timeout (modbus_t * ctx, uint32_t * to_sec,...
elseif(reply->error() !=QModbusDevice::NoError) {34qDebug()<< (tr("Write response error: %1 (code: 0x%2)").35arg(reply->errorString()).arg(reply->error(), -1,16),5000);36}37reply->deleteLater();38});39}else{40//broadcast replies return immediately41reply->deleteLater();42...
问使用pymodbus作为串行/RTU主机运行ArduinoModbus的Modbus丢失字节错误EN在现代工业自动化系统中，PLC（...
uint8_t mb_reply[MODBUS_TCP_MAX_ADU_LENGTH]; uint16_t tab_reg[64] = {0}; char dev_name[32] ="/dev/uart2";#ifndef RT_USING_POSIX_STDIOsprintf(dev_name,"%s","uart2");#endifctx = modbus_new_rtu(dev_name,115200,'N',8,1); ...
m = modbus(Transport,Port,Name,Value)specifies additional options with one or more name-value pair arguments using any of the previous syntaxes. For example, you can specifyNumRetries, the number of retries to perform if there is no reply from the server after a timeout. ...