【ESP32】ESP32 Arduino Modbus TCP主站程序

ESP32 Arduino Modbus TCP主站程序

• • 安装库
  • 代码

安装库

代码

#include <WiFi.h>
#include <Modbus.h>
#include <ModbusIP_ESP8266.h>
 
const char* ssid = "A000";
const char* password = "KONGTIAO";
IPAddress remote(10,35,0,123);  // Address of Modbus Slave device
const int serverPort = 502;
ModbusIP mb; 
 
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
 
  mb.client();//设置esp32为主机
}
 
const int LOOP_COUNT = 10;
uint16_t res = 0;
uint8_t show = LOOP_COUNT;

void loop() {
  if (mb.isConnected(remote)) {   // Check if connection to Modbus Slave is established
    mb.readHreg(remote, 0, &res);  // Initiate Read Coil from Modbus Slave
  } else {
    mb.connect(remote);           // Try to connect if no connection
  }
  mb.task();                      // Common local Modbus task
  delay(1000);                     // Pulling interval
  Serial.println(res);
 
}
/**
uint16_t readHreg(IPAddress ip, uint16_t offset, uint16_t* value, uint16_t numregs = 1, cbTransaction cb = nullptr, uint8_t uint = MODBUSIP_UNIT);
uint16_t readIreg(IPAddress ip, uint16_t offset, uint16_t* value, uint16_t numregs = 1, cbTransaction cb = nullptr, uint8_t uint = MODBUSIP_UNIT);

uint16_t readHreg(uint8_t slaveId, uint16_t offset, uint16_t* value, uint16_t numregs = 1, cbTransaction cb = nullptr);
uint16_t readIreg(uint8_t slaveId, uint16_t offset, uint16_t* value, uint16_t numregs = 1, cbTransaction cb = nullptr);
*/