esp32 modbus server

Yes, the ESP32 can act as a Modbus server. There are libraries available for the ESP32 that enable it to communicate with other devices over the Modbus protocol. One such library is the ModbusMasterESP32 library, which can be used to implement Modbus RTU and Modbus TCP communication on the ESP32. Another library is the ESP32ModbusTCP library, which provides a Modbus TCP server implementation for the ESP32.

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arduino modbus ESP32 Server

Here is an example code for creating a Modbus TCP server using an ESP32 and Arduino IDE:

#include <WiFi.h>
#include <ModbusTCPSlave.h>

// WiFi credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Modbus TCP server settings
const IPAddress ip(192, 168, 1, 100);
const uint16_t port = 502;
const uint16_t coilsCount = 8;
uint8_t coils[coilsCount];

// Modbus TCP server object
ModbusTCPSlave modbusServer;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("WiFi connected!");

  // Set the IP address and port of the Modbus TCP server
  modbusServer.configServer(ip, port);

  // Initialize coils
  for (uint16_t i = 0; i < coilsCount; i++) {
    coils[i] = 0;
  }

  // Add coils to the Modbus TCP server
  modbusServer.addCoils(0, coilsCount, coils);

  Serial.println("Modbus TCP server started.");
}

void loop() {
  // Handle Modbus TCP requests
  modbusServer.task();
}

In this code, the ESP32 is connected to a WiFi network using the `WiFi.h` library. The Modbus TCP server is created using the `ModbusTCPSlave.h` library. The IP address and port of the server are set using the `configServer()` method. Coils are initialized and added to the server using the `addCoils()` method. Finally, the `task()` method is called in the `loop()` function to handle Modbus TCP requests.

You can modify this code to add other types of Modbus data, such as holding registers or input registers, by using the appropriate methods provided by the `ModbusTCPSlave` class.

ESP8266wifi通信TCP MODBUS方式接收数据

ESP8266是一款高性价比的WiFi模块，可以通过TCP MODBUS方式接收数据。下面是一个简单的示例代码：

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ModbusIP.h>

// 定义WiFi网络名称和密码
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// 定义MODBUS TCP服务器地址和端口
IPAddress server(192, 168, 1, 10);
const int port = 502;

// 创建MODBUS IP客户端
ModbusIP mb;

void setup() {
  // 初始化串口
  Serial.begin(9600);

  // 连接WiFi网络
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  // 设置MODBUS IP客户端参数
  mb.client();
  mb.begin(server, port);
  mb.setID(1);
}

void loop() {
  // 读取MODBUS寄存器数据
  uint16_t data[2];
  mb.readHoldingRegisters(0, 2, data);

  // 输出数据到串口
  Serial.print("Data 1: ");
  Serial.println(data[0]);
  Serial.print("Data 2: ");
  Serial.println(data[1]);

  // 延迟1秒钟
  delay(1000);
}

在上面的示例代码中，首先需要定义WiFi网络名称和密码，以及MODBUS TCP服务器地址和端口。然后创建一个MODBUS IP客户端，并设置客户端ID和参数。在主循环中，使用`mb.readHoldingRegisters()`函数读取MODBUS寄存器数据，然后将数据输出到串口，并延迟1秒钟。需要注意的是，MODBUS寄存器地址从0开始计数。