arduino modbus ESP32
时间: 2023-10-02 12:07:02 浏览: 58
The ESP32 can communicate using the Modbus protocol by using the Modbus library for Arduino. This library can be downloaded and installed in the Arduino IDE, and it provides functions to implement both Modbus master and slave devices.
To set up the ESP32 as a Modbus master, you need to create an instance of the ModbusMaster class and specify the communication parameters (baud rate, data bits, parity, etc.). Then you can use the provided functions to read or write data from/to Modbus slave devices.
To set up the ESP32 as a Modbus slave, you need to create an instance of the ModbusSlave class and specify the communication parameters, as well as the data to be exposed to the master device. You can use the provided functions to handle incoming Modbus requests and send responses back to the master.
Here is an example code for setting up the ESP32 as a Modbus master:
```
#include <ModbusMaster.h>
ModbusMaster node;
void setup() {
Serial.begin(115200);
node.begin(9600, SERIAL_8N1); // set communication parameters
}
void loop() {
uint16_t data;
if (node.readHoldingRegisters(1, 1, &data) == node.ku8MBSuccess) {
Serial.println(data); // print the received data
}
delay(1000);
}
```
And here is an example code for setting up the ESP32 as a Modbus slave:
```
#include <ModbusSlave.h>
ModbusSlave node;
void setup() {
Serial.begin(115200);
node.begin(1, 9600, SERIAL_8N1); // set slave address and communication parameters
node.addHreg(1); // expose a holding register with address 1
}
void loop() {
node.poll(); // handle incoming Modbus requests
delay(10);
}
```