Hello, I'm doing a project that needs to connect a display named Samkoon EA-043A with Arduino UNO. I have tried to communicate these 2 devices using RS485 Modbus and tried a sample code. but I have received errors like this.
main
#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
#include <ArduinoModbus.h>
const int ledPin = LED_BUILTIN;
void setup() {
Serial.begin(9600);
Serial.println("Modbus RTU Server LED");
// start the Modbus RTU server, with (slave) id 1
if (!ModbusRTUServer.begin(1, 9600)) {
Serial.println("Failed to start Modbus RTU Server!");
while (1);
}
// configure the LED
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
// configure a single coil at address 0x00
ModbusRTUServer.configureCoils(X01, 1);
}
void loop() {
// poll for Modbus RTU requests
ModbusRTUServer.poll();
// read the current value of the coil
int coilValue = ModbusRTUServer.coilRead(0x00);
if (coilValue) {
// coil value set, turn LED on
digitalWrite(ledPin, HIGH);
Serial.println("done");
} else {
// coil value clear, turn LED off
digitalWrite(ledPin, LOW);
}
}
error
Arduino: 1.8.15 (Windows 10), Board: "Arduino Uno"
C:\Users\User\AppData\Local\Temp\arduino_modified_sketch_354942\ModbusRTUServerLED.ino: In function 'void setup()':
ModbusRTUServerLED:42:34: error: 'X01' was not declared in this scope
ModbusRTUServer.configureCoils(X01, 1);
^~~
C:\Users\User\AppData\Local\Temp\arduino_modified_sketch_354942\ModbusRTUServerLED.ino:42:34: note: suggested alternative: 'B01'
ModbusRTUServer.configureCoils(X01, 1);
^~~
B01
exit status 1
'X01' was not declared in this scope
This report would have more information with
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option enabled in File -> Preferences.
the button created in the samkoon display with all the details is as followed.
