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libraries/ArduinoModbus/examples/RTU/ModbusRTUServerLED/ModbusRTUServerLED.ino

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+/*
+  Modbus RTU Server LED
+
+  This sketch creates a Modbus RTU Server with a simulated coil.
+  The value of the simulated coil is set on the LED
+
+  Circuit:
+   - MKR board
+   - MKR 485 shield
+     - ISO GND connected to GND of the Modbus RTU server
+     - Y connected to A/Y of the Modbus RTU client
+     - Z connected to B/Z of the Modbus RTU client
+     - Jumper positions
+       - FULL set to OFF
+       - Z \/\/ Y set to OFF
+
+  created 16 July 2018
+  by Sandeep Mistry
+*/
+
+#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(0x00, 1);
+}
+
+void loop() {
+  // poll for Modbus RTU requests
+  int packetReceived = ModbusRTUServer.poll();
+
+  if(packetReceived) {
+    // read the current value of the coil
+    int coilValue = ModbusRTUServer.coilRead(0x00);
+  
+    if (coilValue) {
+      // coil value set, turn LED on
+      digitalWrite(ledPin, HIGH);
+    } else {
+      // coil value clear, turn LED off
+      digitalWrite(ledPin, LOW);
+    }
+  }
+}