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libraries/ArduinoModbus/examples/RTU/ModbusRTUClientToggle/ModbusRTUClientToggle.ino

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+/*
+  Modbus RTU Client Toggle
+
+  This sketch toggles the coil of a Modbus RTU server connected via RS485
+  on and off every second.
+
+  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 server
+     - Z connected to B/Z of the Modbus RTU server
+     - Jumper positions
+       - FULL set to OFF
+       - Z \/\/ Y set to ON
+
+  created 16 July 2018
+  by Sandeep Mistry
+*/
+
+#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
+#include <ArduinoModbus.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  Serial.println("Modbus RTU Client Toggle");
+
+  // start the Modbus RTU client
+  if (!ModbusRTUClient.begin(9600)) {
+    Serial.println("Failed to start Modbus RTU Client!");
+    while (1);
+  }
+}
+
+void loop() {
+  // for (slave) id 1: write the value of 0x01, to the coil at address 0x00 
+  if (!ModbusRTUClient.coilWrite(1, 0x00, 0x01)) {
+    Serial.print("Failed to write coil! ");
+    Serial.println(ModbusRTUClient.lastError());
+  }
+
+  // wait for 1 second
+  delay(1000);
+
+  // for (slave) id 1: write the value of 0x00, to the coil at address 0x00 
+  if (!ModbusRTUClient.coilWrite(1, 0x00, 0x00)) {
+    Serial.print("Failed to write coil! ");
+    Serial.println(ModbusRTUClient.lastError());
+  }
+
+  // wait for 1 second
+  delay(1000);
+}