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libraries/ArduinoModbus/examples/RTU/ModbusRTUServerKitchenSink/ModbusRTUServerKitchenSink.ino

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+/*
+  Modbus RTU Server Kitchen Sink
+
+  This sketch creates a Modbus RTU Server and demonstrates
+  how to use various Modbus Server APIs.
+
+  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 18 July 2018
+  by Sandeep Mistry
+*/
+
+#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
+#include <ArduinoModbus.h>
+
+const int numCoils = 10;
+const int numDiscreteInputs = 10;
+const int numHoldingRegisters = 10;
+const int numInputRegisters = 10;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  Serial.println("Modbus RTU Server Kitchen Sink");
+
+  // start the Modbus RTU server, with (slave) id 42
+  if (!ModbusRTUServer.begin(42, 9600)) {
+    Serial.println("Failed to start Modbus RTU Server!");
+    while (1);
+  }
+
+  // configure coils at address 0x00
+  ModbusRTUServer.configureCoils(0x00, numCoils);
+
+  // configure discrete inputs at address 0x00
+  ModbusRTUServer.configureDiscreteInputs(0x00, numDiscreteInputs);
+
+  // configure holding registers at address 0x00
+  ModbusRTUServer.configureHoldingRegisters(0x00, numHoldingRegisters);
+
+  // configure input registers at address 0x00
+  ModbusRTUServer.configureInputRegisters(0x00, numInputRegisters);
+}
+
+void loop() {
+  // poll for Modbus RTU requests
+  ModbusRTUServer.poll();
+
+  // map the coil values to the discrete input values
+  for (int i = 0; i < numCoils; i++) {
+    int coilValue = ModbusRTUServer.coilRead(i);
+
+    ModbusRTUServer.discreteInputWrite(i, coilValue);
+  }
+
+  // map the holding register values to the input register values
+  for (int i = 0; i < numHoldingRegisters; i++) {
+    long holdingRegisterValue = ModbusRTUServer.holdingRegisterRead(i);
+
+    ModbusRTUServer.inputRegisterWrite(i, holdingRegisterValue);
+  }
+}