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libraries/ArduinoModbus/examples/RTU/ModbusRTUClientKitchenSink/ModbusRTUClientKitchenSink.ino

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+/*
+  Modbus RTU Client Kitchen Sink
+
+  This sketch creates a Modbus RTU Client and demonstrates
+  how to use various Modbus Client 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 server
+     - Z connected to B/Z of the Modbus RTU server
+     - Jumper positions
+       - FULL set to OFF
+       - Z \/\/ Y set to ON
+
+  created 18 July 2018
+  by Sandeep Mistry
+*/
+
+#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
+#include <ArduinoModbus.h>
+
+int counter = 0;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  Serial.println("Modbus RTU Client Kitchen Sink");
+
+  // start the Modbus RTU client
+  if (!ModbusRTUClient.begin(9600)) {
+    Serial.println("Failed to start Modbus RTU Client!");
+    while (1);
+  }
+}
+
+void loop() {
+  writeCoilValues();
+
+  readCoilValues();
+
+  readDiscreteInputValues();
+
+  writeHoldingRegisterValues();
+
+  readHoldingRegisterValues();
+
+  readInputRegisterValues();
+
+  counter++;
+
+  delay(5000);
+  Serial.println();
+}
+
+void writeCoilValues() {
+  // set the coils to 1 when counter is odd
+  byte coilValue = ((counter % 2) == 0) ? 0x00 : 0x01;
+
+  Serial.print("Writing Coil values ... ");
+
+  // write 10 Coil values to (slave) id 42, address 0x00
+  ModbusRTUClient.beginTransmission(42, COILS, 0x00, 10);
+  for (int i = 0; i < 10; i++) {
+    ModbusRTUClient.write(coilValue);
+  }
+  if (!ModbusRTUClient.endTransmission()) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+  }
+
+  // Alternatively, to write a single Coil value use:
+  // ModbusRTUClient.coilWrite(...)
+}
+
+void readCoilValues() {
+  Serial.print("Reading Coil values ... ");
+
+  // read 10 Coil values from (slave) id 42, address 0x00
+  if (!ModbusRTUClient.requestFrom(42, COILS, 0x00, 10)) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+
+    while (ModbusRTUClient.available()) {
+      Serial.print(ModbusRTUClient.read());
+      Serial.print(' ');
+    }
+    Serial.println();
+  }
+
+  // Alternatively, to read a single Coil value use:
+  // ModbusRTUClient.coilRead(...)
+}
+
+void readDiscreteInputValues() {
+  Serial.print("Reading Discrete Input values ... ");
+
+  // read 10 Discrete Input values from (slave) id 42, address 0x00
+  if (!ModbusRTUClient.requestFrom(42, DISCRETE_INPUTS, 0x00, 10)) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+
+    while (ModbusRTUClient.available()) {
+      Serial.print(ModbusRTUClient.read());
+      Serial.print(' ');
+    }
+    Serial.println();
+  }
+
+  // Alternatively, to read a single Discrete Input value use:
+  // ModbusRTUClient.discreteInputRead(...)
+}
+
+void writeHoldingRegisterValues() {
+  // set the Holding Register values to counter
+
+  Serial.print("Writing Holding Registers values ... ");
+
+  // write 10 coil values to (slave) id 42, address 0x00
+  ModbusRTUClient.beginTransmission(42, HOLDING_REGISTERS, 0x00, 10);
+  for (int i = 0; i < 10; i++) {
+    ModbusRTUClient.write(counter);
+  }
+  if (!ModbusRTUClient.endTransmission()) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+  }
+
+  // Alternatively, to write a single Holding Register value use:
+  // ModbusRTUClient.holdingRegisterWrite(...)
+}
+
+void readHoldingRegisterValues() {
+  Serial.print("Reading Input Register values ... ");
+
+  // read 10 Input Register values from (slave) id 42, address 0x00
+  if (!ModbusRTUClient.requestFrom(42, HOLDING_REGISTERS, 0x00, 10)) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+
+    while (ModbusRTUClient.available()) {
+      Serial.print(ModbusRTUClient.read());
+      Serial.print(' ');
+    }
+    Serial.println();
+  }
+
+  // Alternatively, to read a single Holding Register value use:
+  // ModbusRTUClient.holdingRegisterRead(...)
+}
+
+void readInputRegisterValues() {
+  Serial.print("Reading input register values ... ");
+
+  // read 10 discrete input values from (slave) id 42,
+  if (!ModbusRTUClient.requestFrom(42, INPUT_REGISTERS, 0x00, 10)) {
+    Serial.print("failed! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    Serial.println("success");
+
+    while (ModbusRTUClient.available()) {
+      Serial.print(ModbusRTUClient.read());
+      Serial.print(' ');
+    }
+    Serial.println();
+  }
+
+  // Alternatively, to read a single Input Register value use:
+  // ModbusRTUClient.inputRegisterRead(...)
+}