First commit

firmware/Modbus-Serial/examples/Lamp/Lamp.ino

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+/**
+    @file Lamp.ino
+    Modbus-Arduino Example - Lamp (Modbus Serial)
+    Copyright (C) 2023 Pascal JEAN aka epsilonrt
+    Copyright (C) 2014 André Sarmento Barbosa
+    https://github.com/epsilonrt/modbus-serial
+*/
+
+#include <ModbusSerial.h>
+
+// Used Pins
+const int LedPin = 13; // Change that to match your led
+const int TxenPin = -1; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+const byte SlaveId = 10;
+// Modbus Registers Offsets (0-9999)
+const int Lamp1Coil = 0;
+
+#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+// ModbusSerial object
+ModbusSerial mb (MySerial, SlaveId, TxenPin);
+
+void setup() {
+
+  MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  // MySerial.begin (Baudrate, MB_PARITY_EVEN);
+  
+  mb.config (Baudrate);
+  mb.setAdditionalServerData ("LAMP"); // for Report Server ID function (0x11)
+
+  // Set LedPin mode
+  pinMode (LedPin, OUTPUT);
+  // Add Lamp1Coil register - Use addCoil() for digital outputs
+  mb.addCoil (Lamp1Coil);
+}
+
+void loop() {
+  
+  // Call once inside loop() - all magic here
+  mb.task();
+
+  // Attach LedPin to Lamp1Coil register
+  digitalWrite (LedPin, mb.Coil (Lamp1Coil));
+}

firmware/Modbus-Serial/examples/LampDimmer/LampDimmer.ino

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+/**
+    @file LampDimmer.ino
+    Modbus-Arduino Example - Lamp dimmer (Modbus Serial)
+    Copyright (C) 2023 Pascal JEAN aka epsilonrt
+    https://github.com/epsilonrt/modbus-serial
+*/
+
+#include <ModbusSerial.h>
+
+// Used Pins
+const int LedPin = 3; // Must be PWM output !
+const int TxenPin = -1; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+const byte SlaveId = 11; // our Modbus slave address (1-247)
+// Modbus Registers Offsets (0-9999), PDU adressing ! from the data model we have to add 1
+const int Lamp1Coil = 0;
+const int Lamp1Hreg = 0;
+
+#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+// ModbusSerial object
+ModbusSerial mb (MySerial, SlaveId, TxenPin);
+
+// Lamp status variables
+bool lampOn = true;
+word lampDimming = 128;
+
+void setup() {
+
+  MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  // MySerial.begin (Baudrate, MB_PARITY_EVEN);
+
+  mb.config (Baudrate);
+  mb.setAdditionalServerData ("LDIMMER"); // for Report Server ID function (0x11)
+
+  // Set LedPin
+  pinMode (LedPin, OUTPUT);
+  mb.addCoil (Lamp1Coil, lampOn);
+  mb.addHreg (Lamp1Hreg, lampDimming);
+
+  // The led flashes 20 times to signal the end of setup,
+  // then it is set to its default state.
+  for (int i = 0; i < 20; i++) {
+
+    digitalWrite (LedPin, HIGH);
+    delay (50);
+    digitalWrite (LedPin, LOW);
+    delay (100);
+  }
+  analogWrite (LedPin, (lampOn ? lampDimming : 0));
+}
+
+void loop() {
+
+  // Call once inside loop() - all magic here
+  mb.task();
+
+  if (mb.Coil (Lamp1Coil) != lampOn) {
+    // If coil was modified
+
+    lampOn = mb.Coil (Lamp1Coil);
+    if (lampOn) {
+
+      analogWrite (LedPin, lampDimming);
+    }
+    else {
+
+      analogWrite (LedPin, 0);
+    }
+  }
+
+  if ( (mb.Hreg (Lamp1Hreg) & 0x00FF) != lampDimming) {
+    // If holding register was modified (only LSB will used)
+
+    lampDimming = (mb.Hreg (Lamp1Hreg) & 0x00FF);
+    if (lampOn) {
+
+      analogWrite (LedPin, lampDimming);
+    }
+  }
+}

firmware/Modbus-Serial/examples/Servo/Servo.ino

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+/**
+    @file Servo.ino
+    Copyright (C) 2023 Pascal JEAN aka epsilonrt
+    Copyright (C) 2014 André Sarmento Barbosa
+    https://github.com/epsilonrt/modbus-serial
+
+    Use Servo lib
+    This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor.
+    https://registry.platformio.org/libraries/arduino-libraries/Servo
+*/
+
+#include <ModbusSerial.h>
+#include <Servo.h>
+
+// Used Pins
+const int servoPin = 9;
+const int TxenPin = -1; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+const byte SlaveId = 12;
+// Modbus Registers Offsets (0-9999)
+const int ServoHreg = 0;
+
+#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+// ModbusSerial object
+ModbusSerial mb (MySerial, SlaveId, TxenPin);
+// Servo object
+Servo servo;
+
+void setup() {
+
+  MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  // MySerial.begin (Baudrate, MB_PARITY_EVEN);
+
+  mb.config (Baudrate);
+  mb.setAdditionalServerData ("SWITCH"); // for Report Server ID function (0x11)
+
+  // Attaches the servo pin to the servo object
+  servo.attach (servoPin);
+  // Add ServoHreg register - Use addHreg() for analog outpus or to store values in device
+  mb.addHreg (ServoHreg, 127);
+}
+
+void loop() {
+
+  //Call once inside loop() - all magic here
+  mb.task();
+
+  //Attach switchPin to SWITCH_ISTS register
+  servo.write (mb.Hreg (ServoHreg));
+  delay (15);
+}

firmware/Modbus-Serial/examples/Switch/Switch.ino

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+/**
+    @file Switch.ino
+    Modbus-Arduino Example - Switch (Modbus Serial)
+    Copyright (C) 2023 Pascal JEAN aka epsilonrt
+    Copyright (C) 2014 André Sarmento Barbosa
+    https://github.com/epsilonrt/modbus-serial
+*/
+
+#include <ModbusSerial.h>
+
+// Used Pins
+const int SwitchPin = 3;
+const int TxenPin = -1; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+const byte SlaveId = 13;
+// Modbus Registers Offsets (0-9999)
+const int SwitchIsts = 0;
+
+#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+// ModbusSerial object
+ModbusSerial mb (MySerial, SlaveId, TxenPin);
+
+void setup() {
+  
+  MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  // MySerial.begin (Baudrate, MB_PARITY_EVEN);
+  
+  mb.config (Baudrate);
+  mb.setAdditionalServerData ("SWITCH"); // for Report Server ID function (0x11)
+
+  // Set SwitchPin mode
+  pinMode (SwitchPin, INPUT);
+  // Add SwitchIsts register - Use addIsts() for digital inputs
+  mb.addIsts (SwitchIsts);
+}
+
+void loop() {
+  //Call once inside loop() - all magic here
+  mb.task();
+
+  //Attach SwitchPin to SwitchIsts register
+  mb.Ists (SwitchIsts, digitalRead (SwitchPin));
+}

firmware/Modbus-Serial/examples/TempSensor/TempSensor.ino

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+/**
+  @file TempSensor.ino
+  Modbus-Arduino Example - TempSensor (Modbus Serial)
+    Copyright (C) 2023 Pascal JEAN aka epsilonrt
+    Copyright (C) 2014 André Sarmento Barbosa
+    https://github.com/epsilonrt/modbus-serial
+*/
+
+#include <ModbusSerial.h>
+
+// Used Pins
+const int SensorPin = A0;
+const int TxenPin = -1; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+const byte SlaveId = 14;
+// Modbus Registers Offsets (0-9999)
+const int SensorIreg = 0;
+
+#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+// ModbusSerial object
+ModbusSerial mb (MySerial, SlaveId, TxenPin);
+
+long ts;
+
+void setup() {
+
+  MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  // MySerial.begin (Baudrate, MB_PARITY_EVEN);
+
+  mb.config (Baudrate);
+  mb.setAdditionalServerData ("TEMP_SENSOR"); // for Report Server ID function (0x11)
+
+
+  // Add SensorIreg register - Use addIreg() for analog Inputs
+  mb.addIreg (SensorIreg);
+
+  ts = millis();
+}
+
+void loop() {
+  
+  // Call once inside loop() - all magic here
+  mb.task();
+
+  // Read each two seconds
+  if (millis() > ts + 2000) {
+    
+    ts = millis();
+    // Setting raw value (0-1024)
+    mb.Ireg (SensorIreg, analogRead (SensorPin));
+  }
+}