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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));
+  }
+}