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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);
+}