eg

firmware/libs/simplemodbusng

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+Subproject commit 1079f442a5591a92baa38ddd98668b3ff162bb13

firmware/testing/modbus_sender.ino

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+#include <ModbusMaster.h>
+#include <SoftwareSerial.h>
+
+// Define the pins for SoftwareSerial communication
+#define RX_PIN 7  // RX pin for SoftwareSerial
+#define TX_PIN 6  // TX pin for SoftwareSerial
+#define TX_ENABLE_PIN 4 // Pin to control RS485 direction
+#define DE_ENABLE_PIN 5  
+
+// Create a SoftwareSerial object
+SoftwareSerial modbusSerial(RX_PIN, TX_PIN);
+
+// Create an instance of the ModbusMaster class
+ModbusMaster node;
+
+// Function to control RS485 transmit enable
+void preTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, HIGH); // Enable RS485 transmit
+}
+
+void postTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, LOW); // Disable RS485 transmit
+}
+
+void setup()
+{
+  // Initialize the built-in serial port for debugging
+  Serial.begin(9600);
+
+  // Initialize SoftwareSerial for Modbus communication
+  modbusSerial.begin(9600);
+
+  pinMode(DE_ENABLE_PIN, OUTPUT);
+  digitalWrite(DE_ENABLE_PIN, HIGH);
+
+
+  // Set the pin mode for the RS485 control pin
+  pinMode(TX_ENABLE_PIN, OUTPUT);
+  digitalWrite(TX_ENABLE_PIN, LOW);
+  
+
+  // Modbus communication setup
+  node.begin(1, modbusSerial); // Slave ID = 1, use modbusSerial for RS485 communication
+
+  // Set callbacks to handle RS485 flow control
+  node.preTransmission(preTransmission);
+  node.postTransmission(postTransmission);
+}
+
+void loop()
+{
+  static uint16_t count = 0; 
+  uint8_t result;
+  uint16_t data[6];
+
+  // Read 6 holding registers starting at address 0x0000
+  result = node.readHoldingRegisters(0x0000, 6);
+
+  // Check if the read was successful
+  if (result == node.ku8MBSuccess)
+  {
+    Serial.print("Read successful: ");
+    for (uint8_t j = 0; j < 6; j++)
+    {
+      data[j] = node.getResponseBuffer(j);
+      Serial.print(data[j], HEX);
+      Serial.print(" ");
+    }
+    Serial.println();
+  }
+  else
+  {
+    Serial.print("Read error: ");
+    Serial.println(result, HEX);
+  }
+
+   // Write the count value to the holding register at address 0x0001
+  result = node.writeSingleRegister(0x0001, count);
+
+
+  // Check if the write was successful
+  if (result == node.ku8MBSuccess)
+  {
+    Serial.print("Write successful: ");
+    Serial.println(count);
+  }
+  else
+  {
+    Serial.print("Write error: ");
+    Serial.println(result, HEX);
+  }
+
+  // Increment the count value
+  count++;
+  // Delay before the next read cycle
+  delay(1000);
+}

firmware/testing/send1.ino

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+#include <ModbusMaster.h>
+#include <SoftwareSerial.h>
+
+// Define the pins for SoftwareSerial communication
+#define RX_PIN 13  // RX pin for SoftwareSerial
+#define TX_PIN 12  // TX pin for SoftwareSerial
+#define TX_ENABLE_PIN 4 // Pin to control RS485 direction
+#define DE_ENABLE_PIN 5  
+
+// Create a SoftwareSerial object
+SoftwareSerial modbusSerial(RX_PIN, TX_PIN);
+
+// Create an instance of the ModbusMaster class
+ModbusMaster node;
+
+// Function to control RS485 transmit enable
+void preTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, HIGH); // Enable RS485 transmit
+  digitalWrite(DE_ENABLE_PIN, HIGH);
+}
+
+void postTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, LOW); // Disable RS485 transmit
+  digitalWrite(DE_ENABLE_PIN, LOW);
+}
+
+void setup()
+{
+  // Initialize the built-in serial port for debugging
+  Serial.begin(9600);
+
+  // Initialize SoftwareSerial for Modbus communication
+  modbusSerial.begin(9600);
+
+  pinMode(DE_ENABLE_PIN, OUTPUT);
+  digitalWrite(DE_ENABLE_PIN, HIGH);
+
+
+  // Set the pin mode for the RS485 control pin
+  pinMode(TX_ENABLE_PIN, OUTPUT);
+  digitalWrite(TX_ENABLE_PIN, LOW);
+  
+
+  // Modbus communication setup
+  node.begin(1, modbusSerial); // Slave ID = 1, use modbusSerial for RS485 communication
+
+  // Set callbacks to handle RS485 flow control
+  node.preTransmission(preTransmission);
+  node.postTransmission(postTransmission);
+}
+
+void loop()
+{
+  static uint16_t count = 0; 
+  uint8_t result;
+  uint16_t data[6];
+  Serial.print("Loop:");
+ Serial.println(count);
+   // Write the count value to the holding register at address 0x0001
+  result = node.writeSingleRegister(0x0001, count);
+
+
+  // Check if the write was successful
+  if (result == node.ku8MBSuccess)
+  {
+    Serial.print("Write successful: ");
+    Serial.println(count);
+  }
+  else
+  {
+    Serial.print("Write error: ");
+    Serial.println(result, HEX);
+  }
+
+  // Increment the count value
+  count++;
+  // Delay before the next read cycle
+  delay(1000);
+}

firmware/testing/send2.ino

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+#include <ModbusMaster.h>
+#include <SoftwareSerial.h>
+
+// Define the pins for SoftwareSerial communication
+#define RX_PIN 3  // RX pin for SoftwareSerial
+#define TX_PIN 4  // TX pin for SoftwareSerial
+#define TX_ENABLE_PIN 2 // Pin to control RS485 direction
+#define DE_ENABLE_PIN 5  
+
+// Create a SoftwareSerial object
+SoftwareSerial modbusSerial(RX_PIN, TX_PIN);
+
+// Create an instance of the ModbusMaster class
+ModbusMaster node;
+
+// Function to control RS485 transmit enable
+void preTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, HIGH); // Enable RS485 transmit
+  digitalWrite(DE_ENABLE_PIN, HIGH);
+}
+
+void postTransmission()
+{
+  digitalWrite(TX_ENABLE_PIN, LOW); // Disable RS485 transmit
+  digitalWrite(DE_ENABLE_PIN, LOW);
+}
+
+void setup()
+{
+  // Initialize the built-in serial port for debugging
+  Serial.begin(9600);
+
+  // Initialize SoftwareSerial for Modbus communication
+  modbusSerial.begin(9600);
+
+  pinMode(DE_ENABLE_PIN, OUTPUT);
+  digitalWrite(DE_ENABLE_PIN, HIGH);
+
+
+  // Set the pin mode for the RS485 control pin
+  pinMode(TX_ENABLE_PIN, OUTPUT);
+  digitalWrite(TX_ENABLE_PIN, LOW);
+  
+
+  // Modbus communication setup
+  node.begin(1, modbusSerial); // Slave ID = 1, use modbusSerial for RS485 communication
+
+  // Set callbacks to handle RS485 flow control
+  node.preTransmission(preTransmission);
+  node.postTransmission(postTransmission);
+}
+
+void loop()
+{
+  static uint16_t count = 0; 
+  uint8_t result;
+  uint16_t data[6];
+  Serial.print("Loop:");
+ Serial.println(count);
+   // Write the count value to the holding register at address 0x0001
+  result = node.writeSingleRegister(0x0001, count);
+
+
+  // Check if the write was successful
+  if (result == node.ku8MBSuccess)
+  {
+    Serial.print("Write successful: ");
+    Serial.println(count);
+  }
+  else
+  {
+    Serial.print("Write error: ");
+    Serial.println(result, HEX);
+  }
+
+  // Increment the count value
+  count++;
+  // Delay before the next read cycle
+  delay(1000);
+}

firmware/testing/serial1.ino

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+
+/*-----( Import needed libraries )-----*/
+#include <SoftwareSerial.h>
+/*-----( Declare Constants and Pin Numbers )-----*/
+#define SSerialRX        13  //Serial Receive pin
+#define SSerialTX        12  //Serial Transmit pin
+
+#define SSerialTxControl 4   //RS485 Direction control
+#define RS485Transmit    HIGH
+#define RS485Receive     LOW
+
+#define Pin13LED         9
+
+/*-----( Declare objects )-----*/
+SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX
+
+/*-----( Declare Variables )-----*/
+int byteReceived;
+int byteSend;
+
+void setup()   /****** SETUP: RUNS ONCE ******/
+{
+  // Start the built-in serial port, probably to Serial Monitor
+  Serial.begin(9600);
+  Serial.println("Remote connector");  // Can be ignored
+
+  pinMode(Pin13LED, OUTPUT);
+  pinMode(SSerialTxControl, OUTPUT);
+
+  digitalWrite(SSerialTxControl, RS485Receive);  // Init Transceiver
+
+  // Start the software serial port, to another device
+  RS485Serial.begin(9600);   // set the data rate 
+}//--(end setup )---
+ 
+
+void loop()   /****** LOOP: RUNS CONSTANTLY ******/
+{
+  //Copy input data to output  
+  if (RS485Serial.available())
+  {
+    byteSend = RS485Serial.read();   // Read the byte 
+
+    digitalWrite(Pin13LED, HIGH);  // Show activity
+    delay(1);
+    digitalWrite(Pin13LED, LOW);
+
+    digitalWrite(SSerialTxControl, RS485Transmit);  // Enable RS485 Transmit    
+    RS485Serial.write(byteSend); // Send the byte back
+    //delay(10);
+    digitalWrite(SSerialTxControl, RS485Receive);  // Disable RS485 Transmit      
+    Serial.println("Bounce");
+    Serial.println(byteSend);
+//    delay(100);
+  }// End If RS485SerialAvailable
+
+}//--(end main loop )---

firmware/testing/serial2.ino

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+
+/*-----( Import needed libraries )-----*/
+#include <SoftwareSerial.h>
+/*-----( Declare Constants and Pin Numbers )-----*/
+#define SSerialRX        13  //Serial Receive pin
+#define SSerialTX        12  //Serial Transmit pin
+
+#define SSerialTxControl 4   //RS485 Direction control
+
+#define RS485Transmit    HIGH
+#define RS485Receive     LOW
+
+#define Pin13LED         9
+
+/*-----( Declare objects )-----*/
+SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX
+
+/*-----( Declare Variables )-----*/
+int byteReceived;
+int byteSend;
+
+void setup()   /****** SETUP: RUNS ONCE ******/
+{
+  // Start the built-in serial port, probably to Serial Monitor
+  Serial.begin(9600);
+  Serial.println("Master connector");
+
+
+  pinMode(Pin13LED, OUTPUT);
+  pinMode(SSerialTxControl, OUTPUT);
+
+  digitalWrite(SSerialTxControl, RS485Receive);  // Init Transceiver   
+
+  // Start the software serial port, to another device
+  RS485Serial.begin(9600);   // set the data rate 
+
+}//--(end setup )---
+
+
+void loop()   /****** LOOP: RUNS CONSTANTLY ******/
+{
+  digitalWrite(Pin13LED, HIGH);  // Show activity
+  if (Serial.available())
+  {
+    byteReceived = Serial.read();
+
+    digitalWrite(SSerialTxControl, RS485Transmit);  // Enable RS485 Transmit   
+    RS485Serial.write(byteReceived);          // Send byte to Remote Arduino
+
+    digitalWrite(Pin13LED, LOW);  // Show activity    
+    //Serial.println("\nRead Local");
+    delay(10);
+    digitalWrite(SSerialTxControl, RS485Receive);  // Disable RS485 Transmit       
+  } 
+
+  if (RS485Serial.available())  //Look for data from other Arduino
+   {
+    digitalWrite(Pin13LED, HIGH);  // Show activity
+    byteReceived = RS485Serial.read();    // Read received byte
+    Serial.println("Received ");
+    Serial.write(byteReceived);        // Show on Serial Monitor
+    
+    delay(10);
+    digitalWrite(Pin13LED, LOW);  // Show activity   
+   }
+
+}//--(end main loop )---
+
+/*-----( Declare User-written Functions )-----*/
+
+//NONE
+//*********( THE END )***********