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sandeepmistrysandeepmistry
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Add initial examples: RTU + TCP x Client + Server
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‎examples/RTU/ModbusRTUClientToggle/ModbusRTUClientToggle.ino

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/*
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Modbus RTU Client Toggle
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This sketch toggles the coil of a Modbus RTU server connected via RS485
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on and off every second.
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Circuit:
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- MKR board
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- MKR 485 shield
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- ISO GND connected to GND of the Modbus RTU server
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- Y connected to A/Y of the Modbus RTU server
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- Z connected to B/Z of the Modbus RTU server
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- Jumper positions
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- FULL set to OFF
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- Z \/\/ Y set to ON
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created 16 July 2018
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by Sandeep Mistry
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*/
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#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
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#include <ArduinoModbus.h>
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void setup() {
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Serial.begin(9600);
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while (!Serial);
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Serial.println("Modbus RTU Client Toggle");
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// start the Modbus RTU client
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if (!ModbusRTUClient.begin(9600)) {
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Serial.println("Failed to start Modbus RTU Client!");
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while (1);
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}
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// send requests to (slave) ID 1
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ModbusRTUClient.setId(1);
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}
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void loop() {
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// set value of coil at address 0x00 to 0x01
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if (!ModbusRTUClient.writeCoil(0x00, 0x01)) {
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Serial.print("Failed to write coil! ");
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Serial.println(ModbusRTUClient.lastError());
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}
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// wait for 1 second
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delay(1000);
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// set value of coil at address 0x00 to 0x00
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if (!ModbusRTUClient.writeCoil(0x00, 0x00)) {
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Serial.print("Failed to write coil! ");
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Serial.println(ModbusRTUClient.lastError());
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}
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// wait for 1 second
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delay(1000);
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}

‎examples/RTU/ModbusRTUServerLED/ModbusRTUServerLED.ino

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/*
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Modbus RTU Server LED
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This sketch creates a Modbus RTU Server with a simulated coil.
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The value of the simulated coil is set on the LED
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Circuit:
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- MKR board
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- MKR 485 shield
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- ISO GND connected to GND of the Modbus RTU server
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- Y connected to A/Y of the Modbus RTU client
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- Z connected to B/Z of the Modbus RTU client
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- Jumper positions
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- FULL set to OFF
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- Z \/\/ Y set to OFF
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created 16 July 2018
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by Sandeep Mistry
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*/
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#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
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#include <ArduinoModbus.h>
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const int ledPin = LED_BUILTIN;
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void setup() {
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Serial.begin(9600);
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Serial.println("Modbus RTU Server LED");
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// start the Modbus RTU server
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if (!ModbusRTUServer.begin(1, 9600)) {
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Serial.println("Failed to start Modbus RTU Server!");
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while (1);
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}
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// configure the LED
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pinMode(ledPin, OUTPUT);
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digitalWrite(ledPin, LOW);
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// configure a single coil at address 0x00
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ModbusRTUServer.configureCoils(0x00, 1);
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}
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void loop() {
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// poll for Modbus RTU requests
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ModbusRTUServer.poll();
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// read the current value of the coil
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int coilValue = ModbusRTUServer.readCoil(0x00);
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if (coilValue) {
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// coil value set, turn LED on
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digitalWrite(ledPin, HIGH);
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} else {
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// coild value clear, turn LED off
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digitalWrite(ledPin, LOW);
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}
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}

‎examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino

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/*
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WiFi Modbus TCP Client Toggle
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This sketch toggles the coil of a Modbus TCP server connected
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on and off every second.
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Circuit:
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- MKR1000 or MKR WiFi 1010 board
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created 16 July 2018
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by Sandeep Mistry
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*/
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#include <SPI.h>
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#include <WiFiNINA.h> // for MKR WiFi 1010
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// #include <WiFi101.h> // for MKR1000
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#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
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#include <ArduinoModbus.h>
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#include "arduino_secrets.h"
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///////please enter your sensitive data in the Secret tab/arduino_secrets.h
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char ssid[] = SECRET_SSID; // your network SSID (name)
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char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
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int keyIndex = 0; // your network key Index number (needed only for WEP)
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int status = WL_IDLE_STATUS;
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WiFiClient wifiClient;
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ModbusTCPClient modbusTCPClient(wifiClient);
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IPAddress server(192, 168, 1, 10); // update with the IP Address of your Modbus server
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void setup() {
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//Initialize serial and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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Serial.println("Modbus TCP Client Toggle");
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// attempt to connect to Wifi network:
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while (status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
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Serial.println(ssid);
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// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid, pass);
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// wait 10 seconds for connection:
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delay(10000);
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}
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// you're connected now, so print out the status:
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printWifiStatus();
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// start the Modbus RTU client
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if (!modbusTCPClient.begin(server)) {
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Serial.println("Failed to start Modbus TCP Client!");
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while (1);
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}
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}
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void loop() {
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// set value of coil at address 0x00 to 0x01
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if (!modbusTCPClient.writeCoil(0x00, 0x01)) {
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Serial.print("Failed to write coil! ");
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Serial.println(modbusTCPClient.lastError());
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}
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// wait for 1 second
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delay(1000);
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// set value of coil at address 0x00 to 0x00
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if (!modbusTCPClient.writeCoil(0x00, 0x00)) {
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Serial.print("Failed to write coil! ");
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Serial.println(modbusTCPClient.lastError());
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}
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// wait for 1 second
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delay(1000);
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}
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void printWifiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi shield's IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print the received signal strength:
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long rssi = WiFi.RSSI();
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Serial.print("signal strength (RSSI):");
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Serial.print(rssi);
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Serial.println(" dBm");
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}

‎examples/TCP/WiFiModbusClientToggle/arduino_secrets.h

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#define SECRET_SSID ""
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#define SECRET_PASS ""

‎examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino

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/*
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WiFi Modbus TCP Server LED
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This sketch creates a Modbus TCP Server with a simulated coil.
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The value of the simulated coil is set on the LED
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Circuit:
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- MKR1000 or MKR WiFi 1010 board
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created 16 July 2018
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by Sandeep Mistry
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*/
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#include <SPI.h>
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#include <WiFiNINA.h> // for MKR WiFi 1010
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// #include <WiFi101.h> // for MKR1000
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#include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
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#include <ArduinoModbus.h>
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#include "arduino_secrets.h"
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///////please enter your sensitive data in the Secret tab/arduino_secrets.h
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char ssid[] = SECRET_SSID; // your network SSID (name)
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char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
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int keyIndex = 0; // your network key Index number (needed only for WEP)
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const int ledPin = LED_BUILTIN;
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int status = WL_IDLE_STATUS;
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WiFiServer wifiServer(502);
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ModbusTCPServer modbusTCPServer;
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void setup() {
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//Initialize serial and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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Serial.println("Modbus TCP Server LED");
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// attempt to connect to Wifi network:
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while (status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
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Serial.println(ssid);
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// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid, pass);
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// wait 10 seconds for connection:
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delay(10000);
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}
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// you're connected now, so print out the status:
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printWifiStatus();
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// start the server
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wifiServer.begin();
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// start the Modbus TCP client
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if (!modbusTCPServer.begin()) {
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Serial.println("Failed to start Modbus TCP Server!");
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while (1);
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}
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// configure the LED
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pinMode(ledPin, OUTPUT);
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digitalWrite(ledPin, LOW);
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// configure a single coil at address 0x00
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modbusTCPServer.configureCoils(0x00, 1);
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}
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void loop() {
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// listen for incoming clients
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WiFiClient client = wifiServer.available();
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if (client) {
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// a new client connected
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Serial.println("new client");
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// let the Modbus TCP accept the connection
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modbusTCPServer.accept(client);
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while (client.connected()) {
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// poll for Modbus TCP requests, while client connected
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modbusTCPServer.poll();
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// update the LED
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updateLED();
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}
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Serial.println("client disconnected");
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}
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}
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void updateLED() {
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// read the current value of the coil
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int coilValue = ModbusRTUServer.readCoil(0x00);
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if (coilValue) {
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// coil value set, turn LED on
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digitalWrite(ledPin, HIGH);
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} else {
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// coild value clear, turn LED off
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digitalWrite(ledPin, LOW);
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}
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}
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void printWifiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi shield's IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print the received signal strength:
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long rssi = WiFi.RSSI();
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Serial.print("signal strength (RSSI):");
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Serial.print(rssi);
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Serial.println(" dBm");
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}

‎examples/TCP/WiFiModbusServerLED/arduino_secrets.h

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#define SECRET_SSID ""
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#define SECRET_PASS ""

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