62 lines
1.4 KiB
Arduino
62 lines
1.4 KiB
Arduino
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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, with (slave) id 1
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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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int packetReceived = ModbusRTUServer.poll();
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if(packetReceived) {
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// read the current value of the coil
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int coilValue = ModbusRTUServer.coilRead(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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// coil value clear, turn LED off
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digitalWrite(ledPin, LOW);
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}
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}
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}
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