56 lines
1.3 KiB
Arduino
56 lines
1.3 KiB
Arduino
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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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}
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void loop() {
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// for (slave) id 1: write the value of 0x01, to the coil at address 0x00
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if (!ModbusRTUClient.coilWrite(1, 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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// for (slave) id 1: write the value of 0x00, to the coil at address 0x00
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if (!ModbusRTUClient.coilWrite(1, 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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}
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