72 lines
1.9 KiB
Arduino
72 lines
1.9 KiB
Arduino
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/*
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Modbus RTU Server Kitchen Sink
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This sketch creates a Modbus RTU Server and demonstrates
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how to use various Modbus Server APIs.
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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 18 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 numCoils = 10;
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const int numDiscreteInputs = 10;
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const int numHoldingRegisters = 10;
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const int numInputRegisters = 10;
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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 Server Kitchen Sink");
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// start the Modbus RTU server, with (slave) id 42
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if (!ModbusRTUServer.begin(42, 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 coils at address 0x00
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ModbusRTUServer.configureCoils(0x00, numCoils);
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// configure discrete inputs at address 0x00
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ModbusRTUServer.configureDiscreteInputs(0x00, numDiscreteInputs);
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// configure holding registers at address 0x00
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ModbusRTUServer.configureHoldingRegisters(0x00, numHoldingRegisters);
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// configure input registers at address 0x00
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ModbusRTUServer.configureInputRegisters(0x00, numInputRegisters);
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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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// map the coil values to the discrete input values
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for (int i = 0; i < numCoils; i++) {
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int coilValue = ModbusRTUServer.coilRead(i);
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ModbusRTUServer.discreteInputWrite(i, coilValue);
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}
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// map the holding register values to the input register values
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for (int i = 0; i < numHoldingRegisters; i++) {
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long holdingRegisterValue = ModbusRTUServer.holdingRegisterRead(i);
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ModbusRTUServer.inputRegisterWrite(i, holdingRegisterValue);
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}
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}
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