[Modbus]
Description
Write to the Input Registers.
Syntax
node1.writeInputRegister(address, value)
node2.writeInputRegister(address, size, buffer)
Parameters
node1/node2: ModbusSlaveNode object.address: The address of the Input Registers to write to.value: The value of the single Input Registers that you want to write to.size: The number of plural Input Registers you want to write to.buffer: Copy the data of the array in the array space pointed to by the buffer to the Input Registers.
Returns
int: If it succeeds, send back MODBUS_SUCCESS, and vice versa send back EXCEPTION_CODE.
Example
#include <Modbus86.h>
ModbusSlave bus;
ModbusSlaveNode node;
uint8_t read_input_registers( uint8_t function,
uint16_t address,
uint16_t length)
{
int sensorPin = A2;
if (address <= 2 && address + length > 2)
node.writeInputRegister(2, analogRead(sensorPin));
return MODBUS_SUCCESS;
}
void setup()
{
Serial485.begin(115200);
/* Modbus RTU Mode via RS485. */
bus.begin(MODBUS_RTU, Serial485);
/* Slave node with ID 11. */
node.attach(11, bus);
/* Set the callback function of Read Input Registers (0x04). */
node.cbFunc[MODBUS_CB_READ_INPUT_REGISTERS]
= read_input_registers;
}
void loop()
{
node.poll();
}Libraries Reference Home
The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.
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