[Modbus]
Description
Send a packet command to the Slave node to read and write the Holding Registers.
Syntax
node1.readWriteMultipleRegisters(read_address, read_size, write_address, write_size)
node2.readWriteMultipleRegisters(read_address, read_size)
(See the examples to illustrate the different functions and usage of the parameters)
Parameters
node1/node2: ModbusMasterNode Object.read_address: The starting address of the Holding Registers to be read.read_size: The size of the Holding Registers to be read.write_address: The starting address of the Holding Registers you want to write to.write_size: The size of the Holding Registers that you want to write to.
Returns
Int: If it succeeds, send back MODBUS_SUCCESS and vice versa, send back EXCEPTION_CODE.
Example
#include <Arduino.h>
#include <Modbus86.h>
ModbusMaster bus1;
ModbusMasterNode node1;
uint8_t reg[2];
uint8_t result;
uint32_t receiveData;
void setup()
{
while(!Serial);
Serial1.begin(115200);
bus1.begin(MODBUS_RTU, Serial1);
node1.attach(16, bus1);
reg[0] = 0x1234;
reg[1] = 0xabcd;
node1.setTransmitBuffer(0, reg[0], MODBUS_DATAMODE_UINT16);
node1.setTransmitBuffer(1, reg[1], MODBUS_DATAMODE_UINT16);
result = node1.readWriteMultipleRegisters(5, 2, 10, 2);
if (result != MODBUS_SUCCESS) {
Serial.print("readWriteMultipleRegisters => ErrorCode: ");
Serial.println(result);
} else {
Serial.print("From Holding Register receiveData: ");
receiveData = node1.getResponseBuffer(0)
| (node1.getResponseBuffer(1) << 16);
Serial.println(receiveData);
}
}
void loop()
{
}#include <Arduino.h>
#include <Modbus86.h>
ModbusMaster bus1;
ModbusMasterNode node2;
uint8_t reg[2];
uint8_t result;
uint32_t receiveData;
void setup()
{
while(!Serial);
bus1.begin(MODBUS_RTU,Serial1);
node2.attach(16, bus1);
reg[0] = 0x1234;
reg[1] = 0xabcd;
node2.beginTransmission(10);
node2.send(reg[0]);
node2.send(reg[1]);
result = node2.readWriteMultipleRegisters(5, 2);
if (result != MODBUS_SUCCESS) {
Serial.print("readWriteMultipleRegisters => ErrorCode: ");
Serial.println(result);
} else {
Serial.print("From Holding Register receiveData: ");
receiveData = node2.getResponseBuffer(0)
| (node2.getResponseBuffer(1) << 16);
Serial.println(receiveData);
}
}
void loop()
{
}
See Also
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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