beginTransmission()

Posted by On 02 / 01 / 2019 0 Comment

Description

Set the starting address of the Slave device register to be written. Used with writeMultipleCoils or writeMultipleRegisters without parameters. See Example for details.

Syntax

node1.beginTransmission(write_address)

Parameters

node1: ModbusMasterNode object.

write_address: The starting address of the Slave device register to be written.

Example

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

#include <Arduino.h>

#include <Modbus86.h>

 

ModbusMaster bus1;

ModbusMasterNode node2;

 

uint8_t reg[2];

uint8_t result;

 

void setup()

{

    while(!Serial);

    Serial1.begin(115200);

    bus1.begin(MODBUS_RTU, Serial1);

    node2.attach(16, bus1);

 

    reg[0] = 0x1234;

    reg[1] = 0xabcd;

    node2.beginTransmission(5);

    node2.send(reg[0]);

    node2.send(reg[1]);

    result = node2.writeMultipleRegisters();

 

    if (result != MODBUS_SUCCESS) {

        Serial.print("ErrorCode: ");

        Serial.println(result);

    }

}

 

void loop()

{

}

See Also

writeMultipleCoils()
writeMultipleRegisters()
sendBit()
send()

Library Reference

The text of the 86Duino reference material is licensed under the Creative Commons Attribution-Share Alike 3.0 License. The code examples in Resources have been released into the public domain.