readCoils()

Posted by On 02 / 01 / 2019 0 Comment

Description

Sends a packet command to the Slave node to read the Coils register.

Syntax

node1.readCoils(read_address, read_size)

Parameters

node1: ModbusMasterNode object.

read_address: The starting address of the Coils register to be read.

read_size: The size of the Coils register to be read.

Return

int: If successful, return MODBUS_SUCCESS, otherwise return EXCEPTION_CODE .

Example

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#include <Modbus86.h>

  

ModbusMaster bus1;

ModbusMasterNode node1;

 

uint8_t result;

 

void setup()

{

    while(!Serial);

    Serial1.begin(115200);

    bus1.begin(MODBUS_RTU, Serial1);

    node1.attach(16, bus1);

 

    result = node1.readCoils(5, 2);

     

    if (result != MODBUS_SUCCESS) {

        Serial.print("readCoils => ErrorCode: ");

        Serial.println(result);

    } else {

        Serial.print("From Coil Status receiveData: ");

        Serial.print(node1.getResponseBuffer(0, MODBUS_DATAMODE_BIT));

        Serial.print(", ");

        Serial.println(node1.getResponseBuffer(1, MODBUS_DATAMODE_BIT));

    }

}

  

void loop()

{

}

See Also

－ getResponseBuffer()

Library Reference

The text in the 86Duino reference is modified from the Arduino reference and is licensed under the Creative Commons Attribution-ShareAlike 3.0 License. The code examples in the reference have been released into the public domain.