org.avineas.modbus

Class ReadHoldingRegistersRequest

java.lang.Object

org.avineas.modbus.ModbusPacket

org.avineas.modbus.ModbusRequest

org.avineas.modbus.ReadHoldingRegistersRequest

public class ReadHoldingRegistersRequest
extends ModbusRequest

Read multiple registers, request part. A read multiple registers request contains the start address and the number of registers to read. As such this is a wrapper for this information.

Field Summary

Fields

Modifier and Type	Field and Description
static int	FUNCTION

Constructor Summary

Constructors

Constructor and Description
ReadHoldingRegistersRequest(int startAddress, int numRegisters) Construct a read request.
ReadHoldingRegistersRequest(ModbusRequest request) Construct a read request from a received request in slave mode.

Method Summary

Methods

Modifier and Type	Method and Description
int	getNumberOfRegisters() Get the number of registers as present/requested by this request.
int	getStartAddress() Get the start address as present in this request.

Methods inherited from class org.avineas.modbus.ModbusPacket

decode, encode, getFunction, toBytes

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FUNCTION

public static final int FUNCTION

See Also:

Constant Field Values

Constructor Detail

ReadHoldingRegistersRequest

public ReadHoldingRegistersRequest(int startAddress,
                           int numRegisters)

Construct a read request.

Parameters:

startAddress - The start address where to read

numRegisters - The number of registers to read

ReadHoldingRegistersRequest

public ReadHoldingRegistersRequest(ModbusRequest request)
                            throws java.lang.IllegalArgumentException

Construct a read request from a received request in slave mode. This constructor is normally used if the request is checked against the function code of a read request and therefore is actually such a request.

Parameters:

request - The received request

Throws:

java.lang.IllegalArgumentException - In case request isn't a read request

Method Detail

getStartAddress

public int getStartAddress()

Get the start address as present in this request.

Returns:

The start address

getNumberOfRegisters

public int getNumberOfRegisters()

Get the number of registers as present/requested by this request.

Returns:

The number of registers