com.intelligt.modbus.jlibmodbus.data

Class ModbusFile

java.lang.Object

java.util.Observable

com.intelligt.modbus.jlibmodbus.data.ModbusFile

Direct Known Subclasses:

SimpleModbusFile

public abstract class ModbusFile
extends Observable

quote from MODBUS Application Protocol Specification V1.1b

"A file is an organization of records. Each file contains 10000 records, addressed 0000 to 9999 decimal or 0X0000 to 0X270F. For example, record 12 is addressed as 12. ... The quantity of registers to be read, combined with all other fields in the expected response, must not exceed the allowable length of the MODBUS PDU : 253 bytes."

so the length of file record must not exceed 250 bytes(253 - function_code - resp_data_len - sub_req_resp_len).

Constructor Summary

Constructors

Constructor and Description
ModbusFile(int number)

Method Summary

Modifier and Type	Method and Description
int	getNumber()
abstract int[]	read(int recordNumber, int recordLength) read modbus file record
void	write(int recordNumber, int[] buffer)

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

ModbusFile

public ModbusFile(int number)

Method Detail

read

public abstract int[] read(int recordNumber,
                           int recordLength)
                    throws IllegalDataAddressException

read modbus file record

Parameters:

recordNumber - number of a record

recordLength - read register count

Returns:

record data

Throws:

IllegalDataAddressException - record with number recordNumber not exist or recordLength bytes not allowable.

write

public void write(int recordNumber,
                  int[] buffer)
           throws IllegalDataAddressException,
                  IllegalDataValueException

Throws:

IllegalDataAddressException

IllegalDataValueException

getNumber

public int getNumber()