Base class which implements Modbus data and control functions. More...

Public Member Functions
	~TMbusMasterFunctions ()
	Destructor. More...

boolean	isOpen ()
	Returns whether the protocol is open or not. More...

	closeProtocol ()
	Closes an open protocol including any associated communication resources (COM ports or sockets).

string	getPackageVersion ()
	Returns the package version number. More...

Bit Access
Table 0:00000 (Coils) and Table 1:00000 (Input Status)
	readCoils (integer slaveAddr, integer startRef, boolean []bitArr)
	Modbus function 1 (01 hex), Read Coil Status/Read Coils. More...

	readInputDiscretes (integer slaveAddr, integer startRef, boolean []bitArr)
	Modbus function 2 (02 hex), Read Inputs Status/Read Input Discretes. More...

	writeCoil (integer slaveAddr, integer bitAddr, boolean bitVal)
	Modbus function 5 (05 hex), Force Single Coil/Write Coil. More...

	forceMultipleCoils (integer slaveAddr, integer startRef, boolean []bitArr)
	Modbus function 15 (0F hex), Force Multiple Coils. More...

16-bit Access
Table 4:00000 (Holding Registers) and Table 3:00000 (Input Registers)
	readMultipleRegisters (integer slaveAddr, integer startRef, word []regArr)
	Modbus function 3 (03 hex), Read Holding Registers/Read Multiple Registers. More...

	readInputRegisters (integer slaveAddr, integer startRef, word []regArr)
	Modbus function 4 (04 hex), Read Input Registers. More...

	writeSingleRegister (integer slaveAddr, integer regAddr, word regVal)
	Modbus function 6 (06 hex), Preset Single Register/Write Single Register. More...

	writeMultipleRegisters (integer slaveAddr, integer startRef, word []regArr)
	Modbus function 16 (10 hex), Preset Multiple Registers/Write Multiple Registers. More...

	maskWriteRegister (integer slaveAddr, integer regAddr, word andMask, word orMask)
	Modbus function 22 (16 hex), Mask Write Register. More...

	readWriteRegisters (integer slaveAddr, integer readRef, word []readArr, integer writeRef, word []writeArr)
	Modbus function 23 (17 hex), Read/Write Registers. More...

32-bit Access
Table 4:00000 (Holding Registers) and Table 3:00000 (Input Registers)
	readMultipleLongInts (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 3 (03 hex) for 32-bit long int data types, Read Holding Registers/Read Multiple Registers as long int data. More...

	readInputLongInts (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 4 (04 hex) for 32-bit long int data types, Read Input Registers as long int data. More...

	writeMultipleLongInts (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 16 (10 hex) for 32-bit long int data types, Preset Multiple Registers/Write Multiple Registers with long int data. More...

	readMultipleFloats (integer slaveAddr, integer startRef, single []float32Arr)
	Modbus function 3 (03 hex) for 32-bit float data types, Read Holding Registers/Read Multiple Registers as float data. More...

	readInputFloats (integer slaveAddr, integer startRef, single []float32Arr)
	Modbus function 4 (04 hex) for 32-bit float data types, Read Input Registers as float data. More...

	writeMultipleFloats (integer slaveAddr, integer startRef, single []float32Arr)
	Modbus function 16 (10 hex) for 32-bit float data types, Preset Multiple Registers/Write Multiple Registers with float data. More...

	readMultipleMod10000 (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 3 (03 hex) for 32-bit modulo-10000 long int data types, Read Holding Registers/Read Multiple Registers as modulo-10000 long int data. More...

	readInputMod10000 (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 4 (04 hex) for 32-bit modulo-10000 long int data types, Read Input Registers as modulo-10000 long int data. More...

	writeMultipleMod10000 (integer slaveAddr, integer startRef, integer []int32Arr)
	Modbus function 16 (10 hex) for 32-bit modulo-10000 long int data types, Preset Multiple Registers/Write Multiple Registers with modulo-10000 long int data. More...

64-bit Access
Table 4:00000 (Holding Registers) and Table 3:00000 (Input Registers)
	readHoldingRegistersI64 (integer slaveAddr, integer startRef, int64 []int64Arr)
	Modbus function 3 for 64-bit integer data, Read Holding Registers as int64_t type. More...

	readInputRegistersI64 (integer slaveAddr, integer startRef, int64 []int64Arr)
	Modbus function 4 for 64-bit integer data, Read Holding Registers as int64_t type. More...

	writeMultipleRegistersI64 (integer slaveAddr, integer startRef, int64 []int64Arr)
	Modbus function 16 (10 Hex) for 64-bit integer data, Write Multiple Registers as int64_t type. More...

	readHoldingRegistersF64 (integer slaveAddr, integer startRef, double []doubleArr)
	Modbus function 3 for 64-bit floating point data, Read Input Registers as double type. More...

	readInputRegistersF64 (integer slaveAddr, integer startRef, double []doubleArr)
	Modbus function 4 for 64-bit floating point data, Read Input Registers as double type. More...

	writeMultipleRegistersF64 (integer slaveAddr, integer startRef, double []doubleArr)
	Modbus function 16 (10 Hex) for 64-bit floating point data, Write Multiple Registers as double type. More...

Diagnostics
	readExceptionStatus (integer slaveAddr, byte &statusByte)
	Modbus function 7 (07 hex), Read Exception Status. More...

	returnQueryData (integer slaveAddr, byte []queryArr, byte []echoArr)
	Modbus function code 8, sub-function 00, Return Query Data. More...

	restartCommunicationsOption (integer slaveAddr, boolean clearEventLog)
	Modbus function code 8, sub-function 01, Restart Communications Option. More...

Custom Function Codes
	customFunction (integer slaveAddr, integer functionCode, byte []requestArr, byte []responseArr, integer &responseLen)
	User Defined Function CodeThis method can be used to implement User Defined Function Codes. More...

Protocol Configuration
integer	timeout
	Time-out port property. More...

integer	pollDelay
	Poll delay property. More...

integer	retryCnt
	Retry count property. More...

	setTimeout (const integer timeOut)
	Configures time-out. More...

integer	getTimeout ()
	Returns the time-out value. More...

	setPollDelay (const integer pollDelay)
	Configures poll delay. More...

integer	getPollDelay ()
	Returns the poll delay time. More...

	setRetryCnt (const integer retryCnt)
	Configures the automatic retry setting. More...

integer	getRetryCnt ()
	Returns the automatic retry count. More...

Transmission Statistic Functions
cardinal	getTotalCounter ()
	Returns how often a message transfer has been executed. More...

	resetTotalCounter ()
	Resets total message transfer counter.

cardinal	getSuccessCounter ()
	Returns how often a message transfer was successful. More...

	resetSuccessCounter ()
	Resets successful message transfer counter.

Slave Configuration
	configureBigEndianInts ()
	Configures int data type functions to do a word swap. More...

	configureSwappedFloats ()
	Configures float data type functions to do a word swap. More...

	configureLittleEndianInts ()
	Configures int data type functions not to do a word swap. More...

	configureIeeeFloats ()
	Configures float data type functions not to do a word swap. More...

	configureStandard32BitMode ()
	Configures all slaves for Standard 32-bit Mode. More...

	configureEnron32BitMode ()
	Configures all slaves for Daniel/ENRON 32-bit Mode. More...

	configureCountFromOne ()
	Configures the reference counting scheme to start with one for all slaves. More...

	configureCountFromZero ()
	Configures the reference counting scheme to start with zero for all slaves. More...

	configureBigEndianInts (integer slaveAddr)
	Enables int data type functions to do a word swap on a per slave basis. More...

	configureLittleEndianInts (integer slaveAddr)
	Disables word swapping for int data type functions on a per slave basis. More...

	configureIeeeFloats (integer slaveAddr)
	Disables float data type functions to do a word swap on a per slave basis. More...

	configureSwappedFloats (integer slaveAddr)
	Enables float data type functions to do a word swap on a per slave basis. More...

	configureStandard32BitMode (integer slaveAddr)
	Configures a slave for Standard 32-bit Register Mode. More...

	configureEnron32BitMode (integer slaveAddr)
	Configures all slaves for Daniel/ENRON 32-bit Mode. More...

	configureCountFromOne (integer slaveAddr)
	Configures a slave's reference counting scheme to start with one. More...

	configureCountFromZero (integer slaveAddr)
	Configures a slave's reference counting scheme to start with zero. More...

Detailed Description

Base class which implements Modbus data and control functions.

The functions provided by this base class apply to all protocol flavours via inheritance. For a more detailed description see section Data and Control Functions for all Modbus Protocol Flavours.

See also: Data and Control Functions for all Modbus Protocol Flavours, Serial Protocols, IP based Protocols

Constructor & Destructor Documentation

◆ ~TMbusMasterFunctions()

~TMbusMasterFunctions ( )

Destructor.

Does clean-up and closes an open protocol including any associated communication resources (serial ports or sockets).

Member Function Documentation

◆ readCoils()

readCoils	(	integer	slaveAddr,
		integer	startRef,
		boolean []	bitArr
	)

Modbus function 1 (01 hex), Read Coil Status/Read Coils.

Reads the contents of the discrete outputs (coils, 0:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
bitArr	Buffer which will contain the data read. The length of the array determines how many coils are read (Range: 1-2000).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputDiscretes()

readInputDiscretes	(	integer	slaveAddr,
		integer	startRef,
		boolean []	bitArr
	)

Modbus function 2 (02 hex), Read Inputs Status/Read Input Discretes.

Reads the contents of the discrete inputs (input status, 1:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
bitArr	Buffer which will contain the data read. The length of the array determines how many inputs are read (Range: 1-2000).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeCoil()

writeCoil	(	integer	slaveAddr,
		integer	bitAddr,
		boolean	bitVal
	)

Modbus function 5 (05 hex), Force Single Coil/Write Coil.

Sets a single discrete output variable (coil, 0:00000 table) to either ON or OFF.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
bitAddr	Coil address (Range: 1 - 65536)
bitVal	true sets, false clears discrete output variable

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ forceMultipleCoils()

forceMultipleCoils	(	integer	slaveAddr,
		integer	startRef,
		boolean []	bitArr
	)

Modbus function 15 (0F hex), Force Multiple Coils.

Writes binary values into a sequence of discrete outputs (coils, 0:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
bitArr	Buffer which contains the data to be sent. The length of the array determines how many coils are written (Range: 1-1968).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readMultipleRegisters()

readMultipleRegisters	(	integer	slaveAddr,
		integer	startRef,
		word []	regArr
	)

Modbus function 3 (03 hex), Read Holding Registers/Read Multiple Registers.

Reads the contents of the output registers (holding registers, 4:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start register (Range: 1 - 65536)
regArr	Buffer which will be filled with the data read. The length of the array determines how many registers are read (Range: 1-125).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputRegisters()

readInputRegisters	(	integer	slaveAddr,
		integer	startRef,
		word []	regArr
	)

Modbus function 4 (04 hex), Read Input Registers.

Read the contents of the input registers (3:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start register (Range: 1 - 65536)
regArr	Buffer which will be filled with the data read. The length of the array determines how many registers are read (Range: 1-125).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeSingleRegister()

writeSingleRegister	(	integer	slaveAddr,
		integer	regAddr,
		word	regVal
	)

Modbus function 6 (06 hex), Preset Single Register/Write Single Register.

Writes a value into a single output register (holding register, 4:00000 reference).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
regAddr	Register address (Range: 1 - 65536)
regVal	Data to be sent

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ writeMultipleRegisters()

writeMultipleRegisters	(	integer	slaveAddr,
		integer	startRef,
		word []	regArr
	)

Modbus function 16 (10 hex), Preset Multiple Registers/Write Multiple Registers.

Writes values into a sequence of output registers (holding registers, 4:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start register (Range: 1 - 65536)
regArr	Buffer with the data to be sent.The length of the array determines how many registers are written (Range: 1-123).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ maskWriteRegister()

maskWriteRegister	(	integer	slaveAddr,
		integer	regAddr,
		word	andMask,
		word	orMask
	)

Modbus function 22 (16 hex), Mask Write Register.

Masks bits according to an AND & an OR mask into a single output register (holding register, 4:00000 reference). Masking is done as follows: result = (currentVal AND andMask) OR (orMask AND (NOT andMask))

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
regAddr	Register address (Range: 1 - 65536)
andMask	Mask to be applied as a logic AND to the register
orMask	Mask to be applied as a logic OR to the register

Note: No broadcast supported

◆ readWriteRegisters()

readWriteRegisters	(	integer	slaveAddr,
		integer	readRef,
		word []	readArr,
		integer	writeRef,
		word []	writeArr
	)

Modbus function 23 (17 hex), Read/Write Registers.

Combines reading and writing of the output registers in one transaction (holding registers, 4:00000 table).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
readRef	Start registers for reading (Range: 1 - 65536)
readArr	Buffer which will contain the data read. The length of the array determines how many registers are read (Range: 1-125).
writeRef	Start registers for writing (Range: 1 - 65536)
writeArr	Buffer with data to be sent. The length of the array determines how many registers are written (Range: 1-121).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readMultipleLongInts()

readMultipleLongInts	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 3 (03 hex) for 32-bit long int data types, Read Holding Registers/Read Multiple Registers as long int data.

Reads the contents of pairs of consecutive output registers (holding registers, 4:00000 table) into 32-bit long int values.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a long int value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputLongInts()

readInputLongInts	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 4 (04 hex) for 32-bit long int data types, Read Input Registers as long int data.

Reads the contents of pairs of consecutive input registers (3:00000 table) into 32-bit long int values.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a long int value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeMultipleLongInts()

writeMultipleLongInts	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 16 (10 hex) for 32-bit long int data types, Preset Multiple Registers/Write Multiple Registers with long int data.

Writes long int values into pairs of output registers (holding registers, 4:00000 table).

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a long int value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer with the data to be sent. The length of the array determines how many values are read (Range: 1-61).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readMultipleFloats()

readMultipleFloats	(	integer	slaveAddr,
		integer	startRef,
		single []	float32Arr
	)

Modbus function 3 (03 hex) for 32-bit float data types, Read Holding Registers/Read Multiple Registers as float data.

Reads the contents of pairs of consecutive output registers (holding registers, 4:00000 table) into float values.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a float value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of float values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
float32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputFloats()

readInputFloats	(	integer	slaveAddr,
		integer	startRef,
		single []	float32Arr
	)

Modbus function 4 (04 hex) for 32-bit float data types, Read Input Registers as float data.

Reads the contents of pairs of consecutive input registers (3:00000 table) into float values.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a float value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of float values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
float32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeMultipleFloats()

writeMultipleFloats	(	integer	slaveAddr,
		integer	startRef,
		single []	float32Arr
	)

Modbus function 16 (10 hex) for 32-bit float data types, Preset Multiple Registers/Write Multiple Registers with float data.

Writes float values into pairs of output registers (holding registers, 4:00000 table).

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a float value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of float values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start reference (Range: 1 - 65536)
float32Arr	Buffer with the data to be sent. The length of the array determines how many values are written (Range: 1-61).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readMultipleMod10000()

readMultipleMod10000	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 3 (03 hex) for 32-bit modulo-10000 long int data types, Read Holding Registers/Read Multiple Registers as modulo-10000 long int data.

Reads the contents of pairs of consecutive output registers (holding registers, 4:00000 table) representing a modulo-10000 long int value into 32-bit int values and performs number format conversion.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a modulo-10000 value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputMod10000()

readInputMod10000	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 4 (04 hex) for 32-bit modulo-10000 long int data types, Read Input Registers as modulo-10000 long int data.

Reads the contents of pairs of consecutive input registers (3:00000 table) representing a modulo-10000 long int value into 32-bit long int values and performs number format conversion.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because an modulo-10000 value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-62).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeMultipleMod10000()

writeMultipleMod10000	(	integer	slaveAddr,
		integer	startRef,
		integer []	int32Arr
	)

Modbus function 16 (10 hex) for 32-bit modulo-10000 long int data types, Preset Multiple Registers/Write Multiple Registers with modulo-10000 long int data.

Writes long int values into pairs of output registers (holding registers, 4:00000 table) representing a modulo-10000 long int value and performs number format conversion.

Remarks: Modbus does not know about any other data type than discretes and 16-bit registers. Because a modulo-10000 value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of int values passed to this function.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start reference (Range: 1 - 65536)
int32Arr	Buffer with the data to be sent. The length of the array determines how many values are written (Range: 1-61).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readHoldingRegistersI64()

readHoldingRegistersI64	(	integer	slaveAddr,
		integer	startRef,
		int64 []	int64Arr
	)

Modbus function 3 for 64-bit integer data, Read Holding Registers as int64_t type.

Reads the contents of quartets of consecutive holding registers (4:00000 table) into 64-bit integer values.

Remarks: Depending on the 32-bit Mode setting, an int64_t will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int64Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-31).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputRegistersI64()

readInputRegistersI64	(	integer	slaveAddr,
		integer	startRef,
		int64 []	int64Arr
	)

Modbus function 4 for 64-bit integer data, Read Holding Registers as int64_t type.

Reads the contents of quartets of consecutive input registers (3:00000 table) into 64-bit integer values.

Remarks: Depending on the 32-bit Mode setting, an int64_t will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
int64Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-31).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeMultipleRegistersI64()

writeMultipleRegistersI64	(	integer	slaveAddr,
		integer	startRef,
		int64 []	int64Arr
	)

Modbus function 16 (10 Hex) for 64-bit integer data, Write Multiple Registers as int64_t type.

Writes for 64-bit integer values into quartets of holding registers (4:00000 table).

Remarks: Depending on the 32-bit Mode setting, an int will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start reference (Range: 1 - 65536)
int64Arr	Buffer with the data to be sent. The length of the array determines how many values are read (Range: 1-30).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readHoldingRegistersF64()

readHoldingRegistersF64	(	integer	slaveAddr,
		integer	startRef,
		double []	doubleArr
	)

Modbus function 3 for 64-bit floating point data, Read Input Registers as double type.

Reads the contents of quartets of consecutive input registers (4:00000 table) into 64-bit floating point values.

Remarks: Depending on the 32-bit Mode setting, a double will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
double64Arr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-31).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ readInputRegistersF64()

readInputRegistersF64	(	integer	slaveAddr,
		integer	startRef,
		double []	doubleArr
	)

Modbus function 4 for 64-bit floating point data, Read Input Registers as double type.

Reads the contents of quartets of consecutive input registers (3:00000 table) into 64-bit floating point values.

Remarks: Depending on the 32-bit Mode setting, a double will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef	Start reference (Range: 1 - 65536)
doubleArr	Buffer which will be filled with the data read. The length of the array determines how many values are read (Range: 1-31).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ writeMultipleRegistersF64()

writeMultipleRegistersF64	(	integer	slaveAddr,
		integer	startRef,
		double []	doubleArr
	)

Modbus function 16 (10 Hex) for 64-bit floating point data, Write Multiple Registers as double type.

Writes for 64-bit floating point values into quartets of holding registers (4:00000 table).

Remarks: Depending on the 32-bit Mode setting, a double will be transferred as four consecutive 16-bit registers (Standard) or as two 32-bit registers (Daniel/Enron).

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 0 - 255)
startRef	Start reference (Range: 1 - 65536)
double64Arr	Buffer with the data to be sent. The length of the array determines how many values are written (Range: 1-30).

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: Broadcast supported for serial protocols

◆ readExceptionStatus()

readExceptionStatus	(	integer	slaveAddr,
		byte &	statusByte
	)

Modbus function 7 (07 hex), Read Exception Status.

Reads the eight exception status coils within the slave device.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
statusByte	Slave status byte. The meaning of this status byte is slave specific and varies from device to device.

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ returnQueryData()

returnQueryData	(	integer	slaveAddr,
		byte []	queryArr,
		byte []	echoArr
	)

Modbus function code 8, sub-function 00, Return Query Data.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
queryArr	Data to be sent
echoArr	Buffer which will contain the data read. Array must be of the same size as queryArr.

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ restartCommunicationsOption()

restartCommunicationsOption	(	integer	slaveAddr,
		boolean	clearEventLog
	)

Modbus function code 8, sub-function 01, Restart Communications Option.

Parameters

slaveAddr	Modbus address of slave device or unit identifier (Range: 1 - 255)
clearEventLog	Flag when set to one clears in addition the slave's communication even log.

Exceptions

EIllegalStateError	Port or connection is closed
EInOutError	An I/O error occurred
EIllegalArgumentError	A parameter is out of range
EBusProtocolException	A protocol failure occurred. See descendants of EBusProtocolException for a more detailed failure list.

Note: No broadcast supported

◆ setTimeout()

setTimeout ( const integer timeOut )

Configures time-out.

This function sets the operation or socket time-out to the specified value.

Remarks: The time-out value is indicative only and not guaranteed to be maintained. How precise it is followed depends on the operating system used, it's scheduling priority and it's system timer resolution.

Note: A protocol must be closed in order to configure it.

Parameters

timeOut Timeout value in ms (Range: 1 - 100000)

Exceptions

EIllegalStateError	Protocol is already open
EIllegalArgumentError	A parameter is out of range

◆ getTimeout()

integer getTimeout ( )

Returns the time-out value.

Remarks: The time-out value is indicative only and not guaranteed to be maintained. How precise it is followed depends on the operating system used, it's scheduling priority and it's system timer resolution.

Returns: Timeout value in ms

◆ setPollDelay()

setPollDelay ( const integer pollDelay )

Configures poll delay.

This function sets the delay time which applies between two consecutive Modbus read/write. A value of 0 disables the poll delay.

Remarks: The delay value is indicative only and not guaranteed to be maintained. How precise it is followed depends on the operating system used, it's scheduling priority and it's system timer resolution.

Note: A protocol must be closed in order to configure it.

Parameters

pollDelay Delay time in ms (Range: 0 - 100000), 0 disables poll delay

Exceptions

EIllegalStateError	Protocol is already open
EIllegalArgumentError	A parameter is out of range

◆ getPollDelay()

integer getPollDelay ( )

Returns the poll delay time.

Returns: Delay time in ms, 0 if poll delay is switched off

◆ setRetryCnt()

setRetryCnt ( const integer retryCnt )

Configures the automatic retry setting.

A value of 0 disables any automatic retries.

Note: A protocol must be closed in order to configure it.

Parameters

retryCnt Retry count (Range: 0 - 10), 0 disables retries

Exceptions

EIllegalStateError	Protocol is already open
EIllegalArgumentError	A parameter is out of range

◆ getRetryCnt()

integer getRetryCnt ( )

Returns the automatic retry count.

Returns: Retry count

◆ getTotalCounter()

cardinal getTotalCounter ( )

Returns how often a message transfer has been executed.

Returns: Counter value

◆ getSuccessCounter()

cardinal getSuccessCounter ( )

Returns how often a message transfer was successful.

Returns: Counter value

◆ configureBigEndianInts() [1/2]

configureBigEndianInts ( )

Configures int data type functions to do a word swap.

Modbus is using little-endian word order for 32-bit values. The data transfer functions operating upon 32-bit int data types can be configured to do a word swap which enables them to read 32-bit data correctly from a big-endian machine.

◆ configureSwappedFloats() [1/2]

configureSwappedFloats ( )

Configures float data type functions to do a word swap.

The data functions operating upon 32-bit float data types can be configured to do a word swap.

Note: Most platforms store floats in IEEE 754 little-endian order which does not need a word swap.

◆ configureLittleEndianInts() [1/2]

configureLittleEndianInts ( )

Configures int data type functions not to do a word swap.

This is the default.

◆ configureIeeeFloats() [1/2]

configureIeeeFloats ( )

Configures float data type functions not to do a word swap.

This is the default.

◆ configureStandard32BitMode() [1/2]

configureStandard32BitMode ( )

Configures all slaves for Standard 32-bit Mode.

In Standard 32-bit Register Mode a 32-bit value is transmitted as two consecutive 16-bit Modbus registers.

Remarks: This is the default mode

◆ configureEnron32BitMode() [1/2]

configureEnron32BitMode ( )

Configures all slaves for Daniel/ENRON 32-bit Mode.

Some Modbus flavours like the Daniel/Enron protocol represent a 32-bit value using one 32-bit Modbus register instead of two 16-bit registers.

◆ configureCountFromOne() [1/2]

configureCountFromOne ( )

Configures the reference counting scheme to start with one for all slaves.

This renders the reference range to be 1 to 65536 and register #0 is an illegal register.

Remarks: This is the default mode

◆ configureCountFromZero() [1/2]

configureCountFromZero ( )

Configures the reference counting scheme to start with zero for all slaves.

This renders the valid reference range to be 0 to 65535.

This renders the first register to be #0 for all slaves.

◆ configureBigEndianInts() [2/2]

configureBigEndianInts ( integer slaveAddr )

Enables int data type functions to do a word swap on a per slave basis.

Modbus is using little-endian word order for 32-bit values. The data transfer functions operating upon 32-bit int data types can be configured to do a word swap which enables them to read 32-bit data correctly from a big-endian machine.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureLittleEndianInts() [2/2]

configureLittleEndianInts ( integer slaveAddr )

Disables word swapping for int data type functions on a per slave basis.

Modbus is using little-endian word order for 32-bit values. This setting assumes that the slave also serves 32-bit data in little little-endian word order.

Remarks: This is the default mode

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureIeeeFloats() [2/2]

configureIeeeFloats ( integer slaveAddr )

Disables float data type functions to do a word swap on a per slave basis.

Modbus is using little-endian word order for 32-bit values. This setting assumes that the slave also serves 32-bit floats in little little-endian word order which is the most common case.

Remarks: This is the default mode

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureSwappedFloats() [2/2]

configureSwappedFloats ( integer slaveAddr )

Enables float data type functions to do a word swap on a per slave basis.

The data functions operating upon 32-bit float data types can be configured to do a word swap.

Note: Most platforms store floats in IEEE 754 little-endian order which does not need a word swap.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureStandard32BitMode() [2/2]

configureStandard32BitMode ( integer slaveAddr )

Configures a slave for Standard 32-bit Register Mode.

In Standard 32-bit Register Mode a 32-bit value is transmitted as two consecutive 16-bit Modbus registers.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureEnron32BitMode() [2/2]

configureEnron32BitMode ( integer slaveAddr )

Configures all slaves for Daniel/ENRON 32-bit Mode.

Some Modbus flavours like the Daniel/Enron protocol represent a 32-bit value using one 32-bit Modbus register instead of two 16-bit registers.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureCountFromOne() [2/2]

configureCountFromOne ( integer slaveAddr )

Configures a slave's reference counting scheme to start with one.

This renders the reference range to be 1 to 65536 and register #0 is an illegal register.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Remarks: This is the default mode

Exceptions

EIllegalArgumentError A parameter is out of range

◆ configureCountFromZero() [2/2]

configureCountFromZero ( integer slaveAddr )

Configures a slave's reference counting scheme to start with zero.

This is also known as PDU addressing.

This renders the valid reference range to be 0 to 65535.

Parameters

slaveAddr Modbus address of slave device or unit identifier (Range: 1 - 255). A value of zero configures the behaviour for broadcasting.

Exceptions

EIllegalArgumentError A parameter is out of range

◆ isOpen()

boolean isOpen ( )

Returns whether the protocol is open or not.

Return values

true	= open
false	= closed

◆ getPackageVersion()

class string getPackageVersion ( )

Returns the package version number.

Returns: Package version string

Member Data Documentation

◆ timeout

integer timeout

Time-out port property.

Note: A protocol must be closed in order to configure it.

See also: getTimeout For reading; setTimeout For writing

◆ pollDelay

integer pollDelay

Poll delay property.

Delay between two Modbus read/writes in ms

Note: A protocol must be closed in order to configure it.

See also: getPollDelay For reading; setPollDelay For writing

◆ retryCnt

integer retryCnt

Retry count property.

Note: A protocol must be closed in order to configure it.

See also: getRetryCnt For reading; setRetryCnt For writing

Public Member Functions

Bit Access

16-bit Access

32-bit Access

64-bit Access

Diagnostics

Custom Function Codes

Protocol Configuration

Transmission Statistic Functions

Slave Configuration

Detailed Description

Constructor & Destructor Documentation

◆ ~TMbusMasterFunctions()

Member Function Documentation

◆ readCoils()

◆ readInputDiscretes()

◆ writeCoil()

◆ forceMultipleCoils()

◆ readMultipleRegisters()

◆ readInputRegisters()

◆ writeSingleRegister()

◆ writeMultipleRegisters()

◆ maskWriteRegister()

◆ readWriteRegisters()

◆ readMultipleLongInts()

◆ readInputLongInts()

◆ writeMultipleLongInts()

◆ readMultipleFloats()

◆ readInputFloats()

◆ writeMultipleFloats()

◆ readMultipleMod10000()

◆ readInputMod10000()

◆ writeMultipleMod10000()

◆ readHoldingRegistersI64()

◆ readInputRegistersI64()

◆ writeMultipleRegistersI64()

◆ readHoldingRegistersF64()

◆ readInputRegistersF64()

◆ writeMultipleRegistersF64()

◆ readExceptionStatus()

◆ returnQueryData()

◆ restartCommunicationsOption()

◆ setTimeout()

◆ getTimeout()

◆ setPollDelay()

◆ getPollDelay()

◆ setRetryCnt()

◆ getRetryCnt()

◆ getTotalCounter()

◆ getSuccessCounter()

◆ configureBigEndianInts() [1/2]

◆ configureSwappedFloats() [1/2]

◆ configureLittleEndianInts() [1/2]

◆ configureIeeeFloats() [1/2]

◆ configureStandard32BitMode() [1/2]

◆ configureEnron32BitMode() [1/2]

◆ configureCountFromOne() [1/2]

◆ configureCountFromZero() [1/2]

◆ configureBigEndianInts() [2/2]

◆ configureLittleEndianInts() [2/2]

◆ configureIeeeFloats() [2/2]

◆ configureSwappedFloats() [2/2]

◆ configureStandard32BitMode() [2/2]

◆ configureEnron32BitMode() [2/2]

◆ configureCountFromOne() [2/2]

◆ configureCountFromZero() [2/2]

◆ isOpen()

◆ getPackageVersion()

Member Data Documentation

◆ timeout

◆ pollDelay

◆ retryCnt