FieldTalk Modbus Slave Library for .NET

MbusDataTableInterfacereadFileRecord Method

Override this method to implement a Data Provider function to read File Records which is Modbus function code 20 (14 hex).

Namespace: FieldTalk.Modbus.Slave
Assembly: FieldTalk.Modbus.Slave (in FieldTalk.Modbus.Slave.dll) Version: 2.10.0-eval+e077c9212ac409edfc97a60819d27e70f6a36e5e

Syntax

C++

Copy

protected virtual bool readFileRecord(
	int refType,
	int fileNo,
	int startRef,
	short[] regArr
)

Protected Overridable Function readFileRecord ( 
	refType As Integer,
	fileNo As Integer,
	startRef As Integer,
	<OutAttribute> regArr As Short()
) As Boolean

protected:
virtual bool readFileRecord(
	int refType, 
	int fileNo, 
	int startRef, 
	[InAttribute] [OutAttribute] array<short>^ regArr
)

Parameters

refType: Type: SystemInt32
Reference type (typically this is 6)
fileNo: Type: SystemInt32
File number (typically 0, 1, 3 or 4)
startRef: Type: SystemInt32
Record Number (equivalent to the start register)
regArr: Type: SystemInt16
Buffer which has to be filled with the reply data (Length: 0 - 125)

Return Value

Type: Boolean
true indicates a successful access and that valid reply data is contained in regArr. The Server Engine will reply the data passed in regArr to the master.

false indicates that access has been denied or is out of range. The Server Engine will reply to the master with an exception reply message

Remarks

When a slave receives a poll request for function code 20 it calls this method to retrieve the data.

Required: No

Default Implementation: Returns false which indicates to Server Engine that this address range is unsupported.

Reference

MbusDataTableInterface Class

FieldTalk.Modbus.Slave Namespace

FieldTalk Modbus Slave Library for .NET
Library version 2.10.0

MbusDataTableInterfaceAddLanguageSpecificTextSet("LST37102F1A_0?cpp=::|nu=.");readFileRecord Method

Parameters

Return Value

Reference

MbusDataTableInterfacereadFileRecord Method