FieldTalk Modbus Slave Library for .NET

MbusDataTableInterfacereadInputRegistersTable Method

Override this method to implement a Data Provider function to read Input Registers.

Namespace: FieldTalk.Modbus.Slave
Assembly: FieldTalk.Modbus.Slave (in FieldTalk.Modbus.Slave.dll) Version: 2.11.0-eval+eb1ecbe71c969eff5d7c05d58da16dade0474678

Syntax

C++

Copy

protected virtual bool readInputRegistersTable(
	int startRef,
	short[] regArr
)

Protected Overridable Function readInputRegistersTable ( 
	startRef As Integer,
	<OutAttribute> regArr As Short()
) As Boolean

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

Parameters

startRef: Type: SystemInt32
Start register (Range: 1 - 65536)
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 the 3:00000 data table it calls this method to retrieve the data.

Required: Yes

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

Examples

A simple and very common implementation is to map the Input Registers to the same address space than the Holding Registers table:

C++

Copy

protected override int readInputRegistersTable(int startRef, short[] regArr)
{
   return readHoldingRegistersTable(startRef, regArr);
}

Protected Overrides Function readInputRegistersTable(ByVal startRef As Integer, ByVal regArr() As Short) As Integer
    Return readHoldingRegistersTable(startRef, regArr)
End Function

Reference

MbusDataTableInterface Class

FieldTalk.Modbus.Slave Namespace

FieldTalk Modbus Slave Library for .NET
Library version 2.11.0

MbusDataTableInterfaceAddLanguageSpecificTextSet("LSTBEC35A07_0?cpp=::|nu=.");readInputRegistersTable Method

Parameters

Return Value

Reference

MbusDataTableInterfacereadInputRegistersTable Method