FieldTalk Modbus Slave Library for .NET

MbusDataTableInterfacereadInputDiscretesTable Method

Override this method to implement a Data Provider function to read Coils.

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 readInputDiscretesTable(
	int startRef,
	bool[] bitArr
)

Protected Overridable Function readInputDiscretesTable ( 
	startRef As Integer,
	<OutAttribute> bitArr As Boolean()
) As Boolean

protected:
virtual bool readInputDiscretesTable(
	int startRef, 
	[InAttribute] [OutAttribute] array<bool>^ bitArr
)

Parameters

startRef: Type: SystemInt32
Start register (Range: 1 - 65536)
bitArr: Type: SystemBoolean
Buffer which has to be filled with the reply data (Length: 0 - 2000). Each char repesents one discrete!

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 0:00000 data table 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.

Examples

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

C++

Copy

protected override int readInputDiscretesTable(int startRef, bool[] bitArr)
{
   return readCoilsTable(startRef, bitArr);
}

Protected Overrides Function readInputDiscretesTable(ByVal startRef As Integer, ByVal bitArr() As Boolean) As Integer
    Return readCoilsTable(startRef, bitArr)
End Function

Reference

MbusDataTableInterface Class

FieldTalk.Modbus.Slave Namespace

FieldTalk Modbus Slave Library for .NET
Library version 2.11.0

MbusDataTableInterfaceAddLanguageSpecificTextSet("LST5AAB289_0?cpp=::|nu=.");readInputDiscretesTable Method

Parameters

Return Value

Reference

MbusDataTableInterfacereadInputDiscretesTable Method