Documentation

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: 2.11.0-eval+eb1ecbe71c969eff5d7c05d58da16dade0474678
Syntax
Copy
protected virtual bool readFileRecord(
	int refType,
	int fileNo,
	int startRef,
	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.

See Also