ReadISDU – OPC UA for IO-Link Devices and IO-Link Masters

The Method ReadISDU reads parameters from the device using the ISDU mechanism.

Signature

	ReadISDU (
		[in]	UInt16		Index,
		[in]	Byte			SubIndex,
		[out]	Byte[]		Result,
		[out]	UInt16		ErrorType,
		[out]	Int32			Status
		);

Argument	Description
Index	Index, 8-bit index and 16-bit index are both mapped to UInt16
SubIndex	SubIndex, set to 0 if not used
Result	Hex Values returned as data in case of a successful operation. Data needs to be interpreted according to the IO-Link Specification. Empty array if operation was not successful.
ErrorType	Hex Values converted to UInt16 returned as ErrorType in case the operation was not successful. Data needs to be interpreted according to the IO-Link Specification. 0 if the operation was successful.
Status	Returns the status of the operation. 0: OK, operation successful -1: Operation already running, either by same or different ISDU read or write -2: Device not active, either device not connected, not in operation mode or port is configured not to be in IO-Link mode -3: Operation executed but error code returned from device, details are provided in ErrorType