Name

Type

Description

DataSetFlags1

Byte

Bit 0: DataSetMessage is valid.

If this bit is set to false, the rest of this DataSetMessage is considered invalid, and shall not be processed by the Subscriber.

Bit range 1-2: Field Encoding

00 The DataSet fields are encoded as Variant The Variant can contain a StatusCode instead of the expected DataType if the status of the field is Bad. The Variant can contain a DataValue with the value and the statusCode if the status of the field is Uncertain.

01 RawData Field Encoding

The RawData field encoding is defined in 7.2.4.5.9.

10 DataValue Field Encoding

The DataSet fields are encoded as DataValue. This option is set if the DataSet is configured to send more than the Value.

11 Reserved

Reserved values shall not be used by the sender and the receiver shall skip messages when reserved values are received.

Bit 3: DataSetMessageSequenceNumber enabled

Bit 4: Status enabled

Bit 5: ConfigurationVersionMajorVersion enabled

Bit 6: ConfigurationVersionMinorVersion enabled

Bit 7: DataSetFlags2 enabled

The bit shall be false, if DataSetFlags2 is 0.

DataSetFlags2

Byte

The DataSetFlags2 shall be omitted if bit 7 of the DataSetFlags1 is false.

If the field is omitted, the Subscriber shall handle the related bits as false.

Bit range 0-3: UADP DataSetMessage type

0000Data Key Frame (see 7.2.4.5.5)

If the DataSetFlags2 field is not provided, this is the default DataSetMessage type.

0001Data Delta Frame (see 7.2.4.5.6)

0010Event (see 7.2.4.5.7)

0011Keep Alive (see 7.2.4.5.8)

01xxReserved

1xxxReserved

Reserved values shall not be used by the sender and the receiver shall skip messages when reserved values are received.

Bit 4: Timestamp enabled

Bit 5: PicoSeconds included in the DataSetMessage headerThis bit shall be false if the Timestamp bit is false.

Bit 6: Reserved

Bit 7: Reserved for further extended flag fields

Reserved bits shall be set to false by the Publisher and Subscribers shall skip messages where the reserved bits are not false.

DataSetMessage‌SequenceNumber

UInt16

Sequence number for each new DataSetMessage as defined in 7.2.3.

The field shall be omitted if Bit 3 of DataSetFlags1 is false.

Timestamp

UtcTime

The time the DataSetMessage was created.

The Timestamp shall be omitted if Bit 4 of DataSetFlags2 is false.

PicoSeconds

UInt16

Specifies the number of 10 picoseconds (1,0 e-11 seconds) intervals which shall be added to the Timestamp.

The PicoSeconds field stores the difference between a high-resolution timestamp with a resolution of 10 picoseconds and the Timestamp field value which only has a 100 ns resolution. The PicoSeconds field shall contain values less than 10 000. The decoder shall treat values greater than or equal to 10 000 as the value ‘9.999’.

The field shall be omitted if Bit 5 of DataSetFlags2 is false.

Status

UInt16

The overall status of the DataSetMessage. The dependencies to the status of DataSet fields are defined in Table 26.

This is the high order 16 bits of the StatusCode DataType representing the numeric value of the Severity and SubCode of the StatusCode DataType.

The field shall be omitted if Bit 4 of DataSetFlags1 is false.

ConfigurationVersion

MajorVersion

VersionTime

The major version of the configuration version of the DataSet used as consistency check with the DataSetMetaData available on the Subscriber side.

The field shall be omitted if Bit 5 of DataSetFlags1 is false.

ConfigurationVersion

MinorVersion

VersionTime

The minor version of the configuration version of the DataSet used as consistency check with the DataSetMetaData available on the Subscriber side.

The field shall be omitted if Bit 6 of DataSetFlags1 is false.