5.2.2.17 DataValue
A DataValue is always preceded by a mask that indicates which fields are present in the stream.
The fields of a DataValue are described in Table 27.
| Name | Data Type | Description |
|---|---|---|
| Encoding Mask | Byte | A bit mask that indicates which fields are present in the stream. The mask has the following bits: |
| Value | Variant | The value. Not present if the Value bit in the EncodingMask is False. |
| Status | StatusCode | The status associated with the value. Not present if the StatusCode bit in the EncodingMask is False. |
| SourceTimestamp | DateTime | The source timestamp associated with the value. Not present if the SourceTimestamp bit in the EncodingMask is False. |
| SourcePicoseconds | UInt16 | The number of 10 Picosecond intervals for the SourceTimestamp. Not present if the SourcePicoseconds bit in the EncodingMask is False. If the source timestamp is missing the Picoseconds are ignored. |
| ServerTimestamp | DateTime | The Server timestamp associated with the value. Not present if the ServerTimestamp bit in the EncodingMask is False. |
| ServerPicoseconds | UInt16 | The number of 10 Picosecond intervals for the ServerTimestamp. Not present if the ServerPicoseconds bit in the EncodingMask is False. If the Server timestamp is missing the Picoseconds are ignored. |
The Picoseconds fields store 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 fields shall contain values less than 10 000. The decoder shall treat values greater than or equal to 10 000 as the value ‘9999’.