Supported features

The adapter supports specific DNP3 point types.

Supported DNP point types

You can configure AVEVA Adapter for DNP3 to read data from each of the following point types as defined in the DNP3 specification. The conformance level defined for a request of each of these points is also listed. Responses can be considered a different conformance level. For more details, refer to the DNP3 specification.

Note: Do not configure the adapter to request data for point types that are unsupported by your outstation.

1Although the Octet String point type is supported by the adapter, if the value returned by the outstation contains any null characters (for example, ASCII 0x00), the string is truncated at the first null character.

Variation zero has a special meaning in DNP3. You can configure the adapter to request a variation zero for static scans and the outstation should return data in a variation that it prefers. The outstation is not allowed to specify variation zero in its response. The adapter will not request a specific variation for event data, but it is able to parse any of the variations listed above.

Note: This adapter no longer supports Group 50 Variation 4 messages (Time and Data - Indexed Absolute Time and Long Interval).

Data Quality - Object Flags

Many of the supported object variations include object flags. AVEVA Adapter for DNP3 interprets these object flags as Data Quality and sends them as a 1-byte integer for the Quality property on the stream.

Each bit in the object flag indicates a separate condition. The following table describes the flags for the supported types. For more information about object flags, refer to the DNP3 Protocol Specification.