Dnp3 - Variation And Qualifier Codes - Applied Systems Engineering ASE2000 User Manual

When a request is received, the ASE2000 matches it against the closest defined exchange. A
request for a single object only should match one of the default exchanges. A read for multiple
objects will match a user configured exchange for the same objects, if one exists. If such an
exchange is not configured, it will match a single object read for the last object in the list. For
example, a read for static analog and digital data (in that order) will match an exchange configured
with those two objects in the correct order. If such an exchange does not exist, it will match an
exchange with only digital data.
The importance of matching a correct exchange is to:
• Identify the exchange in the line monitoring and messages views. The name is selected from
the exchange matched
• In RTU Simulation mode, transmit the correct response. The response is generated from user
entries made in the matched exchange
To create a multiple object exchange:
• Highlight a similar existing exchange, such as Analog input
• Make a copy by highlighting that exchange and selecting Edit/Copy and Edit/Paste. You now
have two identical exchanges with the same name
• Highlight one of them and select Edit/Edit Exchange Properties. This generates the Exchange
Properties menu (discussed previously). A portion of the menu for an analog read exchange is:
In the case discussed, you want to modify this exchange to include both analog and binary input
points.
• Select the line underneath 30: Analog and, using the pull-down lists, create an entry for the
Binary object
• Notice a third line is created, allowing entry of more objects as required
• When finished, change the exchange name from Analog Input to something more meaningful
The modified exchange will now match a read message requesting both analog and binary input
data.
26.1.4. DNP3 – Variation and Qualifier Codes
The variation and qualifier code fields modify message transmission for Master and RTU
Simulation modes. They are not used to identify an incoming message.
Variations
Object group variations can be changed from a pull-down generated by clicking in the
Variation column for the correct object row. The variation pull-down list presents options for the
corresponding object group.
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