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DNP3 - filtering and displaying a specific point number?

asked 2021-06-09 20:31:57 +0000

cealt gravatar image

updated 2021-06-11 07:42:04 +0000

grahamb gravatar image

I need to track the date time and value of a specific Analog Input. it's not clear from the DNP3 display filter how to do that. Can someone either point to or provide an assist?

thanks in advance

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Will you be using tshark or Wireshark? What is the goal for "need to track" ?

Chuckc gravatar imageChuckc ( 2021-06-10 14:39:47 +0000 )edit

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answered 2021-06-10 07:47:20 +0000

grahamb gravatar image

updated 2021-06-11 07:37:38 +0000

If you look at one of the responses with your analog data and expand the packet details pane and then expand the data for any point and select the "Index" element, you'll see in the bottom status bar at the left the name of the filed "Object Index" and in parenthesis the filter name "dnp3.al.index".

Using this you can filter on ANY object in a response with dnp3.al.index == 123 supplying the index number as appropriate.

Unfortunately this will display packets with ANY object type with that index, so you might have to qualify the filter by adding a clause that also requires a specific analog object type, e.g.

dnp3.al.index == 123 && (dnp3.al.ana.int || dnp3.al.ana.float || dnp3.al.ana.double)

which adds the qualifiers of the analog type; int for both 16 bit and 32 bit, float and double. Note that this will also display packets that contain both an analog input and any point with the specified index which still might not be what you require.

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Thank you.

cealt gravatar imagecealt ( 2021-06-11 16:07:18 +0000 )edit

Also see a new issue I've raised - DNP3 point index filters are not object type specific that if implemented would make filtering for a specific object index a little simpler.

grahamb gravatar imagegrahamb ( 2021-06-11 16:19:12 +0000 )edit

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Asked: 2021-06-09 20:31:57 +0000

Seen: 98 times

Last updated: Jun 11