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Selector number of a paquet's data

I am using Lonscanner to capture the packets on a Lonworks network and i'm trying to analyse the data.
If we take the example in section 4. Example Packet Logs (page 55)
we have Data: NVI_848 = 51201
which means that the network variable is an input network variable with selector number 848.
How can i know the signification of the selector number in the paquets and how did they assume that it is an SNVT_switch in the example?

Thank you.

Nasser Ghedamsi

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