How to interpret the type, data object ID1 , ID2, data value1 and value2 from event buffer of REF615

Is there any document that can explain the meaning of the event buffer of REF 615?
I was able to retrieve the information but was not able to interpret what they stand for.
For example:
12/21/18 13:19:50.413 AC_252_06 TYPE=0 DO1=0 DO2=-28402 DV1=0 DV2=0