I am getting the following output from camonitor for BUSY DATA and EXSC field of sscan record. I see in camonitor the timestamp for the sscan BUSY field is same for busy state and not busy.
The timestamp of an EPICS record is defined as the time when the record was processed for the last time. If a record is sending multiple monitor updates on the same field during a single processing, their timestamps will be the same.
If you rather want the timestamps of each update to be the time when that particular update was sent, have a look at the "ts" (timestamp) filter in EPICS Base.
Cheers,
~Ralph