What do the pager event codes mean when my system sends a page?

The pager displays a 7-digit status code in the format BBB–CCCC, where BBB is a 3-digit event code and CCCC is the partition and zone or user number. Event code 911 indicates an alarm, 811 indicates a trouble condition, 101 indicates the system was disarmed (open), and 102 indicates the system was armed (close). For example, a display of 911–1004 means an alarm was triggered by a fault on zone 4 in Partition 1. (Page 30)