Multi-Tech Systems 7500 - Manual (Page 356)

Event Logging ION 7500 / ION 7600 User’s Guide
Page 356 Time Synchronization & Timekeeping Technical Note
GPS unlocked — generated when the GPS receiver loses its lock on a time
source (Diagnostics module’s GPS Status register goes
OFF ).
Time set event — generated when a time synchronization signal is interpreted as
a time set, and the meter’s clock is reset. Two events are recorded: one with the
timestamp before the clock was set, and one with the timestamp after the clock
was set.