Omron NT21 - SETUP MANUAL 10-2001 Setup Manual page 163

System Maintenance
Reference:
152
S Install an optional battery in the NT21 when using the alarm history record
function.
S When a battery is not installed or the battery fails, the contents of the history
record will be unpredictable when the NT21 is turned OFF and will be initial-
ized.
S Time stamps will be recorded with the history records using the clock data read
by the NT21 from the host. If the clock data is incorrect, spaces will be stored
instead of the clock data.
S With the NT21, the record data can also be displayed by registering an alarm
history display element on the screen.
S For details on the alarm history record function, refer to 2-15-2 Alarm History
Record Function in the Reference Manual.
S The order of display for sort by occurrence display (from oldest record or from
newest record) is set with the Hist. Disp. Method memory switch (page 139).
Section 6-11