7K • Chapter 8
8-4
Adjust Daylight Savings Time
Forces the clock to add, or subtract, 1-hour.
• This command simplifies the semiannual job of resetting the clock for
customers affected by Daylight Savings Time. Instead of resetting the
entire clock and calendar, use this command to add or subtract one hour.
• Don’t use the “fall back” command between midnight and 00:59 AM.
Otherwise, the hour will change to 23 (11:xx PM), but the day won’t roll
back. You will gain another day at midnight.
• Don’t use the “spring ahead” command between 11:00 PM and midnight.
Otherwise, the hour will change to 00, but the day won’t roll forward. You
will lose a day.
• If you are using the Scheduler to automatically “fall back”, use the version of
the “fall back” command with the inhibit. This prevents the scheduler from
executing the command more than once.
Command Form:
Command Form Data Digit
Adjust Daylight Savings Time (PW) 48 x * 0 = “fall back”
(subtract 1 from
hours)
1 = “spring ahead”
(add 1 to hours)
2 = “fall back”
prevented from
being executed a
second time for 61
minutes.
Acknowledgment: Sends OK
Errors:
Error Meaning
? err 1 wrong number of digits entered
? err 2 illegal digit entered
Default Condition: None
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