User manual

Digital BUS-WATCH®
29
Radio Engineering Industries, Inc.
640333
Rev 0 -- 1/1/2006
Daylight Saving Time
When set to Yes, the system clock will change automatically with Daylight Saving
Time. If your region does not use Daylight Saving Time, setting this item to No
disables the Daylight Saving Time function.
24-Hour Mode
When set to Yes, the clock will be displayed in a 24-hr format. If set to No, the
clock will be displayed in a 12-hr. format.
DST Trigger Menu
On August 8, 2005, President George W. Bush signed the Energy Policy Act of 2005.
This Act changed the time change dates for Daylight Saving Time in the U.S.
Beginning in 2007, DST will begin on the second Sunday of March and end the first
Sunday of November. The Secretary of Energy will report the impact of this change to
Congress. Congress retains the right to revert the Daylight Saving Time back to the
2005 time schedule once the Department of Energy study is complete. Because of
this, certain real-time clock embedded systems need to have the ability to
automatically change in 2007 to the new times, but also be able to be changed back
in case they change their minds. Figure 20 shows the default Daylight Saving Time
settings in 2006. The DST Mode can be set from ‘AUTO’ to ‘CUSTOM’. When the
DST Mode is set to ‘AUTO’, the Daylight Saving Time triggers will change to the new
rules in 2007 as shown in Figure 21. When the DST Mode is set to ‘CUSTOM’, the
Daylight Saving Time triggers can be changed to any of the first, second, third, fourth,
or last week of any month, not overlapping.
2006 DST Trigger Screen Shot
Figure 20