Digital BUS-WATCH
®
R1001 / R4001
Date/Time (continued)
GMT OFFSET is for use with the GPS and TIME SYNC, as GPS satellite
time comes in as GMT and needs to be offset for your time zone for proper
automatic time synchronization.
DST, when set to Yes, will make the system clock 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.
DST MODE can be changed from AUTO to CUSTOM. The reason for
this is because 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 begins on the second Sunday of March
and ends the first Sunday of November. Congress retains the right to revert the
Daylight Saving Time back to the 1986 time schedule. Because of this, certain
real-time clock embedded systems need to have the ability to be changed. Figure
33 shows the default Daylight Saving Time settings in 2007. The DST Mode can
be set from ‘AUTO’ to ‘CUSTOM’. When the DST Mode is set to ‘AUTO’, the
Daylight Saving Time triggers will conform to the 2007 rules. 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,
as shown in Figure 34 below.
Figure 34: Custom DST Triggers
Page 45 of 96
Radio Engineering Industries, Inc.
640370 -- Rev 0 -- 8/17/2007
