When DST is disabled, the RTC
operates in standard time only. When
enabled, the device automatically
updates the time at 2:00 AM at the
pre-defined DST switch dates.
The date when Daylight Savings Time
begins. The DST switch point is
specified by the month, week of the
month and weekday. By default, DST
starts at 2:00 AM on the first Sunday
in April of each year.
The date when Daylight Savings Time
ends. The DST switch point is
specified by the month, week of the
month and weekday. By default, DST
ends at 2:00 AM on the last Sunday
in October of each year.
Daylight Savings Time
The daylight savings time option is enabled in the PM175 by
default, and the default daylight savings time change points
are preset for the U.S.A. When the daylight savings time is
enabled, the meter automatically adjusts the device clock at
02.00 AM when daylight savings time begins/ends.
If the daylight savings time option is disabled, you need to
manually adjust the device clock for daylight savings time.
Time Synchronization Pulses
External time synchronization pulses can be delivered through
one of the digital inputs. If a digital input is selected as the time
synchronization source, the edge of an external pulse adjusts
the device clock at the nearest whole minute. The time
accuracy could be affected by the debounce time of the digital
input, and by the operation delay of the external relay.
Using Digital Inputs
The meter is provided with two digital inputs that can trigger
the alarm/control setpoints to give an alarm on input status
change, or can be linked to the energy/TOU registers to count
pulses from external watt meters, or gas and water meters.
To configure them in your device, select the device site from
the list box on the PAS toolbar, select General Setup from the
Meter Setup menu, and then click on the Digital Inputs tab.
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