RFC-1 Advanced Operation page 6.12
6.4 Clock and Calendar
The clock and calendar are used by the RFC-1 to trigger events by the date and time. Enhancements to the timing
system give the RFC-1 very good long-term accuracy. The clock will attempt to synchronize with the AC main supply
when the RFC-1 is powered from either a 50 Hz or 60 Hz AC supply.
The time and date are lost when the system loses power. When power returns, the clock does not run until an
operator resets it. A small external UPS provides an easy solution for this issue.
6.4.1 Setting the Calendar
Set the calendar in the RFC-1 by entering the command 70 in normal operating mode. The RFC-1 will respond by
reading the current month, day and year in its internal calendar. Then it will give an option to adjust the calendar with
the prompt, “push # to reprogram”. Press the # key to set the date. The RFC-1 will ask for two-digit month and day
and four-digit year. Enter the appropriate digits at each prompt. Use leading zeros for values less than 10.
6.4.2 Day of the Week
Some date/time functions can be programmed to occur only on certain days of the week. To support these features
the RFC-1 determines the day of the week based on the calendar date. This task is performed automatically when
the calendar is set. There is no user command to set the day of the week.
To read the day of the week, enter the command 70 as if reading the calendar date. At the “push # to reprogram”
prompt, press the ❊ key. The RFC-1 will respond with the word “day” followed by a number from 1 to 7 representing
the day of the week. 1=Monday, 2=Tuesday, 3=Wednesday, 4=Thursday, 5=Friday, 6=Saturday, 7=Sunday.
6.4.3 Setting the Clock
Set the clock in the RFC-1 by entering the command 71 in normal operating mode. The RFC-1 will respond by
reading the current hours and minutes in its internal clock. Then it will give an option to adjust the clock with the
prompt, “push # to reprogram”. Press the # key to set the clock. The RFC-1 will ask for the two-digit hour and
minute. Enter two digits at each prompt. Use a 24-hour clock and use leading zeros for values less than 10. The
seconds reset to zero when the last digit is entered.
To avoid random time triggering issues, the RFC-1 clock freezes at power up with 0 hours and 99 minutes. The clock
can be stopped any time by setting those values.
6.4.4 Automatic Daylight Saving Time Adjustment
When this feature is enabled, the RFC-1 will adjust the clock automatically in areas of the United States that observe
Daylight Saving Time. The calendar must be set to the correct date for this option to work properly.
The time change occurs according to the rules established in 2007. The clock is set forward one hour at 2:00 AM on
the second Sunday in March and it is set back one hour at 2:00 AM on the first Sunday in November.
To Next Page
Loading...
Need help?
General
