UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual
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Chapter 2: DTD-5225 Series Digital Time/Date Display
Operation
Clock Mode
To set the DTD-5225 to operate as a timecode reading clock, DIP
switch 6 must be in the CLOCK position. No setting of time is required
when input timecode is provided to the DTD-5225 clock. Once valid
timecode is detected, either SMPTE or EBU, the clock will instantly
self-set.
If there is a failure or error with the input timecode, the clock will
switch to the secondary reference as selected by DIP switch 4 on the
rear panel. Either the clock’s own internal crystal or the power line
frequency may be selected as the secondary reference. Both will
provide the clock with a timebase during the absence of input timecode.
(Note that either a 50 Hz or 60 Hz power line frequency is suitable for
the timebase, since the clock automatically selects the correct frequency
available.)
To signal the failure of the input timecode, the colon LEDs on the clock
face will flash at a rate of twice per second. When correct timecode is
re-established, the clock will again self-set to the new time, and the
colon LEDs will stop flashing.
Similarly, if there is an error in the input timecode, the clock will
automatically switch to the secondary reference, and the colon LEDs
will flash.
When used in Clock mode, the DTD may display time in either 12- or
24-hour format. DIP switch 1 selects the display format; 12-hour format
uses the
AM/PM LEDs, while the 24-hour format does not.
Timecode Reader Mode
To set the DTD-5225 to operate strictly as a timecode display, DIP
switch 6 must be in the TIMECODE position. When input SMPTE or
EBU timecode is present, the DTD will follow it directly, either up,
down, or paused.
If there is a failure of input timecode, the colons will extinguish and the
last valid time will remain displayed.
No switching to a secondary
reference occurs
.
