2 UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual
Chapter 1: UDC-5212 Universal Digital Clock
Introduction
The UDC-5212 Universal Digital Clock is a silent, digitally controlled,
self-setting clock with an analog-looking face. It may operate either
stand-alone via power line frequency or internal crystal, or with a
SMPTE or EBU serial timecode input as either a clock or a timecode
reader.
When provided with a SMPTE or EBU timecode source, the UDC-5212
is instantly self-setting.
In the event of a power failure, the UDC-5212 maintains the correct
time internally via a battery-backed timekeeping memory. If power
should be restored without timecode, the UDC-5212 will self-set to the
correct time as maintained by the battery backup, and then continue to
operate on internal crystal or power line timebase.
The UDC-5212 clock may operate with either a sweep or single step
second “hand” as simulated by the perimeter LEDs. The UDC will also
automatically decode either SMPTE or EBU timecode inputs.
Additionally, the UDC may function as a timecode generator when
operated from its internal crystal. Either SMPTE or EBU timecode may
be generated and used to drive other clocks.
The UDC-5212 clock is compatible with a user-defined auxiliary offset
and date when driven from a MTG-3901, CSD-3901/3902, or
CSD-5300 Master Clock System Driver. A local offset can also be
programmed for any offset up to 23:59:59. Time display can be in either
12 or 24 hour format and may display hours:minutes:seconds or
minutes:seconds.frames. When available, the date may be displayed as
month:day:year or day:month:year.
In the event of an input timecode failure, the colon LEDs will flash at
the rate of twice per second. The UDC clock will then automatically
switch to the user-selected secondary timebase, either power line
frequency or internal crystal. (The power line frequency is
automatically determined during power-up.)
If timecode operation is not required, the UDC clock may be set to use
the secondary timebase permanently, and the colon LEDs will not flash.
If operated as a timecode reader display, the UDC continually tracks the
input code and stops when the input fails.
The colon LEDs extinguish when timecode is absent in this mode.
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