16 UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual
Chapter 2: DTD-5225 Series Digital Time/Date Display
Introduction
The DTD-5225 Digital Time/Date Display Clock is a silent, digitally
controlled, self-setting clock. 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 DTD-5225
is instantly self-setting.
In the event of a power failure, the DTD-5225 maintains the correct
time internally via a battery-backed timekeeping memory. If power
should be restored without timecode, the DTD-5225 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 DTD will automatically decode either SMPTE or EBU timecode
inputs. Additionally, the DTD 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 DTD-5225 clock is compatible with a user-defined auxiliary time
offset and date when driven a MTG-3901, CSD-3901/3902, or
CSD-5300 Master Clock System Driver. A local offset can also be
programmed for 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 a timecode input failure, the colon LEDs will flash at the
rate of twice per second. The DTD 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 DTD 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 DTD 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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