20 UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual
Chapter 2: DTD-5225 Series Digital Time/Date Display
When used in timecode mode, the DTD always displays time in 24-hour
format without AM and PM indications. The digits may be configured
for HH:MM:SS display or MM:SS.FF display using DIP switch 1.
Secondary Reference Mode
The DTD-5225 will run as standard wall clock when no input timecode
is provided. Rear panel DIP switch 4 selects the timebase to be used,
either the clock’s internal crystal, or the power line frequency
(50/60Hz). DIP switch 6 must be in the CLOCK position.
Rear panel DIP switch 2 should be switched to the RUN ON
SECONDARY position when the clock is used in this mode. When in
this position, the colon LEDs will NOT flash. Note that the clock will
still function without selecting RUN ON SECONDARY. However, the
colon LEDs will flash at the rate of twice per second to indicate the
absence of input timecode.
When operating in this mode, the time must be set manually using the
rear panel set switches, MANUAL SET, CW, and CCW (see the Clock
Setting Controls section). Once set, however, the correct time is
maintained even in the event of a power failure. Upon the return of
external power, the clock will automatically self-set to the correct time.
The internal battery-backed timekeeping function will maintain time for
up to four years in the absence of external power.
Auxiliary Offset
DIP switch 3 allows access to a user-programmed auxiliary offset from
the input timecode’s user bits. The timecode source, however, must
have the ability to generate the correct information in the user bits.
The MYG-3901, CSD-3901/3902, and CSD-5300 Master Clock
System Drivers are real time timecode source which can program such
an offset into the timecode’s user bits. The offset is programmed in 30
minute intervals up to 23 hours and 30 minutes, using 6 bits of the
timecode’s user bit space.
The offset is encoded using timecode bits 36, 37, 38, 52, 53, and 54. Bit
36 is the least significant bit (LSB), while bit 54 is the most significant
bit (MSB).
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