Gilderfluke&Co Sd-50 Audio & Show Controllers - Manual (Page 107)

Schedule Setup
(Sd-50/8 or Sd-50/40)
The RealTime Clock is available on the Sd-50/8s and Sd-50/40s. The Real Time Clock chip provides
the time of day and calendar information that is used to look in the schedule to see if there are any shows
and SoundFiles that need to be played.
A small lithium battery keeps this clock running, even when the Sd-50/8 or Sd-50/40 is powered down
for months. Even without the GPS or ‘Atomic’ Clock kick, this RTC is laser trimmed for an accuracy rated
at +5/-10 PPM. If the Sd-50/8 or Sd-50/40 is left unpowered for an extended period of time, it will run
down the battery, and it may need to be replaced.
For greater accuracy, there are two options:
1)
The GPS option adds a commercially made GPS receiver to the Sd-50/8 or Sd-50/40. The GPS option will
work anywhere on the planet. The receiver is mounted somewhere where it has a view of the sky. The GPS
receivers are IPx7 rated for outdoor use, and are ‘bulkhead’ mounted using a single 5/8” diameter hole. The
fifteen foot long cable from the GPS receiver plugs into a small GPS power module via a six pin mini-DIN
connector. A three conductor cable with 2.5 mm stereo plugs at both ends is then connected between the
power module and the Sd-50/8 or Sd-50/40. The input to the Sd-50/8 or Sd-50/40 is optically isolated. You
can stretch these wires for hundreds of feet, if needed.
The GPS, once it acquires a lock on the satellites orbiting overhead, takes over for the on-board Real
Time Clock inside the Sd-50/8 or Sd-50/40. Every 30 seconds, on the half minute, the GPS clock sets the
RTC chip inside the Sd-50/8 or Sd-50/40. This assures you that even if the GPS loses lock, the internal
clock is set accurately.
2)
The ‘Atomic Clock’ option adds a commercially available ‘Atomic’ Clock module to the Sd-50/8 or Sd-
50/40. The ‘Atomic’ Clock option can be used anywhere radio signals broadcast from Frankfurt, Germany;
Colorado, USA; Rugby, England; Fukushima, East-Japan; and Kysushu, West-Japan can be received. The
time signals broadcast from these stations is accurate to within a second every billion years. Special modi-
fications to the ‘atomic clock’ receiver allow this clock to send a synchronizing signal to the Sd-50/8 or Sd-
50/40 to keep them in sync. A rechargeable Ni-Cad battery keeps this clock running during power outages.
The ‘RTC input’ is used to resynchronize the internal Real Time Clock chip with the external ‘Atomic’
Clock. The time which has been entered in the ‘Mp3 Config.exe’ must agree with the time set for the
alarm on the ‘Atomic’ Clock module.
We are using 3:05:00 as the default resynchronization time. The external ‘Atomic’ Clock MUST be set
so that the alarm goes off at 03:05:00. It is at 3:05 AM so that when daylight savings starts and ends, there
will be no more than one hour before the Sd-50/8 or Sd-50/40 is resynchronized to the appropriate time.
Any earlier, and the daylight savings transition might be missed until the next resynchronization time.
A three conductor cable with 2.5 mm stereo plugs at both ends is then connected between the ‘Atomic
Clock’ and the Sd-50/8 or Sd-50/40. The input to the Sd-50/8 or Sd-50/40 is optically isolated. You can
stretch these wires for hundreds of feet, if needed.
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840-9484 • 800/776-5972 • fax 818/840-9485
Sd-50/xx Manual / October 29, 2012 2:29 PM / page 107 of 120