Daktronics Data Time Series 50 Time & Temperature Displays - Manual (Page 42)

Operation 4-8
4.7 Operation without Temperature Sensor/Light Detector
Although the time and temperature display was designed to be operated with a temperature
sensor/light detector, there may be situations when it will be required to operate without one.
(Such as when the sensor has failed and the replacement has not yet arrived, or in systems
where the temperature will not be used.)
If the sensor is disconnected, the display driver will sense this and will not display any
temperatures. When the sensor is reconnected, the display will again show any temperature
values as selected by the Display Sequence. Therefore it is not necessary to change any
settings on the display if the sensor is being disconnected for a short period of time (such as for
replacement). If it is desired to permanently operate without a temperature sensor/light
detector or if the sensor is used for the photocell only, set Function 2 (Display Sequence) to a
value that does not include temperature. Without a sensor, Dimming (Function 3) must be set
to Manual Bright or Manual Dim.
4.8 Switch Settings
The display controller has a set of eight switches in a package (DIP Switch) that also set some
of the operations of the controller. Refer to Drawing A-87841 in Section 3 for an illustration
of the location of these switches on the controller. The first switch, SW1, will put the
controller into a Lampbank Test mode when it is turned ON. When the test is started, the
display will show the software revision number in the right-hand digit for three seconds. The
test will then alternately turn the display lamps ALL ON for five seconds, then ALL OFF for
one second until SW1 is turned OFF again. If SW2 is turned ON while SW1 is ON, the
display lamps will cycle through a pattern of digits.
The display controller can get its time base from one of two sources: a 50 or 60 hertz power
line frequency, or its internal real time clock (RTC). When the controller is first turned on, it
will sample the power line frequency to ensure that there is an accurate 50 or 60 hertz
frequency. If the frequency is not accurate, the controller will use the internal real time clock.
The controller can also be forced to run off the real time clock with switch SW3. Turn SW3
ON to force the display driver to run off of the internal real time clock. This switch is only
checked on power-up. It is preferred to use the power line frequency.
The Series 50 display can be run in either a 12-hour or 24-hour time format. Turn switch SW4
OFF to run in 12-hour format. Turn SW4 ON to run in 24-hour format. This switch is only
checked on power-up.
The controller will automatically adjust the time for daylight savings changes if SW5 is OFF.
The time will be advanced by one hour at 2 a.m. on the first Sunday in April. The time will be
set back one hour at 2 a.m. on the last Sunday in October. This function will be disabled if
SW5 is turned ON.
If the indoor control option is used, SW6 must be ON. If an eight-column driver (12” model) is
used instead of a 16-column driver, SW7 must be turned ON.
If the display being controlled uses standard 7 or 8 segment digits, SW8 must be turned ON.
This mode will only allow use of display sequences 0-7 of Function 2 (Section 4.4).