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
Figure 10
for an illustration of the location of these
switches on the controller (S1 through S8). The first switch, S1, will put the controller into a
Pixel 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 LEDs ALL ON for five seconds, then ALL OFF for one second until S1 is turned OFF
again. If S2 is turned ON while S1 is ON, the display pixels 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 S3. Turn S3 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 S4 OFF
to run in 12-hour format. Turn S4 ON to run in 24-hour format. This switch is only checked on
power-up.
SWITCH SUMMARY
SWITCH # FUNCTION
1
Test
2
Alternate
3
RTC
4
12/24
Hour
5
Daylight
Savings
6
Indoor
Controller
7
8 Column Driver
8
OFF
The controller will automatically adjust the time for
daylight savings changes if S5 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 S5 is turned ON.
If the indoor control option is used, S6 must be ON.
DataTime
®
Series 50
OPERATION
13” LED Time & Temp Displays
4-7
