Specifications

Options 27
4.5 Traffic Light Option
The Laserlight 4-SG remote display also comes with a traffic light option which uses 4" display digits in the 6"
enclosure. The traffic light is factory configured to be controlled with serial commands (as described in Section
3.7 on page 20), but can be controlled by using dry contact switches: one switch, or two switches. The following
photo illustrates the location of the traffic light board and the wiring for it and table 4-3 illustrates the wiring
from the traffic light board to J1 on the Laserlight CPU board.
Figure 4-4. Back of the LaserLight 4-SG Remote Display Showing CPU Board Location and Traffic Light Option
Wiring the traffic light board is explained below.
4.5.1 Dry Contact Wiring
The Dig 0 and Dig 1 pins on the traffic light board (pin 2 and pin 3 on connector J1 respectively) have pull up
resistors so that the operation of the traffic light can be controlled by switching the Dig 0 or Dig 1 (or both) to
ground.
NOTE: a reset to the Laserlight CPU board will set
the D0 and D1 pins on the Laserlight CPU (pins 5 and 6 on
J1) to a high pulled up state therefore, the default state of the traffic light will be a stop light (red).
Signal
Traffic Light Board Location
J1
Laserlight CPU Board
Location J1
Corresponding
Wire Color
5 VDC 1 4 Red
DIG O 2 5 Green
DIG 1 3 6 White
GND 4 7 Black
Table 4-3. Traffic Light Wiring
J1
Location
on the
Laserlight
CPU
board
J1 location
on the
traffic light
option
board