Component Description and Theory of Operation
3
2 Component Description and Theory of Operation
Sign Controller
The sign controller is the component that receives communication from the computer
and then sends data to the modules.
illustrates a sign controller.
Red diagnostic LEDs are located at various places on the controller. The following table
details some essential LEDs to monitor and the information each LED provides. The LED
.
DS3
DS2
Figure 5:
Controller Component Layout
Figure Label
LED Number
Operation
Run
DS4
Steady FLASH about once per second indicates controller is
working properly.
Send signal
(Signal TX)
DS3
OFF is the normal state. FLASH when transmitting
communication to the computer.
Receive signal
(Signal RX)
DS2
OFF is the normal state. FLASH when receiving
communication from the computer.