Maintenance and Troubleshooting
4-7
The rotary switches set the hardware address, which the software uses to identify that
particular display. When replacing a controller board, be sure to set the rotary
switches in the same address configuration as the defective controller. Each
controller in a network needs a unique address.
Note:
Setting both rotary switches to address 0 (set the switches to 0 by rotating
them counter clockwise until the arrow points to 0) can activate a test mode. The
display’s power must be turned off and then turned back on to activate the test mode.
Controller Address Settings
Address Upper Lower
Address
Upper Lower
Test Mode
0 0
10
0 A
1
0 1
11
0 B
2
0 2
12
0 C
3
0 3
13
0 D
4
0 4
14
0 E
5
0 5
15
0 F
6
0 6
16
1 0
7
0 7
17
1 1
8
0 8
…
… …
9
0 9
240
F 0
Diagnostic LEDs are located on the controller; the table below tells what each LED
denotes:
CPU
LED Color
Function Operation
DS1
Red
CAN TxD
Flashes when controller is transmitting CAN information.
DS2
Red
CAN RxD
Flashes when controller is receiving CAN information.
DS3
Red
System Reset
Off when controller is functioning properly. Flashes at 1.5-
second rate if controller is not resetting the watchdog timer.
DS4
Red
Run
A steady flash indicates the controller is running properly.
Normal flash rate is about once per second.
DS5 Red
U15
Programmed
On when U15 contains a valid logic program.
DS7
Red
Link
On when Ethernet interface is in the link-up condition.
Flashes when the Ethernet chip detects transmits or
receives activity.
DS8
Red
Speed
On when the Ethernet interface is at 100Mbps. Off when
the Ethernet interface is at 10Mbps.
DS9
Red
Duplex
On when the Ethernet interface is at full duplex. Off when
the Ethernet interface is at half-duplex.
DS10
Red
Collision
Flashes when the Ethernet interface detects a collision in
half-duplex.
