Keyscan CA250B, Technical Instructions

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Keyscan Inc. – Technical Guide (PC109x - 04.15) 78
CIM Diagnostic LEDs B3 – B0
The CIM unit has on-board diagnostic LEDS - B3 to B0 - designed to assist in troubleshooting communication
difficulties.
 diagnostic LEDs during boot-up - initial power or Reset J1
 data LEDs during operation are TX – transmit
Diagnostic Guidelines
LEDs B3 – B0 indicate TX data transmission states. Diagnostic Jumper J2 - sets the CIM board to run in
diagnostic mode.
CIM Diagnostics – LED Codes
The following table lists diagnostic LED codes on the CIM. LED indicators are as follows:
 0 = OFF
 1 = ON
Place a jumper on J2 to run the CIM in diagnostic mode.
Table 13 – CIM Diagnostic LED Codes
LED Trouble
Indication
Code
Fault
B3 B2 B1 B0
0 0 0 0 0 None
0 0 0 1 1 + 5V logic voltage low
0 0 1 0 2 + 12V input voltage low
0 0 1 1 3 + 5V isolated logic supply low
0 1 0 0 4 CAN Bus 1 fault
0 1 0 1 5 Global broadcast fail
0 1 1 0 6 ACU panel initialize fail
0 1 1 1 7 CAN Bus 2 fault
1 0 0 0 8 CIM to ACU auto-match bit rate fail or incomplete
1 0 0 1 9 Data carrier detect (DCD) connection lost. Applies to reverse
network communication mode only.
Note
Diagnostic mode indicated by all four (4) LEDs flashing three (3) times. Diagnostic codes are displayed
every 20 seconds. Multiple codes are displayed lowest to highest.
End of diagnostics routine is indicated when all four (4) LEDs flash three (3) times.
Unless Power Good/Fault LED is flashing, the unit will not enter unit diagnostics mode even if a jumper is
on J2.