Page 50 AN-X4-AB-DHRIO (DH+) Nov 2022
Troubleshooting
LEDs
The AN-X4-AB-DHRIO has LEDs that indicate the state of the Ethernet connection, the
connection to Data Highway Plus network status (NS) and the overall module status (MS).
Ethernet LEDs
There are two LEDs that indicate the state of the Ethernet connection, above the Ethernet
connector.
The yellow LED is on if the link is running at 100 Mbits/second and is off otherwise.
The green LED is off if the link is inactive and is on if the link is active. If activity is detected,
the link blinks and continues blinking as long as activity is present.
If the AN-X4 is not connected to Ethernet, both LEDs are off.
MS LED
The MS LED is used by the AN-X operating system and software to indicate the state of
operations and errors.
It should be used in conjunction with the logs to locate the cause of problems.
In the following, red/3 means three red flashes followed by a pause.
Powerup/Reboot
MS LED NS LED Meaning
RED RED Initial Boot Code / Secondary Program Loader (SPL)
YELLOW RED U-Boot
RED RED Kernel Starting
YELLOW/2 RED Waiting for IP (DHCP) or invalid IPConfig.txt
YELLOW/3 RED Factory Mode, could not find AN-X4-TEST-xx Firmware
YELLOW/4 RED Firmware/FirmwareCfg.txt Not Found
YELLOW/5 RED Firmware image in FirmwareCfg.txt Not Found
YELLOW/6 RED Firmware Image Invalid (Bad ChkPat)
YELLOW/7 RED Firmware Image Board ID Mismatch
YELLOW/8 RED Startup Script Not Found
GREEN/2 OFF Factory mode
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