When troubleshooting a Digi EtherLite, one of the key indicators of the EtherLite's status are the LEDs on the unit's front panel.
The LINK LED is an indicator of whether or not the EtherLite has a physical network connection. If LINK LED is lit, the unit believes it has a good connection to the network. If LINK LED is not lit, the first thing to check is the cabling between the EtherLite unit and the LAN hub/switch. Check to make sure both ends of the network cable are securely connected and that a standard (not back to back) network cable is in use. If the cable is securely connected on both ends and the LINK LED is still not lit, replace the network cable with a known-working one from a PC currently on the network, just to verify it isn't the cable. Alternately, an Ethernet crossover-cable could be used to connect the Etherlite directly to the Ethernet port of a Unix or Windows Server, as long as the server itself has a static IP.
The ON LED serves several purposes. If the ON LED does not light at all, the power supply is likely defective. If you have a spare, known-working EtherLite power supply, try using it instead. If the ON LED is lit solid immediately after power is applied, this might also be an indicator that the power supply is defective or that the EtherLite's internal code has been corrupted. Either of these conditions will require that the EtherLite be sent in for repair.
If the ON LED has a fast, steady flicker, this indicates that the EtherLite is waiting to be served an IP address. If an IP address is stored on the unit, the LED will flicker briefly and then turn solid. The same behavior will be observed if the EtherLite is being served an IP address from a bootp or DHCP server, though it may take a bit longer to turn solid than a unit which has a stored IP address.
Occasionally, the ON LED might not behave in any of the ways described above, but instead blinks a "code" or pattern which keeps repeating. This is typically an indicator that the EtherLite's internal OS is corrupted, and the unit will need to be sent in for repair.The only user-serviceable codes are:64 - should be resolved when a user updates the firmware and driver for the EtherLite67 - indicates that the EtherLite is being served an IP address that is already in use on the network68 - the EtherLite has no IP address
For reference purposes, here is a list of all EtherLite blink codes: