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GFK-1084B Chapter 2 Installing the Ethernet Interface
Board Indicators
There are four LEDs on the Ethernet Interface: OK, LAN, SER, and STAT. Each of these
LEDs can be ON, OFF, BLINKING slow, or BLINKING fast. They indicate the state of the
Interface, traffic on the network port (LAN ONLINE LED), and that an exception event
has occurred.
All LEDs are briefly turned ON whenever the Restart button (described below) is re-
leased. This permits the operator to verify that all LEDs are operational.
See “Procedure 3. Verifying Proper Power-Up of the Ethernet Interface” for more LED
information.
Restart Button
The Restart button serves four functions: LED test, Restart, Restart and enter Software
Load state, and Restart and enter Maintenance state. These four functions behave simi-
larly in all states except for the Software Load state. While in this state, pressing the but-
ton will cause an immediate restart into the Operational state if the software in the
Ethernet Interface has not been corrupted or erased. If the software has been cor r upted
or erased, pressing the button will cause an immediate restart back into the Software
Load state. The following text describes Restart button behavior while not in the Soft-
ware Load state.
Pressing the Restart button will disrupt communications.
LED Test: Any time the Restart button is released all the LEDs flash ON. The operator
should visually verify that all the LEDs go OFF and then ON at this time. Then the In-
terface performs either a restart, a restart and enter Software Load state, or a restart and
enter Maintenance state, depending on the duration that the operator depresses Restart.
Restart: Pressing the Restart button momentarily (less than 5 seconds) requests a restart
of the Ethernet Interface. When the Restart button is pressed, all LEDs go out. When it
is released, all LEDs flash ON, then power-up diagnostics run, and the software on the
Interface is restarted into the Operational state.
Restart and Enter Software Load State: Pressing and holding the Restart button for be-
tween 5 and 10 seconds forces a restart and requests entrance to the Software Load state.
A reload is used to install a software update into the module and is not part of normal
operation. When the Restart button is pressed, all LEDs go out. After 5 seconds have
elapsed, the STAT LED (bottom LED) comes ON, to indicate that the Ethernet Interface
will request a reload. After the Restart button is released, all LEDs flash ON, then pow-
er-up diagnostics run, and the Ethernet Interface waits to be loaded with all LEDs blink-
ing in unison.