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GFK-1541B Chapter 2 Installation 2-3
2
LEDs
There are four LEDs on the CMM321 module. Each of these LEDs can be ON, OFF, or
BLINKING.
LED Indication Function
OK State of the Ethernet Interface
LAN Traffic on the network port
FDX Configuration of Full Duplex mode.
STAT An exception event has occurred
All LEDs are briefly turned ON whenever a restart is performed in the Operational state by
pressing and releasing the Restart pushbutton (described below). This allows you to verify that all
LEDs are operational. (On module versions EF or earlier, the FDX LED is labeled "SER".)
Restart Pushbutton
The Restart pushbutton serves four functions: LED test, Restart, Restart and enter Software Load
state, and Restart and enter Maintenance state. These four functions behave similarly in all states
except for the Software Load state. While in this state, pressing the pushbutton will cause an
immediate restart into the Operational state (without performing the LED test) if the software in
the Ethernet Interface has not been corrupted or erased. If the software has been corrupted or
erased, pressing the pushbutton will cause an immediate restart back into the Software Load state.
The following text describes Restart pushbutton behavior while not in the Software Load state.
Pressing the Restart pushbutton will disrupt Ethernet communications.
LED Test:
Any time the Restart pushbutton is released,
all
the LEDs flash ON. You should
visually verify that all the LEDs go OFF and then ON at this time. Then the Interface performs
either a restart, a restart and enter Software Load state, or a restart and enter Maintenance state,
depending on the duration that you press the pushbutton.
Restart:
Pressing the Restart pushbutton momentarily (less than 5 seconds) requests a restart of
the Ethernet Interface. When the Restart pushbutton 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.