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C2900M-B (1/03) 75
Ethernet LEDs
The green Ethernet LED should light when the Ethernet connection is made. If this LED is off:
Green Ethernet LED Is Off
• Make sure the network cable is firmly connected to the hub or switch.
• Does the hub or switch work correctly in the network? Check the power supply of the hub or
switch.
• Use a Cat5 straight-through cable to connect to a normal hub. Check the cable for physical
damage.
• Use a crossover cable if connecting a unit directly to a PC without a hub.
Yellow Ethernet LED Is Flashing
The yellow LED flashes briefly whenever a unit transmits a data packet (for example, when
accessing the unit with a web browser). If this LED fails to come on, perform the following checks:
• Are all units connected correctly with the power supply? Check power supplies and
connections.
• Did you configure the correct IP address for your unit?
• Is your web browser configuration correct?
• Is the TCP/IP protocol installed on your PC operating system, and is an IP address assigned to
the PC?
• Are the subnet mask and gateway properly set up?
Contact your network administrator if you have problems installing your network.
Com LED
This green LED should flash when data is transmitted via serial interface.
Output LEDs
If green LED is lit, then the alarm output is switched. If not lit, then the output is inactive (idle
state).
Input LEDs
If the LED is not lit, then the alarm input is inactive.
If the LED is lit green, then the alarm input is activated. If lit red, then the alarm is triggered.
If the LED changes from red to green, then program memory is being deleted (during firmware
upload). The programming progress is indicated by the alternating green lighting of all five LEDs.