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Chapter 5 Troubleshooting
Electrical
5-7
TC1920 Rev 1.3 User Manual
5.4.1.5
Alarm
The LED will illuminate solid red, and the dry contact
relay (if present) will close when an alarm condition is
detected. The user can configure which types of alarms
will trigger the unit alarm.
Normally in the OPEN position, any alarm condition will
trigger the switch to the CLOSED position. The switch
position is controlled by a relay inside the TC1920.
ALM LED Behaviors
5.4.1.6
Link
The LED indicates the link status summary between the
local and remote units.
LINK LED Behaviors
5.4.1.7
BP1 and BP2
These LEDs indicates the link status of the Ethernet
ports on the back of the unit.
BP1 and BP2 LED Behaviors
LED
Condition
Solid
Unit Alarm is triggered.
Off
Unit Alarm is not triggered.
Flash On
Unit Alarm has been triggered since last cleared.
Steady Flash
Unit is in testing/diagnostic mode.
LED
Condition
Solid
Link established with remote unit.
Flash
Unable to establish link with remote unit.
Off
Hotlink heartbeat is disabled.
LED
Condition
Solid
Ethernet link is established.
Flash
Ethernet Tx/Rx activity detected.
Off
Ethernet link not established.