BAC-9000 Series Controller Installation Guide 6 921-019-01F
POWER AND COMMUNICATION STATUS
The status LEDs indicate power connection and
network communication. The descriptions below
describe their activity during normal operation (at
least 5 to 20 seconds after power-up/initialization
or restart).
NOTE: If both the green READY LED and the
amber COMM LED remain OFF, check
the power and cable connections to the
controller.
Green READY LED
28
After controller power-up or restart is complete,
the READY LED flashes steadily about once per
second, indicating normal operation.
Amber (BACnet MS/TP) COMM LED
29
During normal operation, the COMM LED
flickers as the controller receives and passes
the token over the BACnet MS/TP network.
When the network is not connected or
communicating properly, the COMM LED
flashes more slowly (about once a second).
28
29
Green ETHERNET LED
30
NOTE: The Ethernet status LEDs
indicate network connection and
communication speed.
The green Ethernet LED stays ON when the
controller is communicating with the network.
The green Ethernet LED is OFF when the
(powered) controller is not communicating
with the network.
30 31
Amber ETHERNET LED
31
The amber Ethernet LED flashes when the
controller is communicating with a 100BaseT
Ethernet network.
The amber Ethernet LED remains OFF when
the (powered) controller is communicating
with the network at only 10 Mbps (instead of
100 Mbps).
NOTE: If both the green and amber Ethernet
LEDs remain OFF, check the power and
network cable connections.
MS/TP NETWORK ISOLATION BULBS
32
The two network isolation bulbs
32
serve three
functions:
Removing the (HPO-0055) bulb assembly
opens the MS/TP circuit and isolates the
controller from the network.
If one or both bulbs are ON, the network is
improperly phased. This means the ground
potential of the controller is not the same
as other controllers on the network. If
this happens, x the wiring. See Connect
(Optional) MS/TP Network on page 5.
If the voltage or current on the network
exceeds safe levels, the bulbs blow, opening
the circuit. If this happens, x the problem and
replace the bulb assembly.
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