Introduction
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5
IM 837-2 • MICROTECH II CHILLER UNIT CONTROLLER
Component Data
The BACnet IP communication module is a printed circuit
board that inserts directly into the serial card slot of the
MicroTech II chiller unit controller.
Figure 1
shows the
communication module when fully inserted, as indicated by
the “BCM” cover label.
Figure 2
shows the important features
of the communication module, which are described in the
following section.
Figure 1: BACnet IP Communication Module Attached to Unit Controller
Figure 2: Communication Module Main Features
Light Emitting Diodes (LEDs)
The communication module has a Status LED and an Ethernet
LED to indicate communication activity and status of the
module. These indicators are visible when the communication
module is connected to the chiller unit controller and the unit is
powered on.
Status LED
The Status LED indicates the communication state between
the communication module and the unit controller.
Table 1
describes the color and activity of the Status LED.
During power-up, the status LED shows the following
sequence:
•
Off
•
Two seconds after startup: quick flashing red-green
• Five seconds after startup: steady green
•
62 seconds after startup: regularly flashing
Once the startup process is complete, the Status LED blinks at
regular intervals.
Table 1: Status LED Activity
Status LED Color
Description
Quick flashing green
Communication is established between the
communication module and the unit controller.
Slow flashing red
Communication has not been established between
the communication module and the unit controller.
Green/red flashing
The communication module detects an error or a
temporary answer fault from the unit controller.
Ethernet LED
The Ethernet LED shows the communication status between
the communication module and the Ethernet network. The
table below describes the status of the Ethernet LED.
Table 2: Ethernet LED Activity
Ethernet LED Color
Description
Red
Communication is not established.
This can be due to several issues,
including a cable defect, no power to
the unit controller, or the cable is not
connected to the network at the other
end.
Green
Communication is established
.
NOTE:
The color of the Ethernet LED is based only on the
electrical connection. The communication module
checks for the right signals from the remote device in
the Ethernet cable. There are no parameter settings
in the communication module that affect this LED.
Network
Connector
Status LED
Pushbutton
Ethernet LED
8-Pin Connector
Summary of Contents for IM 837-2
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