Status Led; Network Led; Bacnet Network Connector; 8-Pin Header - Daikin MicroTech II Installation And Maintenance Manual

Status LED

The Status LED indicates the communication state between
the communication module and the unit controller.
describes the activity of the Status LED. During power-up or
restart, the Status LED shows the following sequence:
• Immediately after startup: quick flashing red-green
• ~2 seconds after startup: steady green
• ~30 seconds after startup: regularly flashing green
Once the startup process is complete, the Status LED
consistently flashes green when the module is operating
correctly. The table below describes the color and activity of
the Status LED.
Table 1: Status LED Activity - Current Hardware
Status LED Color Description
Communication is established between the
Quick flashing green
communication module and the unit controller.
Communication has not been established between
Solid red with occasional the communication module and the unit controller
red flashes (check to verify protocol is set correctly at unit
keypad).
The communication module detects an error or a
Green/red flashing
temporary answer fault from the unit controller.

Network LED

The Network LED indicates the communication status between
the BACnet communication module and the BACnet MS/
TP network. Table 2 describes the activity of the Network
LED. During power-up or restart, the Network LED shows the
following sequence:
• Immediately after startup: LED is unlit
• ~20 seconds after startup: LED alternates Green-Red-
Green-Red
Once the startup sequence is complete, the table below
describes the color and activity of the Network LED.
Table 2: Network LED Activity - Current Hardware
Network LED Color Description
Communication is established: The LED activity is
described as follows:
• Green ON: communication module keeps the token
Green with occasional
• Green OFF: communication module does not keep
red flashes
the token
• Red ON: Poll-For-Master; search for a master for
which to pass the token
Green and red ON
Communication is not established. The communication
together (NOTE:
status is in a state of continuous Poll-For-Master.
Because the hardware
Possible explanations are as follows:
uses a multi-color
• Electrical connection error
LED, the Green
• Communication settings at the unit keypad are not
and Red LED's on
compatible with other devices connected to the
simultaneously will
network
appear Amber).
IM 906-4 • MICROTECH II CHILLER UNIT CONTROLLER

BACnet Network Connector

A 3-pin network plug connects the communication module
Table 1 to the BACnet MS/TP network
TP module is a 2-wire EIA-485 device, so only the + (signal
positive) and – (signal negative) terminals should be used.

8-Pin Header

The 8-pin header connects the unit controller to the
communication module

S1, S2, and S3 Switches

Switches S1, S2, and S3 are located inside the front opening
of the cover (Figure 4).
• Switch S1 adds a 510-Ω polarization resistance between
the negative data line (-) and GND
• Switch S2 adds a 120-Ω terminal resistance between the
two data lines (+) and (-)
• Switch S3 adds a 510-Ω polarization resistance between
the positive data line (+) and the +VCC internal voltage
Refer to Installation and Mounting for information on how to set
these switches.

Pushbutton

The pushbutton is used to either reboot the communication
module or temporarily restore the factory defaults
Refer to the Restart or Reset the Communication Module
section for detailed information about when and how to use the
pushbutton.
6
Introduction
(Figure 4). The BACnet MS/
(Figure 4).
(Figure
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4).