IM 743-7 • MICROTECH II CHILLER UNIT CONTROLLER 8 www.DaikinApplied.com
Figure 9: Modbus Communication Module Cover
Follow these steps to remove an existing communication
module from unit controller and replace it with a new one.
1. Remove power from the unit controller.
2. Locate the serial card slot on the unit controller
(Figure 3).
3. Pull the network cable connector from the
communication module.
4. Remove the cover from the serial card slot. Use a small
Figure 5
and Figure 6).
5. Grasp the communication module and carefully pull it
from the unit controller.
6. Install the new communication module. Grasp the
module, with the network connector on the underside.
The 8-pin header must mate to the 8-pin plug in the unit
controller. The plug has a guide on each end to direct
it into the mating guide on the communication module
header. Figure 7 shows the serial card slot with the 8-pin
plug that mates to the header on the communication
module.
NOTE:
communication module into the connector than
seeing the connectors mate.
7. Insert the communication module, pointed up, into the
slot. Keeping it level, roll the module into position as
you guide it into the slot, feeling the connectors line up
(Figure 8, Steps 1 and 2).
8. When you feel the connectors align, press the
communication module into the connector. Verify that
Figure 8,
Step 3).
9. Insert the plug-in connector to the communication
module.
10. Replace the cover on the serial card slot. Slip the cover
over the network connector plug (Figure 9).
11. Insert the network cable connector into the
communication module.
12. Connect the communication module to the network
(Figure 10 and Figure 11):
a. Connect one wire of the network cable to Pin 2 of
the connector plug.
b. Connect the other wire to Pin 3 of the connector
plug. Note that no wire is connected to Pin 1
(GND).
Figure 10: Network Cable Routing and Connections
Figure 11: Network Connection Detail
Pin 2
Pin 3
RS-485
Network Cable
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