www.DaikinApplied.com 5 IM 743-7 • MICROTECH II CHILLER UNIT CONTROLLER
Component Data
The Modbus communication module is a printed circuit board
that inserts directly into the serial card slot of the MicroTech II
chiller unit controller as shown in Figure 1.
Figure 1: Modbus Communication Module Attached to Unit Controller
Figure 2 shows the two important features of the
communication module circuit board (the Modbus network
connector and 8-pin header), which are described in the
following section.
Figure 2: Communication Module Main Features
Modbus Network Connector
An RS-485 connector port connects the communication
module to the Modbus network. See Figure 2 for connector
location and the table below for additional details.
Pin Function
1 Reference (GND)
2 Data B (+)
3 Data A (-)
8-Pin Header
The 8-pin header connects the MicroTech II chiller unit
controller to the communication module. See Figure 2 for
header location.
Network
Connector
8-Pin Header
GND + -
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