Introduction
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 + -
