IM 743-7 • MICROTECH II CHILLER UNIT CONTROLLER 10 www.DaikinApplied.com
Network Configuration
Follow these steps to configure the required parameters for the
communication module. Refer to
Table 2
for default values and
acceptable ranges.
NOTE:
The Network Address (ID or Ident Number),
along with the baud rate, must be set before you
can communicate on the Modbus network. Both
parameters are only available in the unit controller
keypad/display after the BAS protocol is set to
Modbus.
From the unit controller Set/Unit Setpoint menu screen:
1. Set the Network Address (ID Number) to match the
Network Address of the unit controller. The Network
Address of the communication module (slave) must be
unique in the network. Contact the system integrator for
the desired Network Address.
2. Set the baud rate to the desired network data
transmission speed. The baud rate must match the other
slave devices on the network.
Table 2: Network Parameters
Parameter
Default/Range
Description
Network Address
0-247
Default: 1
The Modbus Address (i.e.
ID or Ident Number) of the
communication module. This
must be unique throughout the
entire network
Baud Rate
1200, 2400, 4800, 9600,
19200
Default: 19200
Data transfer speed (bps) of the
Modbus network.
Additional Modbus Configuration
Parameters
The communication module and unit controller support a
number of Modbus setpoints. After the unit controller has
been set up for Modbus communication, the default values of
these setpoints can be modified to enable control or monitoring
of chiller operation via the network. The setpoints may be
changed from the BAS or the unit controller.
Refer to the MicroTech II Chiller Unit Controller Operation
Manual (
Reference Documents
) for menu options
and instructions. The MicroTech II Chiller Modbus
Protocol Information Document, ED 15063, provides
descriptions of all network parameters for BAS integration
(www.DaikinApplied.com)
.
