CORRIGO E VENTILATION VARIABLES FOR EXOLINE AND MODBUS 3.6 MANU

10 Chapter 2 System integration using Modbus
Chapter 2 System integration using Modbus
Configuration
The communication parameters for the Modbus line is the most important thing to configure first. As
described earlier, these parameters must be identical in both the master unit and slave units, since they
define the structure of messages and the transmission speed.
The default configuration values of a Corrigo controller are shown in the figure below.
Corrigo is set to Slave Address 1 as a default. If more units are added, a new Modbus address can be
set for each unit using the Corrigo display or E tool
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Transmission mode
Corrigo uses the RTU transmission mode; not to be confused with the ASCII mode in the settings.
The settings for the transmission mode must be the same in the master unit and the slave units, since
Modbus/RTU cannot understand Modbus/ASCII messages. The configuration parameter Word length
is always 8 for Modbus/RTU.
Writing values
To override the Corrigo output values, set the output to manual mode using a Modbus signal. Then
set the corresponding ..._ManSet signal to the wanted level. These signals are listed in Chapter 5:
Holding Registers. Remember that only values with a default value are adjustable, you will find these
in the chapters Coil Status Register and Holding Register.