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10.4 Built-in Modbus RS485 serial board in BMS2 port
Serial Modbus RS485 communication in the BMS2 port of the controller is enabled at all times.
After connecting the serial cable coming from the supervisory control, screen Pq1 in the User menu can be
used to set the communication baud rate (default 19200 bps), whereas the protocol is preset as Modbus. The
next screen - Pq2 - is used to set the bit number, the parity and the communication stop bit.
10.5 Remark relating to supervisory control protocols
The chapter on hardware illustrates the different options to connect the unit controller to supervisory controls.
Based on the serial board used, different management protocols are available, as described above.
The list of variables in the supervisory control is provided in a separate document.
If two management protocols are used simultaneously, the variables in the
supervisory control can be read with both protocols. Similarly, both protocols can be
used to write variables which have write access.
10.6 Activation of Control logic of supply and return plug-fans on temperature
setpoint
To activate the control logic described in chapther 6.3.2 enter in Manufactorer Menu
Plug Fan Branch
Screen Y10.
For units with dampers: it’s possible only to set to “DECREASE”.
For full recirculation unit: set to “DECREASE” or “SWITCH OFF”. If “SWITCH OFF” is set, a confirmation
message appears: accept only if the return probe is installed directly in the conditioned room.
If the control logic “DECREASE” is set, then set the airflow in the Setpoint Menu
Screen S9 e S10.