Modbus page
Modbus
Modbus devices are connected to terminals 15 and 16.
Modbus Settings for RFTC-3
RFTC-3 operates as a Modbus Master for controlling FCU or heating units. The Modbus settings allow configuration of communication parameters and the list of connected devices.
Modbus Setting
This section allows you to configure the basic communication parameters according to the requirements of the connected unit:
Baudrate – Transmission speed
Parity – Parity check
Stop Bit – Number of stop bits After setting the values, confirm the changes by clicking Change.
List of Modbus Devices
This section lets you add or remove Modbus devices. Options:
Add device – Add a new device
Delete device – Remove an existing device When adding a device, enter the following:
Slave ID – The device identifier in the Modbus network (found in the device's documentation)
Description – A user-friendly name for easy identification Registers for control:
ON/OFF – Register to turn the device on or off
Set Temperature – Register for setting the desired temperature (with appropriate multiplier)
Fan Speed – Register for controlling fan speed (with specific regulation sequence)
Mode – Register for changing between heating/cooling modes (with appropriate switching logic)
Swing – Register to control louver movement
Note: Not all fields are mandatory. They can be activated using the parameter
activation=ON. Only one unit can be configured and connected this way. Refer to the documentation of the connected devices for all required setup details.
Control
ON/OFF – Can be controlled from the RFTC-3 display via the ON/OFF button
Set Temperature – RFTC-3 sends the desired temperature to the unit
Fan Speed – RFTC-3 sends the desired fan speed
Mode – Controlled via the "Mode" button on the display
Swing – Remains active if
activation=ON