Concept
KNX Modbus Gateway Manual Operation Mode
The manual operation mode enables you to perform two types of operations:
KNX object synchronization
KNX read operation
The manual operation can be used, for example, during the commissioning and configuration process to check that the device configuration is correct.
The manual operation can be enabled and disabled in ETS through the Manual operation (sync) on device parameter. For more information, see ETS Database for the KNX Modbus Gateway .
The KNX object synchronization affects all channels in the direction to KNX.
The synchronization is performed by a KNX write operation, which means that all channels configured in ETS as Modbus to KNX send their current datapoint values on the KNX bus.
You start the synchronization by pressing and holding the KNX write button for more than 2 seconds. For more information, see KNX Modbus Gateway Buttons .
When the device is in manual operation mode, the Mode LED is lit orange. For more information, see KNX Modbus Gateway LEDs .
The synchronization can be cancelled by pressing the KNX write and KNX read buttons at the same time. For more information, see KNX Modbus Gateway Buttons .
The KNX read operation affects all channels in the direction to Modbus (RP-C controller).
KNX read means that all datapoints of the channels configured as KNX to Modbus receive the current value from the KNX bus. The Modbus KNX gateway stores the received values and sends them to the RP-C controller (Modbus master) only upon request.
For KNX read, ensure that the following Flags are configured in the ETS Settings for the group objects:
For all channels configured as KNX to Modbus (inputs): Communication (C) , Write (W) , Transmit (T) , and Update (U) .
For the KNX devices that shall respond to the read requests: Communication (C) , Read (R) , and Transmit (T) .
You start the read operation by pressing and holding the KNX read button for more than 2 seconds. For more information, see KNX Modbus Gateway Buttons .
When the device is in manual operation mode, the Mode LED is lit orange. For more information, see KNX Modbus Gateway LEDs .
The read operation can be cancelled by pressing the KNX write and KNX read at the same time. For more information, see KNX Modbus Gateway Buttons .
Hardware Overview
KNX Modbus Gateway RP-C-EXT-KNX
ETS Database for the KNX Modbus Gateway
KNX Modbus Gateway Buttons
KNX Modbus Gateway LEDs
Performing a Factory Reset of the KNX Modbus Gateway