ELWA
®
Modbus Interface Operation Manual, 171018
A proper communication between ELWA und ELWA Modbus Interface is only possible with
exact positioning (see assembly instructions).
4. Pins
Power supply Either with the provided power supply unit via Micro USB interface
(5VDC) or with 12-24V DC at the two pins +24V/GND
Temperature sensor Connect the provided temperature sensor at the two „Temp“ pins.
Polarity does not matter.
Modbus Connect the Modbus at the pins A D+ and B D-.
Consider polarity!
5. Functionality
The ELWA Modbus Interface is a link between the ELWA and a Modbus based bus system.
Because of the bus capability the allocation of bus addresses is required when there are
multiple devices in operation (register 1030).
The bus address is saved in the interface, not in the ELWA.
Furthermore the interface can control the hot water securing of ELWA by the provided
temperature sensor. For this purpose the following settings have to be made:
The hot water securing (Boost) even is operative without an active Modbus.
Assuming that the additional temperature sensor in the boiler is positioned higher than the
ELWA, it is recommended to set the boost-temperature on the interface (register 1009) a little
higher (e.g. 70 °C). Thereby the ELWA-internal control for hot water securing can be
circumvented.
The ELWA-internal control of the boost-time needs also to be adjusted. The corresponding entry
(register 1020) has to be set to 1441.
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