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1.3. Type of Modbus Network
The following graph provides a graphic representation of the type of network to be created using
DConnect + BMS.
The DConnect Box, equipped with the additional device for MODBUS RTU, represents the interface
between the pumps and the BMS supervisor: it collects the information of the DAB electronic pumps
listed in paragraph 3.6 Product Type and displays it in a single object that can be queried by a control
unit via Modbus RS485 RTU.
2. Modbus Configuration
2.1. Updating the DConnect Box
The use of the optional Modbus RTU interface requires a software update of the DConnect Box. To
do this, make sure that there is an Internet connection via Ethernet or WiFi. See the Internet site
https://internetofpumps.com for further details on the installation and use of the DConnect Box.
2.2. Wiring
Connect the interface accessory to any USB port on the DConnect Box. See the DConnect Box
manual for the connection of the pumps.
Connect the Modbus interface accessory to the Modbus RTU controller as follows.
Modbus communication with 2-wire RS485 contemplates the use of 2 cables, A and B plus a possible
GND for shielding. It is recommended to use a cable with the following characteristics:
Cable suggested for MODBUS RTU
Multipair twisted cable 0.22 mm², 250 V, F/UTP shielding, PVC sheath.
Connect the cable according to the standard nomenclature:
Before starting work, disconnect the power from the supply line and use only the
recommended cables and accessories.