(Classic) BMS overview

Connecting the Ethernet2DALI system with BMS is based on the LAN network. Use Modbus TCP to connect these systems.

How to design it?

Connect your Vertex LAN network with the LAN BMS network using the Ethernet cable (at least cat. 5e). The BMS connection takes only one LAN port on the industrial switch. Remember to have a few more LAN ports free as a reserve.

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How to commission it?

The Modbus server in Vertex is disabled by default. Send us a request if you want to activate it. After activation of the Modbus server, you are ready for commissioning.​​​​​​​

There are 2 types of nodes:

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Modbus Write - which is used for writing values to the Modbus registers. For example, when we need to send the actual state of a sensor to an external Building Management System.

Vertex modbus - which is used for reading values. For example, when we need to turn the lights on when the external Building Management System sends a command.

While designing the Modbus register map, remember about the following parameters:

• the number of groups that will be controlled via BMS

• the number of groups that will require feedback to BMS

• the value range that will be entered:

  • e.g. 0-1 for ON/OFF control

  • (0-100) – for smooth brightness control (%)

  • 2700-6500 – for color temperature control (K)

• The operating mode description:

  • ON/OFF

  • brightness level in %

  • color temperature in degrees K

There are 0-1000 free registers for the Analog Output Hold Registers function per one Vertex. Each Vertex (IP) has its own register pool.

Example of a correct layout of Modbus TCP registers