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To design the system, prepare a schematic diagram of connecting the Vertex with lighting luminaires and other DALI devices (sensors and panels). First, address DALI devices - assign the devices to the individual Vertex buses (ports). The order in which devices are connected on the bus does not matter.

E2D design guidelines:

  1. DALI bus length

  2. Maximum current limit

  3. Number of addresses limit

  4. Number of sensors and panels on one bus

  5. DALI bus topology

DALI bus length

The maximum distance between the last devices and the Vertex is 300 m.

Vertex has 3 DALI ports and each port has 2 inputs. So put Vertex in the middle of the device's line to double the distance between them to 600 m.

Maximum current limit

Up to 64 DALI devices can be connected to each port (55 per port is recommended). The allowed current must be not exceeded.

For example, the project includes 42 luminaires and 8 sensors on one bus. The allowed current for the Vertex 3 is 230 mA* per one port. The current consumption for the luminaires is 2 mA and for the selected sensors maximum current consumption is 18 mA. The total power consumption of these devices is 228 mA. It is less than the permissible limit on the bus, so it’s ok.

*The allowed current for the Vertex 3 is 230 mA per one port but for the Vertex 2 there is 180 mA.

Number of addresses limit

Each DALI port has 64 DALI addresses. Usually, one DALI device takes up 1 DALI address. Up to 64 (55 per port is recommended) devices can be connected to one port. But there are some luminaires that take up more than one DALI address and relay units that can take up 4 or even 8 addresses. Information about the total number of DALI drivers is in the luminaire datasheet.

Count the addresses first, not the individual devices!

Number of sensors and panels on one bus

Sensors and panels have another limit. Up to 8 of those devices per one DALI bus can be connected. This restriction does not apply to luminaires. There can be both sensors and panels on one bus, and of course luminaires. Remember that Vertex has 3 DALI ports, so a total of 24 sensors and panels per one Vertex can be connected. Do not exceed the recommended total number of devices on one bus (55).

This restriction applies to both Vertex 2 and Vertex 3.

DALI bus topology

Remember that looping of the bus is prohibited and it will cause a lack of communication. Use only the permitted DALI bus topologies described below.

The allowed bus topologies are tree, star and line.

DALI bus looping is prohibited.

Good practices:

  • Do not fill entire buses. It is good to leave a reserve. No more than 55 devices on one bus.

  • If possible, distribute devices evenly over the buses (not all on one).

  • If possible, give luminaires from one group on the same bus. This will make subsequent programming easier.

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