Installation

The DALI-2 Button Coupler is an in-wall device. It fits into a flush-mounted installation box behind the buttons it serves and measures 40.5 x 28 x 14.5 mm.

Connections

• Buttons: terminals T1, T2, T3 and T4, each switched against the shared COM terminal.
• DALI bus: the two DA terminals. Polarity does not matter, either wire can go to either terminal.

All terminals are spring type. They take 0.25 to 1.5 mm² solid or fine wire, or 0.2 to 0.5 mm² with a wire end ferrule. Strip 8 to 9 mm. Connect one wire per terminal.

Mounting and wiring

1. Wire the DALI bus to the two DA terminals.
2. Wire each button between its input terminal and COM.
3. Fit the coupler into the flush-mounted box behind the buttons.

Several couplers share one DALI line. Each sits on the same pair of bus wires as the control gear it operates, alongside the DALI power supply.

DALI line capacity

The DALI standard allows up to 64 control devices per DALI line, for example 64x AFD-B4. Each AFD-B4 uses one address for its 4 push-button instances, for a total of 256 push buttons. The same line also takes up to 64 control gear, such as the LED drivers of DALI lights.