Overview
The Pitagora 4.0 System offers two different wiring solutions to connect the landing pushbuttons to the control panel:
Serial Wiring
Based on a single serial connection line, interspersed with shaft units (BDU). This solution is most suitable for new installations and complete modernizations, especially for buildings with a higher number of floors, typically above 6-8.
Parallel Wiring
Based on a parallel board in the control panel with direct and parallel connections to each floor of the system. This solution is typically adopted in partial modernizations of residential installations, especially when it is required to keep the existing pushbuttons. It can also be advantageous for new installations with a limited number of floors.
Serial wiring
The serial wiring solution uses a CAN BUS signal to manage all signals between the controller and the floors, both for call buttons and for displays and accessories. The basic schematic includes:
- A 4p miniwago cable (10m, 15m, or 20m) between the control panel and the first shaft BDU.
For each floor:
- A shaft BDU for each floor of the system
- A 4p “BDU line” minifit cable of 3,5m / 5m / 10m (depending on floor height) for connection to the BDU on the next floor.
- A set of cables (see JST cable section for pushbuttons) between the BDU and the landing pushbutton / floor indicator
Serial line connection
Q) Controller
E) Connection to the next BDU
The last BDU of the serial line must be bridged as shown in the figure.
Connecting the BDU serial interface to the call push-buttons
The additional optional BEEP interface board is required in the case of call button contact modules that do not have an integrated BEEP.
Connecting the BDU serial interface to the position indicator
The BDU module can be connected to the DMG displays of the following series
- Banksy
- Raffaello
- Giotto
Connecting the BDU serial interface to the key contacts
The two inputs IN1 and IN2 are programmable inputs from the controller and are typically used for key switch contacts associated with different functions.
Input IN1
- Call Disable (Default): Open contact = call enabled; closed contact = call disabled.
- Priority LOP function.
- Penthouse+Guest function: N.O. key switch contact.
Input IN2
- Out-of-Service Key Input (Default): This input can be used as a replacement for the HS signal on the controller terminal block.
Connecting the BDU serial interface to the signals
The two outputs IN1 and IN2 are programmable outputs for signals, and they are associated with preset sets of parallel outputs.
(See the table below)
F) The “Out of Service” signal is not programmable and is not available in the case of a duplex-light system.
| OUT 1 | OUT 2 |
|---|---|
| Present | Out os service |
| Up arrow | Down arrow |
| Present | Incoming |
| Present |
Connecting the BDU serial interface to the Firefighters key
Connecting the BDU serial interface to the Sensors
G) Fire contact
H) Doors contact
I) GND
