1.1 Product Description
Basic Features
- Up to 8-lift connectivity
- Lift cabin, shaft and machine room audio units
- Minimisation of interconnecting wiring
- Excellent acoustic features
- In-built back-up battery pack
- Easy control and programming – voice menu
- Checking call function
- Lift blocking option during connection failure
- Internal communication – triphony
- Telephone/PC-based programming
- USB port
- User message recording option
- Local dispatching option (Intercom)
- Fireman function
Basic Description
2N® LiftNet (LN) is a communication system similar to the intercom. The audio units are connected (through a pair of conductors) to a common bus, to which one central unit (CU) is connected. The CU controls the system operation and provides connection to the dispatching office. Up to 32 audio units can be connected to the bus.
Each audio unit is uniquely identified: by lift number 1 to 8 and position: shaft bottom, cabin interior, cabin roof and machine room. The machine room audio unit can be shared by multiple lifts.
The CU is supplied with 12V DC. It contains an easily replaceable back-up accumulator battery pack (4 AA Ni-MH cells in a holder). The CU is responsible for battery charging and status monitoring. It indicates the charging status, telephone line status and current communication by means of three colour LEDs. It is also equipped with a USB port to provide comfortable parameter setting, voice message recording and software upgrade.
System Block Diagram
Figure: Example of Connection of PSTN CU and 3 2N® LiftNet Audio Units
Figure: Example of CU and 2N® LiftNet Audio Units Local Dispatching Audio Unit Connection
Figure: Example of Fireman Connection in 2N® LiftNet