5Wiring schematic diagramSet up correctly according to the following wiring schematic diagram and "Wire type and length".R For information, such as order numbers, about optional devices that can be connected to, refer to the"Additional/replacement accessories" section in the Operating Instructions.A Power supply*1 When you use an additional doorphone, the maximum number of the electric locks that can beconnected to the doorphone depends on the type of doorphone. Consult your dealer for furtherinformation.For VL-V554 users:– Make sure to only connect electric door locks to the S1/S2 terminals of the doorphones.*2 Connection devices for option input (A contact) can be used when a VL-V900 and VL-V700 seriesVideo Intercom System for Apartment Complexes is used.– Make sure to connect emergency terminals to the IN1/IN2 terminals.– Make sure to connect doorbells to the IN3/IN4 terminals. A doorbell and doorphone 2 cannot beused together.*3 VL-SV72/VL-MV72 onlyDOORPHONE 1 DOORPHONE 2ElectriclockElectriclockNP: Non-polarisedMAIN MONITORD1D2D3D4Ml-1Ml-2MO-1MO-2MO-3MO-4MO-5MO-6IN1IN2IN3IN4P1P212341920212256789101112131415161718S1S2S3S4Ml-1Ml-256Ml-1Ml-256Ml-1Ml-256EXTENSIONMONITOR 1EXTENSIONMONITOR 2EXTENSIONMONITOR 3Connection devicefor option Input(A contact) *2Terminal box(4-conductorwiring)PBX1 1NPNPNPNPNPNPNPNPNPNPYou can also connect anoptional lobby station or VideoIntercom System for ApartmentComplexes. (See page 7.)*1 *1POWER SUPPLY UNIT24 V DCNP*3