· Electronically encoded with only one ID; online addressing by controller or addressing by encoder. 

         .  Automatic log-in, convenient installation and debugging. 

        · Unique rotary structure, convenient installation.

        · Special key for reset.

        · Built-in interphone socket with a “Phone” indicator.

        · Supports the “digital bus” communication protocol.

· Working temperature: －10℃ ～ +50 ℃

· Working voltage: DC24V Pulsating voltage

   · Standby current: ＜0.35mA

   · Alarming current: ＜0.85mA· Protection level of casing: IP30

   · Working humidity: ≤95% RH (No condensation of moisture)

   · Interior key contact spot volume: DC24V/0.1A

   · Bus length: ≤2000m

   · Wiring system: Two-wire bus, non-polarized