16 Outputs relay box and floor security controller

Our Floor Secure Relay technology offers enhanced security for elevators by restricting access to specific floors to authorized individuals only.


  • Built-in Self-detection device to avoid hand-up.
  • Provide emergency mode contact to eliminates all floors access control.
  • Function with Chiyu door controller only, compatible with SEMAC-S3.
  • No limitation for user control, you can just use card number and group setting to control floor, that way will be much easier for system integration.
  • Built-in 16 relay Output. When there are over 16 floors, you can connect more BF-333 to extend the floor control number. You can connect 8 pcs of BF-333 to control 128 floors at the most.


  • Communication Interface: RS-485
  • Relay Output: 16 (1A /30V DC)
  • Emergency Input Contact: Yes, eliminate all of floor access control.
  • Watch Dog: System halt prevention
  • Operation Power: 9 ~ 24V DC
  • Rated Current: 800 mA
  • Operation Temperature: 0°C ~ 55°C
  • Dimension: 179 x 141 x 29 mm
  • Weight: 650 g


  • Web Server, supported by Chiyu Technology's SOMAC Central management software. Access Control and Time & Attendance. Features like anti-passback, user accession, group accession, door setup by verification methods
  • All products with 2 years warranty.

BF-333 Installation Manual

BF-333 Catalogue

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