BACnet Field Control Device

BACnet Advanced Application Controller

DACB - BACnet Field Control Device -  BACnet Advanced Application Controller


DACB is a standalone BACnet B-AAC class programmable controller. It is designed for monitor and control building electromechanical device, large AHU, clean room, fume hood, large-scale end device control. It uses 32-bit microprocessor core, communication speed up to 76,800 bps, transmission distance up to 1,200 meter. DACB doesn’t have I/O point. It must be configured EIM expansion I/O modules then it can work. Up to 12 EIM modules can be connected to it.

Total number of I/O points can be selected by using different combination of EIM. In addition it has an MSnet port can connect to an external LCD control panel to make user operation and control easily at job site. DACB conforms international BACnet MS/TP communication protocol and fully compatible with any BACnet system. It is absolutely the best product for your building.


  • Conforms to ASHRAE and ISO16484-1 defined BACnet AAC standard communication protocol, compatible with BACnet system.
  • An MS/TP(Master-Slave/Token-Passing) communication interface, with Peer to Peer function can read and write other DDC’s object, may issue a read (DS-RP-A/DS-RPM-A) and write (DS-WP-A) BACnet object properties function.
  • An MSnet communication interface can connect a MST20V, MST20S, DSP20U control panel or a MODBUS RTU device.
  • An EIMnet communication interface can connect up to 12 EIM I/O expansion modules.
  • User’s control program can be downloaded, edited and saved in flash memory of the controller.   
  • Carry out calculations such as proportional, integral, differential, floating, logic, arithmetic and etc.
  • 150 Binary Value(BV) and 150 Analog Value(AV) points, the analog value adopts high precision floating-point calculation.
  • Standard floating point operation for analog point. Its large value range save additional work for ratio multiplication.
  • Priority control array by 16 for all BO, AO and BV.
  • Provide power failure backup function for all AI/BO/AO/BV/AV values keep in FRAM for at least 10 years.
  • Real-time clock, 2 Calendars, 12 Schedules, 4 Notification Class, 20 Event Enrollments standard BACnet object. Schedules and event enrollments support external object access function.
  • Slide track design for space-saving and easy installation.

View more detailed specifications (PDF). View PDF