BACnet Field Control Device

BACnet Advanced Application VAV Controller

DACV403B is a BACnet B-AAC class programmable VAV controller.


DACV403B is a BACnet B-AAC class programmable VAV controller. It has an air pressure sensor to control a single duct VAV box. It also can control dual duct VAV box by using EIM module on the EIMnet port. It uses 32-bit microprocessor core, communication speed up to 76,800 bps, transmission distance up to 1,200 meter. DACV403B has 4 Universal Inputs(UI) and 3 Analog Outputs(AO).

In addition it has EIMnet port can connect up to 4 EIM series of expansion modules, allowing you to expand in response to needs of various points. Another MSnet port can connect to an external LCD control panel to make user operation and control easily at job site. DACV403B conforms to 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.
  • A 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 4 EIM I/O expansion modules.
  • High precision air pressure differential sensor, sense on either direction, measure at low air flow rate, fully IC packed to prevent dust pollution.
  • Calibrate function in BACsoft for advantage of adjustment at site when air flow is stable.
  • 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.
  • 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 and BV points.
  • Provide power failure backup function for all AI/BO/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.

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