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BACnet Communication Driver

BACnet Communication Driver is intended for data connection between Reliance's runtime software and devices communicating via the BACnet/IP protocol (ASHRAE Building Automation and Control Networks protocol). The driver implements basic services for reading and writing data.



Supported services

  • ReadPropertyMultiple
  • WriteProperty
  • TimeSynchronization


Supported objects

  • Analog Input
  • Analog Output
  • Analog Value
  • Binary Input
  • Binary Output
  • Binary Value
  • Multi-state Input
  • Multi-state Output
  • Multi-state Value
  • Loop
  • Device
  • Schedule


Starting up the driver

The communication driver is a DLL loaded into memory by the Reliance 4 Driver Server program, which can be launched either as a Windows service at Windows startup or as a standard application at the start of a visualization project. Information required to make a connection with devices is read from the visualization project. After reading this information, communication to all connected devices is activated.



The supported properties of BACnet objects are:

Object-identifier, object-name, object-type, present-value, description, device-type, status-flags, event-state, reliability, out-of-service, update-interval, units, min-pres-value, max-pres-value, resolution, relinguish-default, cov-increment, time-delay, notification-class, high-limit, low-limit, deadband, limit-enable, event-enable, acked-transitions, notify-type, profile-name, output-units, controlled-varible-value, controlled-variable-units, setpoint, action, proportional-constant, proportional-constant-units, integral-constant, integral-constant-units, derivative-constant, derivative-constant-units, bias, maximum-output, minimum-output, priority-for-writing, number-of-states, polarity, inactive-text, active-text, change-of-state-time, change-of-state-count, time-of-state-count-reset, elapsed-active-time, time-of-active-time-reset, minimum-off-time, minimum-on-time, feedback-value, system-status, vendor-name, vendor-identifier, model-name, firmware-revision, application-software-version, location, protocol-version, protocol-revision, protocol-services-supported, protocol-object-type-supported, object-list.


The communication driver does not support segmentation.


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