BACnet Programmable Controller

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  • 32-bit ARM7 processor
  • 100Mb Ethernet and Optional WiFi
  • BACnet communication
  • System Bus for ASI or BACnet MSTP communication
  • Local Bus for ASI and/or Modbus Master RTU
  • Compatible with ASI WebLink & ASI Data Server products
  • USB Device Service Port
  • 8 Universal Inputs
  • 8 Binary Relay Output
  • 4 Analog Outputs


The ASIC/3-9520 Programmable System Controller represents our newest generation of DDC Controls. Designed to be backwards compatible with ASIC/2 Programmable controllers, the 9520 also offers expanded communication capability including USB, BACnet, Ethernet and Wireless.

The ASIC/3-9520 DDC Controller provides energy management and control of a wide range of building automation systems including:

  • Air Handlers
  • Chillers
  • Cooling Towers
  • Boilers
  • Pumps
  • Lighting

Applications range from autonomous control of retail stores, branch banks, and telephone company buildings to networked control of very large buildings. It has a switching power supply for AC operation and flash memory for program and data storage.

The controller is easily configured using ASI Visual Expert configuration software that links ready-made objects including scheduling, logic, PID control, alarming, optimum start, trending, run-time accumulation, and electrical demand management.

The ASIC/3 has an on-board battery-backed calendar clock, and data is retained through power loss. The system bus is used to network multiple ASIC/3 and ASIC/2 controllers, or BACnet MS/TP. No central system is needed to supervise the controller. The local bus can also support Modbus Master RTU. Red and green LEDs indicate the controller’s receive and transmit communications.

The ASIC/3 can operate as part of a larger communicating control network. The ASIC/3 offers Ethernet communication and wired connection (or optional WiFi module). The ASIC/3 also features a full-speed 12 Mbps USB Device connection. The RS-485 connections support baud rates up to 57,600 bps, and standard BACnet MSTP baud rates up to 76,800 bps are also supported.

The controller can send notify messages to a computer running ASI Weblink software. Temperatures, setpoints, and other controller data may be easily reported to ASI WebLink or other OPC client software.

The eight 24 Vac relay outputs are ideal for driving contractors and starters. The four analog outputs are used for modulated actuators, electronic-pneumatic transducers, variable speed drives and other analog signal devices. The eight universal inputs may be used for counting pulses, for reading thermistors and contact closures directly, and for reading 4 to 20 mA, 0 to 5 Vdc or 1 to 5 Vdc input signals.