The DAC-633 is a fully programmable, Native BACnet™ Advanced Application Controller that communicates on Twisted-Pair Ethernet 10-BaseT using BACnet IP and BACnet over Ethernet, or on an RS-485 LAN using the BACnet MS/TP protocol. It is designed for a wide-range of applications that have small local I/O requirements. It also supports BACstats and other Delta LINKnet devices.


The DAC-633 is suitable for controlling various packaged units and equipment with small I/O requirements such as Fan Coil units, Unit Ventilators, Heat Pumps, and small Boilers or Chillers. The fully programmable DAC-633 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


  • Native BACnet firmware
  • Fully programmable in GCL+
  • BACnet MS/TP communications (DAC- 633), BACnet/IP and BACnet Ethernet (DAC-633E)
  • Super Capacitor for real-time clock and SRAM backup (requires no maintenance) on DAC-633E
  • Supports 6 BACstat network sensors on LINKnet for room sensing and control or 2 Delta Field Modules on LINKnet for I/O expansion
  • Actuator power terminal (24VAC) for each analog output (can be powered internally or from an auxiliary transformer)
  • Firmware upgrade and database load/ save over the network
  • Supports Modbus capability via flash loading in the field
  • Service port
  • Screw or DIN rail mountable

BACnet Device Profile

BACnet Advanced Application Controller (B-AAC)


6 Universal inputs - 10 bit (supporting 0-5v, 0-10v, 10kΩ, 4-20mA)


3 Binary TRIAC outputs (jumper configured for internal or external power)

3 Analog outputs (0-10v)

LED status indication of each output



32-bit processor

1 MB Flash memory

127 KB SRAM memory for database

LED indication of CPU and SCAN status


32-bit processor

2 MB Flash memory

319 KB SRAM memory for database

LED indication of CPU and SCAN status

Real-time clock

Super Capacitor for 72-hour backup of realtime clock and SRAM

Device Addressing

Set via DIP switch and jumpers, or software setup

Communications Ports

Twisted Pair Ethernet (10-BaseT) @ 10MB, BACnet IP, BACnet over Ethernet

RS-485 NET1

BACnet MS/TP @ 9600, 19200, 38400 or 76800 bps (default) (maximum of 99 devices per BACnet MS/TP segment)

RS-485 NET2

Delta LINKnet @ 76800 bps (maximum 6 devices on LINKnet, with no more than 2 DFM devices)


Removable screw-type terminal connectors

Wiring Class

Class 2 / SELV


24 VAC

12VA, 48VA with BOs fully-loaded


32° to 131°F (0° to 55°C)

10 - 90% RH (non-condensing)


81⁄2 x 41/4 x 115⁄16 in. (21.8 x 10.7 x 4.9 cm) with housing

0.80 lb. (360 g) with housing






UL 916


UL864 (DAC-633-UL864 only

  • MS/TP Application Controllers (DAC)