QCA-403 Application Controller

COSYS Building Controls


Our COSYS Application and System Controls work along with our enterprise software platform OspreyFMS to provide a meaningful context.

The QCA-6411 Application Controller is a fully programmable, Native BACnet® Advanced Application Controller that either communicates on Twisted-Pair Ethernet 10-BaseT using BACnet IP. It is designed for a wide-range of applications that have small local I/O requirements. It also supports BACstat® and other Delta LINKnet devices.


  • Fully programmable in GCL+
  • Supports 4 BACstat network sensors on LINKnet for room sensing and control
  • Firmware upgrade and database load/save over the network
  • Optional field upgrade to Modbus® RTU with hardware key
  • Service port
  • Screw or DIN rail mountable
  • LED indicator for each output, power, CPU and SCAN status


The QCA-403 is suitable for controlling various packaged units and equipment with small I/O requirements such as Fan Coil units, Unit Ventilators and Heat Pumps. The fully programmable QCA-403 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


BACnet Device Profile
BACnet Advanced Application Controller (B-AAC)

3 Universal Inputs (10-bit) supporting:
0-5 VDC
0-10 VDC
10 kΩ Thermistor
Dry Contact (using 10 kΩ Thermistor jumper setting)
4-20 mA

4 Binary TRIAC Outputs (jumper configured for internal or external power)

Device Addressing
Set via DIP switches or software setup

Removable screw-type terminal connectors

Wiring Class
Class 2 / SELV

24 VAC 50/60 Hz @ 6 VA, 50 VA max with fully-loaded Binary Outputs

16-bit processor
1 MB flash memory
127 KB SRAM memory for database

Communications Ports
RS-485 NET1
BACnet MS/TP up to 76800 bps, max of 99 devices per port

RS-485 NET2
LINKnet up to 76800 bps, max 4 devices on LINKnet, with no more than 2 DFM devices
Optional Modbus up to 38400 bps,
max 5 devices

32° to 131°F (0° to 55°C)
10 to 90% RH (non-condensing)

7 ⅝ x 4 x 1 ⅞ in. (19.2 x 10.2 x 4.8 cm)
with housing

0.551 lb. (250 g) with housing



Order the QCA-403 according to the following product number:

QCA-403 Application Controller 3 universal inputs, 4 binary outputs