QCA-1304 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-1304 is a fully programmable, Native BACnet® Advanced Application Controller that communicates on Twisted-Pair Ethernet 10-BaseT using BACnet IP and BACnet over Ethernet (QCA-1304E) or an RS-485 LAN using the BACnet MS/TP protocol (QCA-1304). It is designed for a wide-range of applications that have small local I/O requirements.


  • Supports 4 BACstat network sensors for room sensing and control or 2 Field Modules for I/O expansion
  • 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
  • Fully programmable in GCL+


The QCA-1304 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 QCA-1304 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 and jumpers, or software setup

Removable screw-type terminal connectors

Wiring Class
Class 2 / SELV

24 VAC 50/60 Hz @ 14 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
Up to 76800 bps, max
12 devices with no more than 2 DFM devices
Optional Modbus up to 38400 bps,
max 5 devices

32° to 131°C 0° to 56°F)
10 to 90% RH (non-condensing)

7⅝ x 4 x 1⅞ in. (19.2 x 10.2 x 4.8 cm) with housing

0.551 lb. (250 g) with housing


C-UL Listed
UL 916 Listed
BTL Listed

Specifications subject to change without notice.


Order the QCA-1304 according to the following product number:
QCA-1304 Application Controller 3 universal inputs, 4 binary outputs