QCA-606 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-606 is a fully programmable, Native BACnet® Advanced Application
Controller that either communicates on Twisted-Pair Ethernet 10-BaseT using BACnet
IP and BACnet over Ethernet (optional) or 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 BACstat® network sensors and other LINKnet devices.


  • Native BACnet firmware
  • Fully programmable in GCL+
  • Maintenance free super capacitor for real-time clock and SRAM backup on QCA-606
  • Supports 6 BACstat network sensors on LINKnet for room sensing and control
  • 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
  • LED indicator for each output, power, CPU and SCAN status


The QCA-606 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-606 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


BACnet Device Profile
BACnet Advanced Application Controller (B-AAC)
6 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
6 Binary TRIAC Outputs (jumper configured for internal or external power)
Device Addressing
Software addressed
Removable screw-type terminal
Wiring Class
Class 2 /SELV
24 VAC 50/60 Hz @ 8 VA, 80 VA with fully-loaded TRIAC Outputs
(non-Ethernet version)
16-bit processor
1 MB Flash memory
127 KB SRAM memory for database
(Ethernet version)
16-bit processor
2 MB Flash memory
319 KB SRAM memory for database
Super Capacitor for 72-hour backup of
real-time clock and SRAM
Communications Ports
Twisted-Pair Ethernet
(10-BaseT) @ 10 MB, BACnet IP, BACnet over Ethernet
Main LAN (NET1)
BACnet MS/TP @ 9600, 19200, 38400 or
76800 bps (default), max of 99 devices
per BACnet MS/TP network
Delta LINKnet @ 76800 bps, max
6 devices on LINKnet, with no more than
2 DFM devices
0° to 55°C (32° to 131°F)
10 to 90% RH (non-condensing)
21.8 x 10.7 x 4.9 cm (8½ x 4 ⅟4 x 1 1516 in.) with housing
360 g (0.80 lb.) with housing
EAC (QCA-606)


Order the QCA-606 with the desired options according to the following product numbers:

QCA-606 Application Controller 6 inputs,  6 BOs

QCA-606 Application Controller 6 inputs, 6 BOs, Ethernet