QCA-1606 / QCA-1606E 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-1606 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 (QCA-1606E) or an RS-485 LAN using the BACnet MS/TP protocol (QCA-1606). It is designed for a wide-range of applications that have small local I/O requirements.


  • Native BACnet firmware

  • Fully programmable in GCL+

  • Maintenance free super capacitor for real-time clock and SRAM backup on QCA-1606E

  • Supports 6 network sensors for room sensing and control or 2 Field Modules for I/O expansion
  • 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-1606 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-1606 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


BACnet Device Profile
BACnet Advanced Application Controller


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 connectors

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

76800 bps, max
6 devices with no more than 2 DFM devices

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

8½ x 4⅟4 x 115/16 in. (21.8 x 10.7 x 4.9 cm) with housing

0.80 lb. (360 g) with housing


C-UL Listed
BTL Listed
UL 916 Listed
UL 864 Listed for UL 864 product numbers

Subject to change without notice.


Order the QCA-1606 with the desired options according to the following product numbers:

  • QCA-1606 Quest Application Controller 6 BOs, 6 inputs
  • QCA-1606E 6 BOs, 6 inputs, Ethernet
  • QCA-1606-UL864-340 6 BOs, 6 inputs, UL 864 Listed

Support Documents