QCA-6411 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 and BACnet over Ethernet (QCA-1146E) or an RS-485 LAN using the BACnet MS/TP protocol (DAC-1146). It is designed for a wide-range of applications that have medium local I/O requirements. It also supports BACstat® and other Delta LINKnet devices.


  • Fully programmable in GCL+
  • Super Capacitor for real-time clock and SRAM backup which requires no maintenance (DAC-1146E)
  • Supports 10 BACstat network sensors on LINKnet for room sensing and control
  • Actuator power terminal (24 VAC) for each analog output (can be powered internally or from an auxiliary transformer)
  • 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-6411 is suitable for controlling various packaged units and equipment with medium I/O requirements such as small air handling units, boilers, and chillers. The fully programmable DAC-1146 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


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

11 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)
4 Analog Outputs (0-10 VDC)

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, 86 VA with fully-loaded Binary Outputs

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

16-bit processor
2 MB flash memory
319 KB SRAM memory for database
Real-time clock
Super Capacitor for 72-hour backup of realtime clock and SRAM

Communications Ports
Main LAN
Ethernet (10-BaseT)
BACnet IP, BACnet over Ethernet
(DAC-1146E only)
RS-485 NET1
BACnet MS/TP up to 76800 bps, max
99 devices per port


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

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

26.2 x 10.7 x 4.9 cm
(10⅜ x 4¼ x 115/16 in.) with housing

428 g (0.944 lb.) with housing

C-UL Listed
UL 916 Listed
BTL Liste

BACstat is a registered trademark of Delta Controls Inc.

BACnet is a registered trademark of American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

Updated July 31 2018


Order the QCA-6411 with the desired options according to the following product numbers:

QCA-6411 Application Controller 11 inputs, 4 AOs, 6 BOs, MS/TP

QCA-6411E Application Controller 11 inputs, 4 AOs, 6 BOs, Ethernet

Note: When using Ethernet, MS/TP protocol is not available (RS-485 ports can be used for LINKnet and/or special interfaces only).