QCS-1616 System Controller

COSYS Building Controls


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

The QCS-1616 is a fully programmable, Native BACnet® Building Controller that communicates on Twisted-Pair Ethernet 10-BaseT using BACnet IP and BACnet over Ethernet, or on an RS-485 LAN using the BACnet MS/TP protocol.
The QCS-1616 also supports an additional BACnet MS/TP SubLAN for VAV and other application controllers. The SubLAN may be configured to support BACstat® and other LINKnet I/O devices. This controller is designed for a wide-range of applications that have mid-sized I/O requirements.


  • Native BACnet firmware
  • BACnet MS/TP communications
  • BACnet IP and BACnet over Ethernet capabilities
  • Fully programmable in GCL+
  • Controller firmware and application database can be flash loaded over the network
  • Optional field upgrade to Modbus® RTU with hardware key
  • Hand/Off/Auto (HOA) switches with position feedback
  • LED indicator for power, output, CPU and SCAN status


The QCS-1616 is suitable for controlling equipment such as AHUs, Boilers, Chillers and a variety of HVAC control systems.

The fully programmable QCS-1616 can be tailored to specific applications by creating and modifying BACnet objects and GCL+ programs.


BACnet Device Profile
BACnet Building Controller (B-BC)

16 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

16 Analog Outputs (0-10 VDC), software configured as binary or analog

Device Addressing
Set via DIP switches and jumpers, or software setup

Removable screw-type terminal connectors

Wiring Class
Class 2 

24 VAC 50/60 Hz @ 30 VA

16-bit processor
2 MB (16-megabit) flash memory 319 KB SRAM memory for database Real-time clock with lithium battery and SRAM backup

Communications Ports
Ethernet (10-BaseT)
BACnet IP, BACnet over Ethernet
2 RS-485 NET1, NET2 supporting:

BACnet MS/TP up to 76800 bps, max 99 devices per port
LINKnet up to 76800 bps, max 12 devices on LINKnet with no more than 2  DFM devices (1 port only)
Optional Modbus up to 68400 bps, max 5 devices (1 port only)

Serial RS-232
BACnet PTP, up to 38400 bps

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

12 x 8⅛ x 2½ in. (30.6 x 20.5 x 6.4 cm) with housing

2.20 lbs. (1 kg) with housing



Order the QCS-1616  with the desired options according to the following product numbers:

QCS-1616 Controller and housing, BACnet MS/TP LAN, BACnet over Ethernet LAN, HOA switches with feedback