QCS-1212 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-1212 is a fully programmable, Native BACnet® Building Controller that communicates on a 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-1212 also supports an additional BACnet MS/TP SubLAN for VAV and other application controllers. It is designed for a wide-range of applications that have mid-sized I/O requirements. The SubLAN may be configured to support BACstats and other LINKnet I/O devices.


  •  Native BACnet firmware
  • BACnet MS/TP communications BACnet IP capability
  • BACnet over Ethernet capability Integrated housing
  • 12 Universal Inputs and 12 Universal Outputs
  • Fully programmable in GCL+
  • Application database and firmware can be flash loaded over the network
  • Supports Modbus® capability by flash loading in the field via hardware key
  • Hand/Off/Auto (HOA) switches with position feedback
  • Tri-color LEDs to indicate output status


The QCS-1212 controller is suitable for controlling equipment such as AHUs, boilers, chillers and a variety of HVAC control systems.

Because of its programming capability, the QCS-1212 can be used to create or modify GCL+ programs and BACnet objects for specific applications.


BACnet Device Profile
BACnet Building Controller (B-BC)

12 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

12 Universal Outputs (0-10 VDC, 8-bit), 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 / SELV

24 VAC 50/60 Hz @ 25 VA

16-bit processor
2 MB (16-megabit) flash memory
512 KB SRAM database memory
Real-time clock with lithium-ion battery and SRAM backup
CPU and SCAN status LED

Communication Ports
Twisted-pair Ethernet
(10-BaseT) @ 10 MB (optional),
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

BACnet MS/TP, max 99 devices or LINKnet @ 76800 bps, max 12 devices on LINKnet with no more than 2 DFM devices
Serial RS-232 BACnet PTP, 9600, 19200 or 38400 bps

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

10⅝ x 8⅛ x 2½ in. (27 x 20.5 x 6.4 cm) with housing

2 lb. (900 g) with housing



Order the QCS-1212 with the desired options according to the following product numbers:

QCS-1212 Controller and housing, MS/TP LAN, Ethernet LAN/WAN, HOA switches with feedback