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CBX-8R8 is a fully programmable BTL-listed BACnet Advanced Application Controller (B-AAC) that communicates on an RS-485 local area network and supports multi-protocol communications simultaneously including BACnet MS/TP and Modbus RTU.

CBX-8R8 provides 8 UniPuts™ with Relay and 8 Universal Inputs as well as support for up to three FLX (Field Level eXpansion) series extension modules providing up to 64 points of control.


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CBX-8R8 is designed for a wide range of applications for intelligent control of HVAC equipment, lighting control and electrical systems including metering applications.

Product Models

  UniPuts™ with Relay1 Universal Inputs Digital Inputs Modbus RTU
CBT-STAT Bus HOA Switch & Pot. 18 V Aux Power FLX
I/O Modules
CBX-8R8 8 8 0 4* 1 No  Yes   3
CBX-8R8-H 8 8 0 4* 1 Yes Yes  3
FLX-8R8 8 8 0 0 0 No Yes  -
FLX-8R8-H 8 8 0 0 0 Yes Yes  -
FLX-4R4 4 4 0 0 0 No Yes  -
FLX-4R4-H 4 4 0 0 0 Yes Yes  -
FLX-16DI 0 0 16 0 0 No Yes  -

Key Benefits

  • Cost Effective Solution
  • Quick & Easy Installation with Modular Hardware Design
  • Reduced Diagnostic Time
  • Reduced Time on-site
  • Efficient Post Installation Checks & Testing
  • Flexibility to Expand

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Quick & Easy Installation with Modular Hardware Design

  • Replace or Extend I/O points quickly and easily.
  • FLX Modules snap together without the need for the System Integrator to prepare special cabling. However, when necessary, a cable can be used to extend the FLX modules a total distance of 300 meters (1,000 feet) from the CBX controller.
  • I/O bus / power connection is achieved through a single plug connector, simplifying the installation process and eliminating the possibility of misconnection between components of a CBX system trunk.

Reduced Diagnostic Time

  • Tool free diagnostics to facilitate instant identification of wiring faults.
  • Status LEDs included for all I/O points instantaneously provide visual diagnostic and error status for each connected system point reducing problem solving time.

Reduce Time On-Site

Pre-configuration of the FLX expansion module via the FLX dip switch addressing facility:
  • Reduces on-site installation time
  • Simplifies setup and system checks
  • Reduces the skill level for hardware upgrade or expansion

Efficient Post Installation Checks and Testing

  • Manual over-ride of UniPuts™ enable easy configuration, quick commissioning and post installation testing without the need to connect to Engineering Centre. Over-ride of UniPuts™ can be undertaken through Engineering Centre or locally using the HOA facility where available. Hand/Off/Auto Local Override function (Available for FLX UniPuts™).

Flexibility to Expand

  • Flexibility to Expand up to 64 points of control with FLX-8R8 and FLX-8R8-H Field Level eXpansion modules.


Type STM32 ARM Cortex-M3 processor
System Memory 1MByte external SRAM + 16 Mbyte external flash (soldered to PCB not removable)
Supply Requirements 24 V AC ±20 % 50/60 Hz
Termination PCB mounted plug terminal connections
Conductor Area Max: AWG 12 (3.09 mm2) Min: AWG 22 (0.355 mm2)
Temperature & Humidity  32° to 122° F (0° to 50° C) / 0-90% RH non-condensing
EMC Immunity  EN 61326-1: 2013
EMC Emission  EN 61326-1: 2013, EN 61000-3-2: 2014, EN 61000-3-3: 2013
Size  6.5 x 3.55 x 2.25” (166 x 89.5 x 57 mm) excluding terminal plugs
Enclosure & Mounting  Injection-molded ABS / DIN Rail
(724) 733-2000
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