ABB CBV-2U4-3T User manual

—
USER GUIDE
MAN0139 rev 14
CBV-2U4-3T(-N)

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Style conventions used in this document:
UI Text: Text that represents elements of the UI such as button names, menu
options etc. is presented with a grey background and border, in Tahoma
font which is traditionally used in Windows UIs. For example:
Ok
Standard Terms (Jargon): Text that is not English Language but instead refers to
industry standard concepts such as Strategy, BACnet, or Analog Input is
represents in slightly condensed font. For example:
BACnet
Code: Text that represents File paths, Code snippets or text file configuration
settings is presented in fixed-width font, with a grey background and
border. For example:
$config_file = c:\CYLON\settings\config.txt
Parameter values: Text that represents values to be entered into UI fields or
displayed in dialogs is represented in fixed-width font with a shaded
background. For example
10°C
Product Names: Text that represents a product name is represented in bold
colored text. For example
INTEGRA™
Company Brand names: Brands that are not product names are represented by
bold slightly compressed text:
ABB Active Energy
PC Keyboard keys: Text representing an instruction to press a particular key on
the keyboard is enclosed in square brackets and in bold font. For example:
[Ctrl]+[1]

table of contents
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1GETTING STARTED
How to use this manual.................................................................................................................................... 6
CBV-2U4-3T(-N) .................................................................................................................................................. 6
Physical specifications...................................................................................................................................... 6
Environmental Specifications......................................................................................................................... 6
Supporting Software ........................................................................................................................................ 6
Supporting files .................................................................................................................................................. 6
2INSTALLATION OVERVIEW
Preparing to install the CBV-2U4-3T(-N) .......................................................... 7
Environmental and Electrical Requirements ...............................................................................................7
Unpacking the CBV-2U4-3T(-N) ......................................................................................................................7
Installation of CBV-2U4-3T(-N) .......................................................................... 7
Physical Installation of controller ...................................................................................................................7
Configuring the CBV-2U4-3T(-N) for BACnet communications.................. 18
Configuring the CBV-2U4-3T(-N) controller....................................................21
Setting CBV-2U4-3T(-N) BACnet Commissioning Configuration Codes in CXproᴴᴰ.....................21
Options ............................................................................................................................................................... 22
3CBV-2U4-3T(-N) CONTROL SEQUENCES
CBV-2U4-3T(-N) Control sequences.................................................................31
VAV Cooling only No Fan....................................................................................31
Temperature Control .......................................................................................................................................31
Input / Output Points ......................................................................................................................................31
VAV Cooling only Single Speed Fan................................................................. 32
Temperature Control ...................................................................................................................................... 32
Series Single Speed Fan ................................................................................................................................. 32
Input / Output Points ..................................................................................................................................... 32
VAV Cooling only Variable Speed Fan ............................................................. 33
Temperature Control ...................................................................................................................................... 33
Series Variable Speed Fan ............................................................................................................................. 33
Input / Output Points ..................................................................................................................................... 33
VAV One to Three Stage Electric Reheat No Fan...........................................34
Temperature Control ......................................................................................................................................34
Input / Output Points ..................................................................................................................................... 34
VAV One to Two Stage Electric Reheat Single Speed Fan ........................... 35
Temperature Control ...................................................................................................................................... 35
Fan Control......................................................................................................................................................... 35
Input / Output Points ..................................................................................................................................... 35
VAV One to Three Stage Electric Reheat Variable Speed Fan ..................... 36
Temperature Control ...................................................................................................................................... 36
Fan Control......................................................................................................................................................... 36
VAV Modulating Hot Water Reheat No Fan.................................................... 37
Temperature Control ...................................................................................................................................... 37
VAV Modulating Hot Water Reheat Single Speed Fan.................................. 38
Temperature Control ......................................................................................................................................38
Fan Control.........................................................................................................................................................38
Input / Output Points ..................................................................................................................................... 39
VAV Modulating Hot Water Reheat Variable Speed Fan ..............................40

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Temperature Control ......................................................................................................................................40
Fan Control.........................................................................................................................................................40
Input / Output Points .....................................................................................................................................40
4CONTROL SEQUENCE OVERVIEW
Occupancy States and Mode Commands................................................................................................. 42
Temperature Control ...................................................................................................................................... 42
Primary Air State and Damper Control ......................................................................................................43
Heating Control ................................................................................................................................................43
Fan Control.........................................................................................................................................................43
Occupancy States and Mode Commands ......................................................44
Occupancy State Command .........................................................................................................................44
Primary Air State Command .........................................................................................................................44
Standby State of Operation..........................................................................................................................45
Primary Air Mode..............................................................................................................................................45
Load Shed Enable ............................................................................................................................................ 45
Fire Stop Command ........................................................................................................................................45
Purge Command ..............................................................................................................................................46
Writing the Command Mode to the CBV-2U4-3T(-N)............................................................................46
BACnet communications status and Stand-Alone operation............................................................. 47
Temperature Control.........................................................................................48
Control Modes...................................................................................................................................................48
Cooling and Heating Offsets ........................................................................................................................48
Zone Temperature Setpoints .......................................................................................................................48
Setpoint Modifiers ...........................................................................................................................................49
ZATContrlModeEnumeration (A190) RO ...................................................................................................49
Zone Temperature Alarms.............................................................................................................................49
Primary Air Damper Control .............................................................................50
Primary Airflow..................................................................................................................................................50
Primary Air Setpoint Management..............................................................................................................50
Test and Balance .............................................................................................................................................. 53
Heating Control.................................................................................................. 55
Terminal Unit Heat........................................................................................................................................... 55
Baseboard Heat................................................................................................................................................ 55
Heat Order.......................................................................................................................................................... 56
Digital Output Direct/Reverse Action ........................................................................................................56
Digital Output Display Position ................................................................................................................... 56
Analog Output Range Options.....................................................................................................................56
Analog Output Direct/Reverse Action ....................................................................................................... 57
Analog Output Display Position................................................................................................................... 57
Fan Control ......................................................................................................... 58
Parallel Single Speed Fan ............................................................................................................................... 58
Series Single Speed Fan ................................................................................................................................. 58
Variable Speed Fan .......................................................................................................................................... 59
Parallel Variable Speed Fan ...........................................................................................................................59
Series Variable Speed Fan .............................................................................................................................60
APPENDIX : LIST OF CBV-2U4-3T(-N) POINTS
Hardware Points (I/O)....................................................................................... 61
Analog...................................................................................................................................................................61
Digital....................................................................................................................................................................61
Analog Values ..................................................................................................... 62
Binary Values ......................................................................................................68

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APPENDIX: LIST OF DIP SWITCH SETTINGS

CBV-2U4-3T(-N) | Getting Started
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1 Getting Started
HOW TO USE THIS MANUAL
The CBV-2U4-3T(-N) manual provides users with the information needed to install and configure the
controller for all the various application specific requirements.
CBV-2U4-3T(-N)
The CBV-2U4-3T(-N) is a configurable BACnet MS/TP device designed to be used within a BACnet system to
include existing eBuilding systems. The CBV-2U4-3T(-N) is designed to control a wide variety of VAV box
types used in commercial HVAC installations. The controller comes preloaded with a strategy that will control
most VAV applications; however, it is possible to load a custom strategy or to modify the preloaded strategy
to meet any application-specific needs.
PHYSICAL SPECIFICATIONS
Size
(excluding terminal plugs)
8.3 x 5.12 x 2.36”
(210 x 130 x 60 mm)
Enclosure
Injection molded ABS
Mounting
DIN rail
Airflow Sensor Connection
Use rubber hose suitable for a 0.2” (5.1 mm) O.D. nozzle
ENVIRONMENTAL SPECIFICATIONS
Ambient Temperature
32-122F (0- 50C) ambient.
Ambient Humidity
0% - 90% RH non-condensing
EMC Immunity
EN 55024, 2010
EMC Emission
EN 55022, 2010 Class A
Approvals
UL Listed (CDN & US) UL916 Energy Management Equipment - File No.
E176435
SUPPORTING SOFTWARE
To commission the controller, it is recommended to use CXproᴴᴰ software, ABB FusionAir Smart Sensors or
CBT-STAT devices.
SUPPORTING FILES
All files needed for configuring the CBV-2U4-3T(-N) are available from the ABB Cylon Community Toolbox
https://abbcommunity.com/

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2 Installation Overview
PREPARING TO INSTALL THE CBV-2U4-3T(-N)
This section describes how to unpack the unit and how to prepare the site for installation of the CBV-2U4-
3T(-N). In order to ensure reliable operation of the controller, the installation site should meet the
requirements listed in this section.
ENVIRONMENTAL AND ELECTRICAL REQUIREMENTS
The controller’s immediate environment must meet the following specifications.
Supply Voltage: 24 V AC, 50/60Hz
Note: One side of the 24 volts transformer must be grounded; refer to Connecting Power to the on page 10
for more information.
Temperature: Operating temperature is 32 °F …122 °F (0 °C ... 50 °C) ambient
UNPACKING THE CBV-2U4-3T(-N)
The CBV-2U4-3T(-N) is shipped in its own box. Multiple CBV-2U4-3T(-N) boxes may be packaged together in
a larger box. Upon receiving the CBV-2U4-3T(-N) controller shipment, immediately open and inspect the
contents. Check outside of the box for any physical damage. Contact the shipper immediately to report any
shipping-related damage to the product. ABB is not responsible for damage to the product caused by
shipping, either by a ABB -selected shipper or by a customer-specified shipping company.
INSTALLATION OF CBV-2U4-3T(-N)
PHYSICAL INSTALLATION OF CONTROLLER
When installing the CBV-2U4-3T(-N) controller you should consider the following:
•Selecting a location with the appropriate clearance.
•Determining the damper shaft diameter.
Note: Shaft diameter must be no larger than 5/8” (15.8 mm).
•Determining the direction of rotation for the damper.
•Accommodating dampers with less than a 90° actuator stroke.
•Mounting controller.

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Controller Dimensions and Clearances
The image below shows the mounting dimensions of the controller. Be sure to choose a location for the
controller that allows the documented clearance for installation and servicing.

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Determining Damper Shaft Direction of Rotation
Before mounting the actuator onto the shaft, users will need to determine the direction the shaft rotates in
order to open the damper (clockwise/cw or counter-clockwise/ccw). By default, the CBV-2U4-3T(-N) controller
is configured to open the damper in a clockwise/cw rotation. To change the rotation, digital set point
DampReverse (D230) R/W will need to be set to on (default off).
Damper Adaption (CBV-2U4-3T only)
Damper Adaption is a process whereby the actuator will drive one full cycle to its mechanical end-stop, after
which the actuator’s working range will be adapted to the actual mechanical angle of rotation. This can be
initiated by either
1. toggling DamperAdaption(D225) to ON then OFF , or
2. pressing the manual override button on the actuator once.
In the VAV actuator block in the Strategy, the damper synchronization option will also modulate the damper from
0 … 100 based on a CW/CCW switch. The integrated actuator in CBV-2U4-3T does not have a CW/CCW switch,
so this damper synchronization option simply cycles the damper from 0 % to 100 % . Toggling the
DamperAdaption(D225) binary point will accomplish the same thing.
Mounting controller to VAV box
Use the following steps for mounting the CBV-2U4-3T(-N) on the VAV box.
1. The controller is designed for two-point mounting, with one point being the damper shaft. Attach the
CBV-2U4-3T(-N) to the shaft of the VAV damper by slipping the damper shaft through the round hole
containing the “U” mounting bracket.
Note: Do NOT tighten it to the shaft at this time.
2. The controller has a mounting tab to the right side of controller. Ensure that the controller is positioned
correctly and is in its final position. When positioned correctly, finish fastening the controller to the VAV
box by screwing in the supplied screw through the mounting tab into the VAV box.
3. Before tightening the controller to the damper shaft, rotate the VAV damper blade to the closed
position.
4. While pushing in the Damper Manual Override button (located on the front of actuator), rotate the hub
to the full closed position.
5. Tighten the “U” mounting bracket to the damper shaft.
6. Using Polyethylene plenum-rated pneumatic tubing (not supplied), connect the airflow sensor on the
CBV-2U4-3T(-N) to the velocity pickup station on the VAV box. Be sure to connect the “high pressure/P1”
side of the CBV-2U4-3T(-N) to the “High” or “Total Pressure” connection of the VAV box. The “low
pressure/P2” side of the CBV-2U4-3T(-N) needs to be connected to the “Low” or “Static Pressure”
connection of the VAV box.
Note: An inline filter should be installed between the “high pressure/P1” input and the high pressure of the airflow
device.

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Accommodating Dampers with Less than a 90° Actuator Stroke
Use the following procedure to set the actuator to accommodate dampers with less than a 90° stroke.
1. If the angle of the damper opening is either 45° or 60°, close the actuator by pushing in the Damper
Manual Override button on the front of the actuator.
2. While holding the Damper Manual Override button in, rotate the hub until the damper is fully open.
3. Loosen the range stop screw and set range stop to appropriate position.
4. Tighten range stop screw so that the actuator will no longer be able to rotate beyond the point where
range stop was set.
Wiring the CBV-2U4-3T(-N)
Once the box type has been determined, users can then wire the CBV-2U4-3T(-N) for the network, the room
sensors, and the elements of the VAV box (fan, heating coils, valve, and so forth). This section will go over
the various wiring considerations for the CBV-2U4-3T(-N).
Connecting Power to the CBV-2U4-3T(-N)
The CBV-2U4-3T(-N) requires 24 V AC +/- 15% at 55 VA (up to 12 VA internal power plus up to 43 VA supplied to
Triac loads) maximum supplied from an externally mounted power transformer. One conductor of the 24-volt
side of transformer must be grounded to avoid damage to the controller. This conductor will be wired to the
CMN (common) of the controller. The wiring diagram is shown below:
CBV-2U4-3T
CBV-2U4-3T-N

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Wiring the RS-485 Network
Wiring the RS-485 network involves connecting the A+ and B- terminals in a daisy-chained configuration. One
end of the network will be connected to the subnet of the Target or fieldbus of router. At the other end of the
network, the last device must be “terminated” by either installing a 100 ohm to 120-ohm resistor or, if the last
device is a CBV-2U4-3T(-N), users can switch the “Fieldbus Terminator” to on. This will effectively terminate the
network. The shield, or drain wire, must be carried through the entire network. If the RS-485 network is wired
to a Target, then the shield will be grounded at the Target. If it is wired to a router, the shield must be grounded
at one point on the network as shown below:
Network-level Controller or
Router
CBV-2U4-3T(-
N)
Network Segment
end
- - - - - -
CBV-2U4-3T(-N)
Network end
Shield connected at end
of network only
Network
Termination
switch set to
OFF
Shield continuous
throughout the
network
Network cable segment
daisy-chained to next
device
Network
Termination switch
set to ON at end of
network
Shield connected to
earth at one end of
network only

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Wiring the Universal Inputs
The CBV-2U4-3T(-N) comes with 5 universal inputs. U/I-8 is dedicated to the internal air flow sensor. U/I-1
through U/I-4 are used for wiring in room sensors, set point adjust, discharge air sensors, CO₂sensors,
relative humidity sensors, and motion sensors, depending on the application. The sequences for this wide
range of applications are available within the preloaded strategy. See Configuring the CBV-2U4-3T(-N)
controller on page 21 of this manual for selecting the sequence for specific applications.
•U/I - 1 will typically be where the room temperature sensor is wired. This input is pre-configured to
support a 10K Type III thermistor. All room sensors purchased from ABB are 10K Type III.
Note: Room sensors that short the thermistor for push button occupancy are supported with this controller.
•U/I –2 will typically be where the room set point adjust is wired. This input is pre-configured to support
a 5K POT. All room sensors purchased from AAM are of this sensor type.
Note: It is possible to fine tune the set point adjusts or to change it to support a 10K POT by changing analog
setpoints SliderValAt_xx (A385 …A389 e.g. SliderValAt_0) R/W to change the resistance table. See Appendix :
List of CBV-2U4-3T(-N) points on page 61 for details on changing these values.
•U/I –3 is a dedicated input that has been configured to read a thermistor. In the pre-loaded strategy
this input is used for a supply air temperature sensor for auto changeover. See Primary Air State and
Damper Control on page 43 for more information on this feature.
•U/I –4 is configured as a voltage input. This input can be used for wiring in a CO2sensor, relative
humidity sensor, or a motion sensor (must be a dry contact closure).
Note: For CO₂or relative humidity sensors it must be a 0…10 V DC sensor type. To change the span for the CO₂
sensor that is installed, adjust the following:
oUI04CO2SensorBase (A253) Low range of sensor.
oUI04CO2SensorSpan (A254) Total range of senor.
To adjust the span for the relative humidity sensor that is installed, adjust the following:
oUI04SensorBase (A256) Low range of sensor.
oUI04SensorSpan (A257) Total range of senor.
IO POINTS
DESCRIPTION
UI-01
Zone Temperature (with optional override button)
UI-02
Setpoint Adjustment (optional 5K slider)
UI-03
Discharge Temperature (optional)
UI-04
CO₂, Humidity, or occupancy signal (all optional)
UI-08
Flowrate Sensor

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How to set up UI4 as a digital input
UI-4 on the CBV-2U4-3T is configured by default as an analog input, reading voltage, suitable for a CO₂or
humidity sensor.
This UI can also be configured to register digital input for a Local OCC sensor (registering occupancy in a space
using a PIR relay) or Spare Digital Input but to wire UI-4 for a digital input, you will need to put a 10 V DC power
supply in series with the digital switch:
The CBV strategy defines thresholds for voltage levels that would be considered a digital 1 or a digital 0 .
To set up UI-4 as an occupancy sensor,
1. open CXproᴴᴰ,
2. Right-click on the Site or Network containing the CBV and select Commission BACnet Devices.
3. In the Commission BACnet Devices dialog, click on the Inputs column of the relevant CBV:
This opens the VAV Configuration dialog:
Select Local OCC Sensor

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In the default CBV Strategy, the Local OCC Sensor setting expects the UI to be normally closed, i.e. when the
sensor reads 10 V DC the reading is interpreted as unoccupied .
When the sensor reads 0 V DC and the box is otherwise commanded off the box will go occupied. It will revert
to an unoccupied state after 30 seconds of reading 10 V DC from the sensor.
The threshold for UI-4 to register occupancy as ON is 2 V DC and the threshold for an OFF state is 4 V DC .
To set up UI-4 as a spare digital input:
1. open CXproᴴᴰ,
2. Right-click on the Site or Network containing the CBV and select Commission BACnet Devices.
3. In the Commission BACnet Devices dialog, click on the Inputs column of the relevant CBV:
This opens the VAV Configuration dialog:
Choose the option Spare Digital Input.
The digital point in the Strategy that will determine a digital status from UI-4 is UI04DigitalStatusHost (D235).
UI04DigitalStatusHost (D235) is configured in the Strategy to be normally closed, i.e. when UI-4 detects 10 V
DC the point will report an OFF value.
When the sensor reads 0 V DC the point will read an ON value.
The threshold for UI-4 to register the Spare Digital Input as ON is 2 V DC and the threshold for an OFF state is 4 V
DC .

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Wiring the Room Sensor
When using a Room Sensor with CBV-2U4-3T(-N) controllers, it is recommended that you use the ABB
FusionAir Smart Sensor or the ABB Cylon CBT-STAT(-H). There is a dedicated port designed for these on the
CBV-2U4-3T(-N), accessed by removing the top cover as illustrated below:
Alternatively, the diagram below illustrates the connection between CBV-2U4-3T(-N) and a typical standard
room sensor with a space temperature type III thermistor, including a 5K setpoint slide adjust.

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Wiring the Digital and Analog Outputs
Both CBV-2U4-3T and CBV-2U4-3T-N come with 3 digital outputs and 2 UniPuts™ (normally configured as
analog outputs) for controlling a wide variety of possible elements of the VAV box. In addition the CBV-2U4-
3T-N comes with 2 digital outputs for damper control (accessed by removing the top cover), and the CBV-
2U4-3T includes integrated damper control. It is possible to control single speed and variable speed fans
(both parallel and series), electric heat (optional pulse width modulation), proportional heating valves, and
tri-state heating valves depending on the application.
•DO-11 can be configured for controlling first stage electric heat (on-off or pulse width modulation
optional), or to open a tri-state heating valve.
•DO-12 can be configured for controlling second stage electric heat (on-off or pulse width modulation
optional), or to close a tri-state heating valve.
•DO-13 can be configured for controlling third stage (on-off or pulse width modulation optional), or to
control a single speed fan (series or parallel).
Note: It is also possible to define DO-13 as a start command for a variable speed fan (series or parallel).
Both AO-15 and DO-13 must be configured as either series or parallel for this feature.
•AO-14 can be configured for controlling any first stage modulating heating valves, SCR (Silicone
Controlled Rectifier), or EMC (Electronic Modulating Control) type controls depending on the heating
elements of the VAV box.
•AO-15 can be configured for controlling any second stage modulating heating valves, SCR (Silicone
Controlled Rectifier), or EMC (Electronic Modulating Control) type controls depending on the heating
elements of the VAV box. This output can also be configured for variable speed fan control (series or
parallel).
Note: AO-14 and AO-15 are preconfigured as a 0 …10 V dc direct acting output. During configuration it is
possible to configure either output or both outputs for reverse acting or 10 …0 V dc. Either or both
of these outputs can also be configured for 2 …10 V dc or 10 …2 V dc. In CBV-2U4-3T-N controllers
the DOs can now be configured for reverse acting.
IO POINTS
DESCRIPTION
DO-09
Damper Open/Close CBV-2U4-3T-N ONLY
DO-10
Damper Close/Open CBV-2U4-3T-N ONLY
DO-11
1st Stage Electric Heat (optional PWM) or Tri-State Heat Valve Open
DO-12
2nd Stage Electric Heat (optional PWM) or Tri-State Heat Valve Closed
DO-13
3rd Stage Electric Heat (optional PWM) or Fan Command (Series or Parallel)
AO-14
1st Stage Modulating Heat Control
AO-15
2nd Stage Modulating Heat Control or Variable Fan Speed Control (Series or
Parallel)

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Wiring Digital Outputs
The CBV-2U4-3T & CBV-2U4-3T-N can be wired to switch either hot 24 V AC or common. In most applications
users will be wiring the digital outputs to switch 24 V AC. To switch 24 V AC, users must wire an externally sourced
24 V AC hot to TRI CMN (triac common) on the CBV-2U4-3T & -N, the 24 V AC can be sourced from the same power supply
as the VAV, or an external 24 V AC source.
The diagram below is a typical wiring diagram for controlling a relay by switching 24 V AC.

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CONFIGURING THE CBV-2U4-3T(-N) FOR BACNET
COMMUNICATIONS
The CBV-2U4-3T(-N) is shipped with the following default settings:
MS/TP Address:
01
BACnet Instance Number
17101
MS/TP Baud Rate
38,400 bps
Serial to PC Baud Rate
9600 bps
To communicate to other MS/TP devices on a BACnet MS/TP network, the MS/TP address must be set to a
unique address within the MS/TP subnet. Where possible, there should be no gaps between MS/TP addresses.
The BACnet Instance Number must also be unique for the BACnet site. The MS/TP baud rate must match on all
devices on the MS/TP subnet. The PC Baud Rate should be left at the default value of 9600 bps.
The controller’s BACnet MAC address can be set either electronically (USB or BACnet) or manually using the 8-
way DIP switch.
•Manual setting for ease of replacement: Setting the 7-way DIP switch to an address between 1 and 254,
and then cycling the power, will force the controller to update its MAC address to match the DIP settings.
To replace a manually addressed controller in the field simply copy the DIP switch setting of the controller
you are replacing.
•Electronic setting for remote configuration: Setting the 7-way DIP switch to all zeros will allow the MAC
address to be set electronically either locally by USB or remotely over BACnet. It is also possible to use
manual setting for initial commissioning, and then cycling the power to force the controller to update its
MAC address to match the DIP settings. To enable subsequent electronic configuration, set the DIP switch
to all zeros. The controller will retain the manually set address until it is electronically overwritten.
The DIP switch can be used to set the MS/TP address when the device is first powered on.
•The address is set in binary, from 1 ( 0000001 ) to 127 ( 1111111 ).
•A switch moved to the left (towards the ‘ON’ mark) represents 1 , moved to the right represents 0 .
•The bottom-most switch is the least-significant bit, the switch on the top is the most-significant bit.
0000001
Address 1
1000000
Address 64
1011000
Address 88
1111111
Address127
0000000
Software Selectable*
For convenience, Appendix: List of DIP switch settings on page 71 shows a diagram for every address.
*Note: If the DIP switch is set to all zeros, the device will retain the address to which it was last set, but that address
can be subsequently overridden by software.
If no address had previously been set (e.g. when the device is received from the factory), then a device that is
powered-on with the DIP switch set to all zeros will use the last 2 digits of its serial number as its initial
address.

CBV-2U4-3T(-N) | Installation Overview
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The MS/TP baud rate must match on all devices on the MS/TP subnet. The PC Baud Rate should be left at the
default value of 9600 bps.
For the initial configuration of the device, the controller must first be powered on.
Note: Service Port (serial connection) must not be connected until after the device is powered on.
Note: Ensure the 24 V AC and Common wires are correctly connected to the controller. If the wires are
swapped, it may cause damage to anything connected to the controller.
If connecting directly to the CBV-2U4-3T(-N), use a UC32-PC commissioning cable by inserting the 9 pin D-Type
serial cable into a serial port of the PC on which NetLink is installed. Next, insert the RJ-45 connector into the
RJ-45 socket on the front of the CBV-2U4-3T(-N) controller.
If connecting to the CBV-2U4-3T(-N) through a room sensor that has been wired for serial communications,
insert the 9 pin D-Type serial cable into a serial port on the PC on which NetLink is installed, then insert the RJ-
12 connector into the RJ-12 socket on the room sensor.
Once connected to the controller, it is possible to change the settings on the controller using the CXproHD
or, preferably, NetLink. For details on how to use the CXproHD, please refer to the Cxpro
HD User Guide
(MAN0133) available from the ABB Library. For details on how to use NetLink, continue to the section
below.Once downloaded, NetLink must be installed. Follow the step by step installer and use the default
settings where possible.
1. Start NetLink from the Start menu or shortcut on your desktop that was created during install.
2. Select Preferences and in the drop-down menu select the COM port that is assigned to serial cable.
Controller Protocol must be set to “UC32”.
3. Click open.
4. Navigate to where the NetLink screens are saved and select the “IO_config.nls” screen.
5. Click on UnLock and type in the password.
Note: The NetLink screens have been configured with a password of “password ”.

CBV-2U4-3T(-N) | Installation Overview
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5. After unlocking the screens users can now select Controller Setup.
6. After selecting Controller Setup the following BACnet Controller Setup dialog will open:
7. From this window the BACnet MS/TP configuration settings can now be configured.
Note: It is not required to change the Site Number or Comms Controller preset values. It is however recommended to
match the Field Controller address with the MSTP Station address (see below).
MSTP Baud Rate is the Baud rate at which all the other devices on the subnet (fieldbus) are communicating. All
devices must be configured for the same baud rate for communications on the subnet.
Device ID is the BACnet device instance number. Every BACnet controller within the site must receive a unique
BACnet instance number to ensure proper communications. This BACnet instance number should be unique
even across subnets. See BACnet Manual (MAN0106) for further information.
Device Name is the user assigned name for the controller. This is not necessary for BACnet communications;
however, it is useful to name each controller for organizational purposes.
APDU Timeout seconds Leave this at the default setting of 3 seconds.
MSTP Station is the MS/TP device address. This is the unique address users must give each controller on the
subnet (fieldbus).
MSTP Max Masters is the maximum address that this controller will poll when in the “poll for masters” state.
Because this is a BACnet Master device it will go into this state to search for the next BACnet Master device to
pass the token to. To optimize the speed of the network, it is recommended that the last master device on
the subnet be set at the maximum MS/TP address on the network. For example, if the last device on the
subnet (fieldbus) is the CBV-2U4-3T(-N) at address 63 , then users would set the MSTP Max Masters to 63 . This
will speed up communications as it will not go into the “poll for masters” state and immediately pass the
token back to the device at MS/TP address 0 .
See the BACnet Manual (MAN0106) for more details regarding this functionality and for other tips on
optimizing the BACnet network.