BACnet ROOM SERIES
Installation & Operation Instructions
GENERAL INFORMATION
The BACnet Room Series sensor is designed for use with
electronic controllers in commercial heating and cooling
building management systems. The ACI BACnet Room
Series sensor can be ordered to monitor temperature, RH,
or temp/RH in Commercial Room environments. It uses
BACnet MS/TP for physical connection to a BAS or
controller, has dip switches to set addresses and baud
rate, and has on board end-of-line termination. There is no
analog output.
WIRING INSTRUCTIONS
The BACnet Room Series temperature sensor has a
depluggable terminal block located on the backside of
the PCB. 16 to 22 AWG two conductor shielded cable is
recommended for powering the sensors.
PRECAUTIONS
• Do NOT run the wiring in any conduit with line
voltage (24/120/230 VAC).
FIGURE 1: LAYOUT
FRONT VIEW
LED
8421421
643216
BACK VIEW
BAUDADDRESS
RESET BUTTON
END OF LINE
TERMINATION
EN DIS
• Remove power before wiring. NEVER connect or
disconnect wiring with power applied.
• It is recommended that you use an isolated
UL-listed Class 2 transformer when powering the
unit with 24 VAC. Failure to wire the devices with the
correct polarity when sharing transformers may
result in damage to any device powered by the
shared transformer.
• If the 24 VDC or 24VAC power is shared with devices
that have coils such as relays, solenoids, or other
inductors, each coil must have an MOV, DC/AC
Transorb, Transient Voltage Suppressor (ACI Part:
142583), or diode placed across the coil or inductor.
The cathode, or banded side of the DC Transorb or
diode, connects to the positive side of the power
supply. Without these snubbers, coils produce very
large voltage spikes when de-energizing that can
cause malfunction or destruction of electronic
circuits.
D+ D- GN V
TERMINAL
BLOCKS
(LOCATED
ON BACK)
BACNET PWR
TABLE 1: WIRING CONNECTIONS
TERMINAL
BLOCKS
+V
GN
DD+
CONNECTIONS
Power Supply Positive 12-36 VDC / 24VAC
Power Supply Common or Ground
EIA-485 Data Negative
EIA-485 Data Positive
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MOUNTING INSTRUCTIONS
ACI recommends using BELDEN 3105 for communication
wiring. This wire has 120 ohm input impendence. The
terminal blocks allow for (1) or (2) wires to be connected
in each position for daisy chaining. Daisy chain the RS-485
wiring and do not use “Star” or “T” wiring.
Avoid running communication wires next to AC line
voltage wires. These can be sources of noise that can
aect signal quality.
For optimal readings, follow these tips:
• Do not install on external walls
• Avoid air registers, diusers, vents, and windows
• Avoid conned areas such as shelves, closed
cabinets, closets, and behind curtains
• Eliminate and seal all wall and conduit penetrations.
Air migration from wall cavities may alter temperature
readings.
• Do not install near heat sources. eg: lamps,
radiators, direct sunlight, copiers, chimney walls,
walls concealing hot-water pipes
• A thermally-insulated backing should be used
when tting to solid walls (concrete, steel, etc.).
ACI part: A/ROOM-FOAM-PAD. Be sure to cut out
an area for slotting the detachable terminal block.
Separate the cover from the base. Attach the base directly
to the wall or to a standard 2” x 4” junction box using the
(2) #6-32 x 1” screws provided.
FIGURE 2: ENCLOSURE DIMENSIONS
1.12"
(28.36 mm)
2.75"
(69.85 mm)
4.50"
(114.30 mm)
FRONT
DETACHABLE
TERMINAL BLOCK
BOTTOM
(5.05 mm)
FIGURE 3: MOUNTING DIAGRAM
DETACHABLE
TERMINAL BLOCK
MOUNTING SCREW
(#6-32 x 1”)
CIRCUIT BOARD
COVER
OPTIONAL
INSULATING GASKET
BACKPLATE
48” - 60”
(1.2 - 1.5 m)
0.20"
Refer to the wiring instructions (p. 1-2) to make necessary
connections. After wiring, attach the cover to the base by
snapping the top of the cover on rst and then the
bottom. Tighten the cover down, using the (2) 1/16” Allen screws located in the bottom of the housing. A 1/16” Hex driver is
needed to secure the cover to the base.
Take care when mounting. Check local code for mounting height requirements. Typical mounting heights are 48-60” (1.2-1.5 m) o
the ground and at least 1.5’ (0.5 m) from the adjacent wall. The sensor should be mounted in an area where air circulation is well mixed
and not blocked by obstructions.
*Reference FIGURE 2 and 3
BACnet MS/TP INTERFACE
The BACnet Master-Slave/Token-Passing (MS/TP) data link protocol uses EIA-485 as a two-wire, daisy chain network. A branch is
a discrete chain of devices connected to a controller.
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BACnet MS/TP INTERFACE (Continued)
The max number of devices per segment is (32), as per the BACnet specications. 4000 ft (1219.2 m) is the maximum
recommended length for a segment, which includes all devices from the controller to the last device in the daisy chain. ACI’s
BACnet sensors are master devices. Only master nodes are allowed to send and receive tokens on the MSTP network.
Each branch must have all devices connected with (+) connected to (+) and (-) connected to (-). If a shielded cable is used, this is
not to be connected to the devices. The shield cable should only be connected on one end to earth ground, usually at the
controller. The start and end of each branch should have a termination resistor at the device level or at the controller.
Each device must be congured for the correct baud rate and have a unique address in each branch. The baud rate for the branch
is set by the controller. This product has auto-baud for ease of network conguration but setting the baud rate using the DIP
switches is recommended.
ADDRESS SELECTION
Switches 1-7 are used to set the BACnet address. Refer to TABLE 2 for switch settings. Each device in a network branch must
have a unique address. The value of each position is printed on the board. By default, the address is (0). If the device is
powered when a change is made, the device must be power cycled or reset for changes in address to be made.
TABLE 2: ADDRESS SELECTION
ADDRESS
0
1
12
SW 1 (64)
0
0
0
BAUD RATE SELECTION
Switches 8-10 are used to set the BACnet baud
rate. Refer to TABLE 3 for switch settings. Where
(0) is low and (1) is high. By default, the device is in
auto-baud. If the system’s baud rate is known, it is
recommended to set the specic baud rate to
match the system. If the device is powered when a
change is made, the device must be power cycled
or reset for changes in baud rate to be made.
EOL TERMINATION
RESISTANCE SELECTION
RS-485 requires that the last device in a chain
have a termination resistor. This is controlled
using a jumper in the EN (enabled) position
marked on FIGURE 4. When the jumper is set
to EN (enabled), a 120 Ω resistance is added in
parallel to the data line. When the jumper is
set to DIS (disable), the resistance is not
added. By default, the jumper is placed in the
DIS (disabled) position.
SW 2 (32)
0
0
0
SW 3 (16)
0
0
0
SW 4 (8)
0
0
1
SW 5 (4)
0
0
1
SW 6 (2)
0
0
0
TABLE 3: BAUD RATE SELECTION
BAUD RATE
Auto-Baud
9600
19200
38400
57600
76800
115200
SW 8
0
0
0
0
1
1
1
SW 9
0
0
1
1
0
0
1
FIGURE 4: EOL TERMINATION JUMPERS
END OF LINE
TERMINATION ENABLED
END OF LINE
TERMINATION DISABLED
EN DIS EN DIS
SW 7 (1)
0
1
0
SW 10
0
1
0
1
0
1
0
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DEVICE CONFIGURATION THROUGH BACnet
DEVICE INSTANCE
The Device Instance, by default, is 1035000 plus the Address. For example, an Address of 21 results in a default address
of 1035021. This can be changed once the device is connected to the network, but each device instance must be unique
within the network. The device instance must be unique throughout the entire BACnet network, not just this segment.
DEVICE LOCATION
The device location is optional but is intended to allow for further denition of the device’s location. The device location can
be a character string up to 64 characters in length.
DEVICE NAME
By default, the device name is based on the type of device and the address. The device name can be a character string up to
(32) characters in length. This can be changed once the device is connected to the network. For example: Temperature
Sensor - 034. The device name must be unique throughout the entire BACnet network, not just this segment.
DEVICE DESCRIPTION
By default, the device name is based on the type of device and the address. The device name can be a character string up
to (32) characters in length. This can be changed once the device is connected to the network. For example: Temperature
Sensor - 034. The device name must be unique throughout the entire BACnet network, not just this segment.
LED INFORMATION
One LED indicates three statuses. Solid green shows that power is good, but no data is transmitting. A solid Amber indicates that
auto-baud is set and no data has been received to set a baud rate. Green/Amber ashing indicates data is being transmitted or
received. Solid Red LED status indicates an error state, usually loss of communication on the network. If this status remains for
(10) times the APDU timeout, the device will automatically reset. If this state remains longer than that, reset the device.
TEMPERATURE CONFIGURATION
One LED indicates three statuses. Solid green shows that power is good,
but no data is transmitting. A solid Amber indicates that auto-baud is set
and no data has been received to set a baud rate. Green/Amber flashing
indicates data is being transmitted or received. Solid Red LED status
indicates an error state, usually loss of communication on the network. If
this status remains for (10) times the APDU timeout, the device will
automatically reset. If this state remains longer than that, reset the device.
TEMPERATURE AND RH OFFSET
This device allows for a temperature oset of +/-5 °C (9 °F) and an RH oset of +/-10%. By default, these values are set to 0,
meaning no oset is added.
These are set by writing to the present value of the Temperature Calibration Oset (AV0) or RH Calibration Oset (AV1). The
value written must be within the specied range or an error will be returned. To set these back to factory settings, write any
changed values to (0).
TEST MODE
For the Sensor objects (AI0 and AI1), a test mode can be set by writing the Boolean value true to the “out-of-service”
property. Then the present-value can be set to any valid test value the user requires. This allows a user to test reactions to
specic values returned by this device.
RESET
The reset button can be used to reset the device without disconnecting power. The location of this button is shown in
FIGURE 1 (p.1).
TABLE 4: UNIT SETTING
UNITS
°F
K
°C
VALUE
64
63
62
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TABLE 5: BACnet OBJECT TABLE
OBJECT TYPE
Device
Analog
Inputs
Analog
Values
OBJECT ID
- - - - - - - - - -
AI-0
AI-1
AV-0
AV-1
OBJECT NAME
BN11x0
Temperature Sensor
RH Sensor
Temperature
Calibration Oset
RH Calibration Oset
PRODUCT SPECIFICATIONS
Supply Voltage:
Current Consumption:
Temperature Measurement Range:
Temperature Measurement Accuracy:
Temperature Calibration Oset:
RH Measurement Range:
RH Measurement Accuracy:
RH Calibration Oset:
Temperature / RH Update Rate:
Communication Protocol:
Sensor Addresses:
Supported Baud Rates:
Device Instance Number:
Connections / Wire Size:
Terminal Block Torque Rating:
Operating Temperature Range:
Storage Temperature Range:
Operating Humidity Range:
Enclosure Material / UL Flammability:
RANGE
0-4194302
34.7 - 122.0
0.0 - 95.0
-9.0 - 9.0
-10.0 -10.0
BACnet ENGINEERING UNITS
- - - - - - - - - - - - - - - - - - - - - - - - - -
degrees-Fahrenheit (64) - default
percent-relative-humidity (29)
delta-degrees-Fahrenheit (120)
percent-relative-humidity (29)
12 to 36 VDC / 24 VAC +/- 10%, 50/60 Hz (Reverse Polarity Protected)
25 mA maximum (0.67 VA)
35 to 122°F (1.5 to 50°C)
@ 77°F (25°C): +/- 1.0°F (+/- 0.5°C)
+/- 9°F (+/- 5°C) (Field Congurable)
0 to 95%
@ 77°F (25°C): +/- 2% from 10 to 90% RH
+/- 10% RH (Field Congurable)
4 seconds
BACnet MS/TP; EIA RS-485
0 to 127 (0 (Default); Field Selectable)
Auto Baud (Default), 9600, 19200, 38400, 57600, 76800, 115200 (Field Selectable)
1035000 + Address (example: Address 127 = 1035127; Field Congurable)
Screw Terminal Blocks / 16 AWG (1.31 mm2) to 22 AWG (0.33 mm2)
0.45 lbf-in (0.5 Nm) nominal
35 to 122°F (1.5 to 50°C)
-40 to 185°F (-40 to 85°C)
10 to 95% RH, non-condensing
ABS Plastic / UL94-HB
W.E.E.E. DIRECTIVE
At the end of their useful life the packaging and product should be disposed of via a suitable recycling centre. Do not
dispose of with household waste. Do not burn.
BACnet is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to the requirements of ASHRAE
Standard 135 is the responsibility of BACnet International (BI). BTL is a registered trademark of BACnet International.
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