ACI-Automation Components BACnet OUTSIDE SERIES Installation Instructions

BACnet OUTSIDE SERIES

Installation & Operation Instructions

GENERAL INFORMATION

The BACnet Outside Series sensor is designed for use with

electronic controllers in commercial heating and cooling

building management systems. The ACI BACnet Immersion

Series sensor can be ordered to monitor temperature, RH,

or temp/RH of outside environments. It uses BACnet MS/TP

for physical connection to a BAS or controller, has dip switch-

es to set addresses and baud rate, and has on board

end-of-line termination. There is no analog output.

WIRING INSTRUCTIONS

The BACnet Outside Series temperature sensor has a
depluggable terminal block located on the front of the
PCB. For ease of wiring, we recommend removing the
block, wiring, and reattaching before before
mounting. 16 to 22 AWG two conductor shielded

cable is recommended for powering the sensors.

ACI recommends using Belden 3105 or compatible
cable for RS-485 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
aect signal quality.

PRECAUTIONS

• DO NOT RUN THE WIRING IN ANY CONDUIT WITH

LINE VOLTAGE (24/120/230 VAC).

FIGURE 1: ENCLOSURE DIMENSIONS

EURO (-EH) ENCLOSURE

3.80"

4.30"

(109.22 mm)

PROBE 4.70”: TEMP. ONLY

2.12"

(53.72 mm)

PROBE 3.00”: RH and RH/TEMP.

2.12"

(53.72 mm)

(96.56 mm)

(119.46 mm)

3.00"

(76.20 mm)

4.70"

1.90"

(48.28 mm)

• Remove power before wiring. Never connect or

disconnect wiring with power applied.

• It is recommended 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.

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PRECAUTIONS

(Continued)

• 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.

MOUNTING INSTRUCTIONS

For optimal readings, follow these tips:

• Mount in shade on North side of the structure to

minimize sun exposure. In the Southern hemisphere

the South side of the building is where the sensor

should be mounted.

• Mount at least 1’-2’ (0.3-0.6 m) below eave to prevent

thermal radiation from aecting performance – see

FIGURE 2.

• Mount at least 4’ (1.22 m) above ground to prevent

thermal radiation rising up aecting performance.

• The plastic tube that houses the sensor must be

pointed down to avoid debris, water, or ice

potentially aecting sensor performance.

• Avoid mounting to chimney walls, above windows,

above vents, near doors, or dampers.

FIGURE 2: MOUNTING LOCATIONS

Roof

Recommended 1-2 ft

(0.3-0.6 m) Below Eave

Install Sensor

Downward

Ground

FIGURE 3: LAYOUT

TERMINAL BLOCKS

V D-GN

POWER

23618421421

4
6

ADDRESS BAUD

D+

BACNET

RESET BUTTON

LED

END OF LINE
TERMINATION

DIP SWITCH

EN DIS

Remove the cover from the housing by turrning counter

clockwise. Attach the base directly to the wall. Mounting

holes are located at the bottom of the housing – see

FIGURE 1. Drill pilot holes for the mounting screws. Use the

enclosure mounting holes as a guide, or use the dimensions

listed above to measure out.

Install the PG11 watertight tting supplied with the sensor if not

using conduit. The outer knockout ring (PG 11/16) on housing

should not be removed when using a ½” NPT conduit tting. Take

TABLE 1: WIRING CONNECTIONS

TERMINAL BLOCKS

+V

GN

D-

D+

CONNECTIONS

Power Supply Positive 12-36VDC / 24 VAC

Power Supply Common or Ground

EIA-485 Data Negative

EIA-485 Data Positive

care when mounting. Sensors should not be placed in

direct sunlight, or any other potential heating or cooling sources that could aect temperature being sensed.

Refer to the wiring instructions below to make necessary connections. After wiring, tighten the -EH cover clockwise onto the enclosure.
Conrm gasketed cover is fastened securely in order to prevent any moisture being introduced into housing.

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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. The max number of devices per segment is (32), as per the BACnet
specications. 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 congured 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 conguration 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

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 specic 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 (disabled), the resistance is not added. By default, the jumper is placed the DIS (disabled) position.

SW 1 (64)

0

0

0

SW 2 (32)

0

0

0

SW 3 (16)

0

0

0

SW 4 (8)

0

0

1

SW 5 (4)

0

0

1

TABLE 3: BAUD RATE SELECTION

BAUD RATE

Auto-Baud
9600
19200
38400
57600
76800
115200

SW 8

0
0
0
0
1
1
1

FIGURE 4: EOL TERMINATION JUMPERS

END OF LINE
TERMINATION ENABLED

END OF LINE
TERMINATION DISABLED

EN DIS EN DIS

SW 6 (2)

0

0

0

SW 9

0
0
1
1
0
0
1

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 denition 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 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 AND RH OFFSET

This device allows for a temperature oset of +/-5 °C (9 °F) and an RH oset of +/-10%. By default, these values are set to 0,
meaning no oset is added. These are set by writing to the present value of the Temperature Calibration Oset (AV0) or RH
Calibration Oset (AV1). The value written must be within the specied range or an error will be returned. To set these back
to factory settings, write any changed values to (0).

TABLE 4: UNIT SETTING

UNITS

°F

K

°C

VALUE

64

63

62

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
specic 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 3 (p. 2).

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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 Oset

RH Calibration Oset

PRODUCT SPECIFICATIONS

Supply Voltage:

Current Consumption:

Temperature Measurement Range:

Temperature Measurement Accuracy:

Temperature Calibration Oset:

RH Measurement Range:

RH Measurement Accuracy:

RH Calibration Oset:

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:

Sensing and Enclosure Material:

RANGE

0-4194302

-40.0 - 176.0

0.0 - 100

-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)

-40 to 176°F (-40 to 80°C)

@ 77°F (25°C): +/- 1.0°F (+/- 0.5°C)

+/- 9°F (+/- 5°C) (Field Congurable)

0 to 100%

@ 77°F (25°C): +/- 2% from 10 to 90% RH

+/- 10% RH (Field Congurable)

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 Congurable)

Screw Terminal Blocks / 16 AWG (1.31 mm2) to 22 AWG (0.33 mm2)

0.45 lbf-in (0.5 Nm) nominal

-40 to 176°F (-40 to 80°C)

-40 to 185°F (-40 to 85°C)

10 to 95% RH, non-condensing

Aluminum, diameter: 1.125” (28.58 mm) | “EH” Enclosure: ABS Plastic, UL94-V0

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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