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Automation Components, Inc.

2305 Pleasant View Road  |  Middleton, WI 53562

Phone:

 1-888-967-5224  |  

Website:

 workaci.com

Page 1

FIGURE 1: 

ENCLOSURE 

DIMENSIONS

BACnet / Modbus IMMERSION SERIES

Installation & Operation Instructions

Phone:

 1-888-967-5224

Website:

 workaci.com

GENERAL INFORMATION

The BACnet MS/TP / Modbus RTU Immersion Series 
sensor is designed for use with electronic controllers 
in commercial heating and cooling building manage-
ment systems. The ACI BACnet MS/TP / Modbus RTU 
Immersion Series sensor can be ordered to monitor 
temperature in commercial HVAC pipes. It uses 
BACnet MS/TP or Modbus for RTU for physical 
connection to a BAS or controller, has dip switches to 
set addresses and baud rate, parity and stop bits 
(Modbus RTU only) and has on board end-of-line 
termination. There is no analog output.

WIRING INSTRUCTIONS

The BACnet/Modbus RTU Immersion 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 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 
affect signal quality.

PRECAUTIONS
• 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. 

3.60"

(91.44 mm)

2.25"

(57.15 mm)

4.79"

(121.55 mm)

2.35"

(59.80 mm)

TABLE 1: 

WIRING CONNECTIONS

CONNECTIONS

Power Supply Positive 12-36 VDC / 24 VAC
Power Supply Common or Ground
EIA-485 Data Negative
EIA-485 Data Positive

TERMINAL 
BLOCKS

+V
GN
D-
D+

FIGURE 2: 

LAYOUT

DIP SWIT

CH

BAU
D

ADDRESS

OFF

ON

PA

R

SW4

BAC

NET

MOD

BUS

RESET

BUTTON

END OF LINE

TERMINATION

LED

EN

DIS

D+

D-

GN

V

64

32

16

8

4

2

1

4

2

1

1

ON

1

2

2
3
4

TERMINAL

BLOCKS

Version: 2.0

I0000929

Summary of Contents for BACnet / Modbus IMMERSION Series

Page 1: ...tor 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 bloc...

Page 2: ...no stratification Reference FIGURE 4 Make sure the entire thermowell is immersed If the thermowell is longer than the pipe diameter the thermowell should be installed in an elbow or Tee Apply thermal...

Page 3: ...NPS process thread to be used with a machined thermowell or previously installed thermowell Verify the existing thermowell insertion length of the pipe is suitable for your selected Immersion If the...

Page 4: ...a 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 SW4 OFF ON 1 ON 2 3 4 BACnet MS TP and Modbus RTU INTERFACE Contin...

Page 5: ...when a change is made the device must be power cycled or reset for changes in address to be made DEVICE CONFIGURATION THROUGH BACnet DEVICE INSTANCE The Device Instance by default is 1035000 plus the...

Page 6: ...NAME BN211x0 Temperature Sensor RH Sensor Temperature Calibration Offset RH Calibration Offset OBJECT ID AI 0 AI 1 AV 0 AV 1 TABLE 6 BACnet OBJECT TABLE DEVICE CONFIGURATION THROUGH MODBUS RTU MODBUS...

Page 7: ...tring of the Firmware Version For example 02 00 000 90 Sensors Present Reserved Temperature Sensor Value RH Sensor Value Temperature Range Min Temperature Range Max RH Range Min RH Range Max Unsigned...

Page 8: ...ite workaci com 1001 1002 9001 Thru 9016 9017 Thru 9048 9049 Thru 9080 User can set what temperature value Tenths that would be returned when reading IR3 and Test Mode is Enabled in CL1001 For Example...

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