Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone:
1-888-967-5224 |
Website:
workaci.com
Page 1
Version: 2.0
I0000927
BACnet / Modbus DUCT SERIES
Installation & Operation Instructions
Phone:
1-888-967-5224
Website:
workaci.com
GENERAL INFORMATION
The BACnet MS/TP / Modbus RTU Duct 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
Duct Series sensor can be ordered to monitor
temperature, RH, or temp/RH in commercial HVAC
ductwork. It uses BACnet MS/TP or Modbus 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 Duct 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.
FIGURE 1:
ENCLOSURE
DIMENSIONS
EURO (-EH): RH and RH/TEMP.
PLASTIC BOX (-PB): TEMP. ONLY
1.90"
(48.28 mm)
4.30"
(109.22 mm)
3.80"
(96.56 mm)
3.60"
(91.44 mm)
2.25"
(57.15 mm)
1.51"
(38.25 mm)
3.01"
(76.51 mm)
10.05"
(255.32 mm)
2.12"
(53.72 mm)
4.79"
(121.55 mm)
2.35"
(59.80 mm)
