aci BACnet / Modbus IMMERSION Series Installation & Operation Instructions

BACnet / Modbus IMMERSION SERIES
Installation & Operation Instructions

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
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
a ect 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.
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
RTU Immersion Series
FIGURE 1: ENCLOSURE
DIMENSIONS
3.60"
(91.44 mm)
2.25"
(57.15 mm)
FIGURE 2: LAYOUT
TERMINAL
BLOCKS
V GN D- D+
SW4
BAC MOD
NET BUS
Reset
BUTTON
TABLE 1: WIRING CONNECTIONS
TERMINAL CONNECTIONS
BLOCKS
+V
Power Supply Positive 12-36 VDC / 24 VAC
GN
Power Supply Common or Ground
D-
EIA-485 Data Negative
D+
EIA-485 Data Positive
Page 1
Phone: 1-888-967-5224
Website: workaci.com
2.35"
(59.80 mm)
LED
END OF LINE
TERMINATION
EN DIS
64
32
16
8
4
2
1
4
2
2
1
1
Version: 2.0
I0000929