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
