Communications wiring
Unit Ventilator
CARRIER CORPORATION ©2019
Integration Guide
All rights reserved
8
BACnet ARC156
To set up the Unit Vent for BACnet ARC156
1
Turn off the power for the Unit Vent by disconnecting power terminals.
2
Using the rotary switches, set a unique address. Set the
Tens
(
10's
) switch to the tens digit of the address,
and set the
Ones
(
1's
) switch to the ones digit.
EXAMPLE
If the controller’s address is 25, point the arrow on the
Tens
(
10
's) switch to 2 and the arrow on
the
Ones
(
1
's) switch to 5.
10's
1's
1
3
45
2
7
8
9
6
0
1
3
45
2
7
8
9
6
0
NOTE
The Unit Vent recognizes its address only after power has been cycled.
3
Set communications selector for
BACnet ARC156
.
4
Set the both DIP switches
3
and
4
OFF for BACnet ARC156.
NOTE
The baud rate for BACnet ARC156 is automatically 156 kbps, so DIP switches
1
and
2
are overridden.
5
Connect the communications wiring to the
Comm
port in the screw terminals labeled
Net +
,
Net -
, and
Shield
.
Wire specifications
○
A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○
Maximum wire length 2000 feet (610 meters) or 32 nodes
○
Devices should be daisy-chained and not star-wired
○
Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE
Use the same polarity throughout the network segment.
6
Turn on the power for the Unit Vent by connecting power terminals.
