18 VAV-SVX07B-EN
Wiring Installation
Setting Up the UC400 Controller on a BACnet Link
Observe the following when setting up the UC400 controller on a BACnet link.
• Use 18 AWG shielded communication wire for BACnet MS/TP installations.
• Limit BACnet MS/TP wiring links to 4,000 ft. There is a maximum of 60 devices per link (without
a repeater).
Note: Two (2) BACnet links are available on the Tracer SC.
• Connect the BACnet link to the UC400 controller terminals
labeled Link as shown on the right. Incoming wires can be
connected to the first two terminals, and the outgoing
wires can be connected to the second set of terminals, so
there is only one wire per termination. For more details,
refer to the Unit Controller Wiring for the Tracer SC™
System Controller Wiring Guide (BAS-SVN03).
Setting the Address
The three (3) rotary address dials on the UC400 serve one or two purposes depending upon the
network: they are always used for the MAC Address, which is sometimes all or part of the BACnet
Device ID.
MAC Address
The MAC Address is required by the RS-485 communication protocol on which BACnet operates.
Valid MAC addresses are 001 to 127 for BACnet.
Important: Each device on the link must have a unique MAC Address/Device ID. A duplicate
address or a 000 address setting will interrupt communications and cause the Tracer
SC device installation process to fail.
BACnet Device ID
The BACnet Device ID is required by the BACnet network. Each device must have a unique number
from 001 to 4094302.
VAC
24
XFRM
BI4
AO1
BI
5
AO2
UI
1
UI
2
P
1
P
2
CNCNO
BO3
CNCNO
BO2
CNCNO
BO1
RELAYS
ADDRESS
TRIAC SUPPLY TRIACS
A
BO9BO8BO7BO6BO5BO4
AB
B
TX
RX
LINK
IMC
SERVI
C
E
SERVICE TOOL
CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS
BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9
1
2
3
4
5
6
7
8
9
0
x10
IM
C
1
1
3
4
5
6
7
1
2
3
4
5
6
7
8
9
0
x100
8
9
0
x1
Use a 1/8 inch (3.2 mm)
flathead screwdriver to
set rotary address dials.
These dials rotate in
either direction.
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