FXVMA Installation Instructions
6
Network Room Module (NRM) Wiring Details
The NRM connects to the Remote Display Bus of the
FXVMA at the 4-terminal connection marked SENSOR.
You can connect the NRM up to 30.5 m (100 ft) from
the FXVMA.
Use Figure 13 to make the wiring connections between
the FXVMA and the NRM.
Supervisory Link Wiring Details
N2 Bus Wiring Details
The N2 bus is a communications network consisting of
three wires carrying RT+, RT-, and REF signals. For
more information on the N2 bus, refer to the
N2
Communication Bus Technical Bulletin (LIT-636018)
.
N2 devices, including the FXVMA, are networked
together in a daisy-chain configuration. For runs up to
1,520 m (5,000 ft), we recommend you use stranded
22 AWG, twisted 3-conductor wire. Avoid using solid
wire when possible, as it is prone to break when pulled.
The N2 bus may be extended to a maximum length of
4,568 m (15,000 ft) using two repeaters.
Use Figure 14 to make the N2 bus connections to the
FXVMA.
BACnet MS/TP Bus Wiring Details
The BACnet MS/TP bus is a communications network
consisting of three wires carrying RT+, RT-, and REF
signals. For more information on the rules of the MS/TP
Communications Bus, refer to the
MS/TP
Communications Bus Technical Bulletin
(LIT-12011034)
.
Use Figure 14 to make the BACnet MS/TP bus
connections to the FXVMA.
BACnet MS/TP devices, including the FXVMA, are
networked together in a daisy-chain configuration. For
runs up to 1,220 m (4,000 ft), we recommend you use
stranded 22 AWG, twisted 3-conductor wire. Avoid
using solid wire when possible as it is prone to break
when pulled.
Power Wiring Details
The FXVMA requires 24 VAC power. Use Figure 15 to
make power wiring connections.
Setup and Adjustments
Setting the N2 Address
The N2 address switch sets a unique address for the
FXVMA on the N2 bus.
Set the N2 address using the DIP switches on the face
of the FXVMA. The address equals the sum of the
numbers set to ON. For example, if the first (1), the
third (4), and the fifth (16) DIP switches are set to ON,
the device address is 21 (1 + 4 + 16 = 21). Use
addresses 3-255. See Figure 16.
Figure 13: NRM Connection
RT+
RT- COM
PWR
LL -
LL +
SE
NS
O
R
COM
NETWORK ROOM
MODULE
PWR
FXVMA
FI
G
: n
rm
c
o
n
n
e
c
ti
o
n
Figure 14: N2 or BACnet MS/TP Bus Wiring
SHLD
RT -
RT +
S
U
PER
VI
SOR
Y
LI
N
K
TO NEXT N2 OR
BACNET DEVICE
FROM LAST N2 OR
BACNET DEVICE
COM
FXVMA
Figure 15: Power Wiring Connections
HOT
COM
24
~
GROUND
480/277/240/
208/120/24/
24VAC
WHERE 2 OR MORE DEVICES
SHARE A SINGLE
TRANSFORMER, MAINTAIN
POLARITY (COM TO COM)
BETWEEN DEVICES
FXVMA
F
IG
: w
ir
ingc
on
ne
c
tio
n
s
Figure 16: Setting the DIP Switches to Address 21
128
64
32
16
8
4
2
1
O
N
F
IG:
F
XVMA
Ad
d
re
ss