Table 2: FC bus configuration
Description
1
Wiring for a terminating device on the FC bus
2
FC bus terminal blocks
3
Wiring for a daisy-chained device on an FC bus segment
4
Connects to the next device on the FC bus
5
Isolated Shield connection terminal
Note:
The Shield terminal (SHD) on the FC Bus
terminal block is isolated and can be used to connect
the cable shields on the bus (Figure 4).
SA bus terminal block
The SA Bus terminal block is an orange, removable, 4-
pin terminal block with +15 VDC that fits into a board-
mounted pin header.
When connecting an SA Bus device to the controller, wire
the SA Bus terminal block on the controller and other
SA Bus devices in a daisy-chain configuration using 4-
wire twisted, shielded cable as shown in Figure 5. For
more information about SA Bus terminal functions,
requirements, and ratings, see Table 7.
Figure 5: SA bus terminal block wiring
Table 3: SA bus configuration
Description
1
Wiring for a terminating device on SA bus
2
SA bus terminal blocks
3
Wiring for a daisy chained device on SA bus
4
Cable shield connection
Note:
Connect the shields to ensure they are
continuous the entire length with only one ground
location.
5
Connects to the next device on the SA bus
Note:
Stranded, 4-wire (2 twisted pair) shielded
cable. One twisted pair is the + and - leads. The
second pair is COM and POWER.
Note:
Do not use the modular SA Bus port and the
terminal block SA Bus simultaneously. Only use one
of these connections at a time.
Note:
The CVM controller is the EOL for the SA Bus.
Modular ports
The modular SA and FC bus ports on the face of the CVM
(Figure 6) are RJ-12 (6-position) modular jacks as shown in
Figure 6.
The modular SA Bus port provides a connection for
the MAP Gateway, VAV Balancing Tool, DIS1710 Local
Controller Display, WRZ78xx Series One-to-One Wireless
Transmitter, and NS Series sensors.
The modular FC Bus port provides a connection for MAP
Gateway and the ZFR/ZFR Pro Wireless Router.
Figure 6: Pin number assignments for FC bus and SA
ports on equipment controllers
Note:
Do not use the modular SA Bus port and the
terminal block SA Bus simultaneously. Only use one
of these connections at a time.
Supply power terminal block
The 24 VAC supply power terminal block is a gray,
removable, 2-pin terminal block that fits into a board-
mounted pin header on the upper left of the CVM03050
controller.
Wire the 24 VAC supply power wires from the transformer
to the HOT and COM terminals on the terminal block as
shown in Figure 7. For more information about Supply
Power terminal functions, requirements, and ratings, see
M4-CVM VAV Box Controllers Installation Guide
5
