Figure 10: Device address rotary switch block
The device address must match the device address
defined in the Controller Configuration Tool (CCT)
under
Define Hardware > Network Settings
.
To set the device addresses on controllers, complete
the following steps:
1. Set a unique and sequential device address for
each of the equipment controllers connected
on the FC or SA, starting with device address 4.
2. To ensure the best bus performance, set
sequential device addresses with no gaps in
the device address range (4, 5, 6, 7, 8, 9, and
so on). The equipment controllers do not need
to be physically connected on the bus in their
numerical device address order.
3. Write each controller's device address on the
white label below the Device Address Rotary
Switch Block on the controller's cover.
For more information about controller device
addresses and how to set them on MS/TP buses,
refer to the
MS/TP Communications Bus Technical
Bulletin (LIT-12011034)
.
Removing a terminal block
To remove the terminal block from the circuit board,
complete the following steps:
Note:
You need a flat blade screwdriver to
remove the terminal block.
1. To prevent any possibility of damage from an
accidental short,
remove power from the
controller
.
2. Underneath the terminal block, in the small gap
between the bottom of the terminal block and
the circuit board, insert the flat blade of the
screwdriver.
Figure 11: Terminal block
3. To detach the left-hand side of the terminal
block, position the flat blade underneath the
terminal block to the left, and push down the
screwdriver handle. When you do this, you are
using the screwdriver as a lever to pry up the
terminal block.
4. To detach the right-hand side of the terminal
block, position the flat blade underneath the
terminal block to the right, and push down the
screwdriver handle.
5. If necessary, repeat steps 3 and 4 until the
terminal block is removed.
Setting the End-of-Line (EOL) switch
Each CVM controller has an EOL switch, which,
when set to ON (up), sets the CVM controller as
a terminating device on the bus. See
for the EOL switch location. The
default EOL switch position is OFF (down).
Figure 12: End-of-Line Switch Positions
To set the EOL switch on a CVM controller, complete
the following steps:
1. Determine the physical location of the
controller on the FC bus.
2. Determine if the controller must be set as a
terminating device on the bus.
Note:
For detailed information about
EOL termination rules and EOL switch
settings on FC buses, refer to the
MSTP
Communications Bus Technical Bulletin
(LIT-12011034)
.
3. If the controller is a terminating device on
the FC Bus, set the EOL switch to ON. If the
controller is not a terminating device on the
bus, set the EOL switch to OFF.
M4-CVM03050 VAV Controllers Installation Guide
17
