Table 5: Wireless Field Bus Device Address
Address Description
Device
Address
Reserved addresses for wired slave devices
(not valid for FX-PC controllers).
FX-PC Series Controllers ship with 128 ON
and the remaining address switches OFF,
rendering the controller's wired slave devices,
which do not operate on FX-PC field busses.
0 to 3
(Switch 128
ON)
Valid for FX-PC Series Controllers on
wireless
FC Buses only
.
4 to 127
(Switch 128
ON)
Note:
Do
not
connect an FX-PC Series
controller with these device addresses
to an active
wired
SA or FC Bus.
When a controller with one of these
device addresses is connected to a
wired field bus, the field bus is
rendered inoperable until the controller
is disconnected or Switch 128 is set
to OFF.
Setup and Adjustments
Important:
Electrostatic discharge can damage
controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
Setting the N2 Controller Address to
Be Greater than 127
N2-configured controllers support the full range of
possible N2 device addresses provided by the N2 protocol
standard (1-255). However, these controllers require
special configuration for addresses above 127.
Use the following instructions for controller addresses
greater than 127.
Note:
Before you perform this procedure, make sure
that your controller has been converted from
BACnet to N2 protocol first. Refer to the
Modernization Guide for Legacy N2 Controllers
(LIT-12012005)
for more information.
Note:
This special configuration is required because
controller addresses above 127 were originally
intended for use with the Wireless Field Bus
system.
1.
Disconnect the 24 VAC supply from the controller.
2.
Remove the FC Bus connector from the controller.
3.
Set the address switch set to the desired N2 address.
4.
Set the address switch segment labeled 128 to OFF.
5.
Reconnect the 24 VAC supply to the controller.
6.
Using an FX-PCT tool connection at the FX-PC
controller’s SA bus, download the firmware and
controller application file. The download process
asks to confirm switching the communication protocol
to N2.
7.
Click OK.
8.
After the download is finished, disconnect the
24 VAC supply from the FX-PC controller.
9.
Set the address switch segment labeled 128 to ON.
10. Reattach the FC Bus connector to the FX-PC
controller.
11. Reconnect the 24 VAC supply to the FX-PC
controller.
Setting the EOL Switch
Each FX-PC controller has an end-of-line (EOL) switch,
which, when set to ON (up), sets the controller as a
terminating device on the bus. See
for the EOL
switch location on the FX-PC controller. The default EOL
switch position is OFF (down). The amber EOL LED
illuminates to show the EOL is active.
Figure 6: EOL Switch Positions
To set the EOL switch on an FX-PC controller:
1. Determine the physical location of the controller on
the SA or FC Bus.
2. Determine if the controller must be set as a
terminating device on the bus.
Note:
The EOL termination rules for SA Buses and
FC Buses are different. Refer to the
FX-PC
Series Controllers MS/TP Communications
Bus Technical Bulletin (LIT-12011670)
for
detailed information regarding EOL termination
rules and EOL switch settings on SA and FC
Buses.
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.
Note:
When the EOL switch is set to ON, the LED
light on the face of the controller is illuminated.
9
FX-PCV1656 Programmable VAV Box VAV Controllers Installation Instructions
