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Setting the Device Address

FX-PC Series Controllers are master devices on BACnet

MS/TP (SA or FC) Buses. Before operating FX-PC
controllers on a bus, you must set a valid and unique
device address for each controller on the bus.

You set an FX-PC controller’s device address by setting
the positions of the switches on the Device Address DIP
switch block at the top of the controller. Device addresses
4 through 127 are the valid addresses for these
controllers.

The DIP switch block has eight switches numbered 128,
64, 32, 16, 8, 4, 2, and 1. Switches 64 through 1 are
device address switches. Switch 128 is a mode switch
that enables an FX-PC controller to operate on an
FX-ZFR Series Wireless Field Bus. Switch 128 must be
set to OFF for all hard-wired SA and FC Bus applications.
Set Switch 128 to ON for wireless FC Bus applications
only.

Figure 5: Device Address Switches Set to 21

Note:

FX-PC Series Controllers ship with Switch 128
ON and the remaining address switches OFF.
This renders the controllers wired slave devices,
which do not interfere on MS/TP Buses and do
not interfere with bus operation. Set a valid and
unique device address on the controller before
applying power to the controller on the bus.

To set the device addresses on an FX-PC Series
Controller:

1. Set all of the switches on the controller’s device

address DIP switch block (128 through 1) to OFF.

2. Set one or more of the seven address switches (64

through 1) to ON, so that the sum of the switch
numbers set to ON equals the intended device
address. See

Table 4

and

Table 5

for valid FX-PC

controller addresses.

Set the highest number switch that is less than or
equal to the intended device address to ON. Then
continue setting lower numbered switches until the
total equals the intended address. For example, if the
intended device address is 21, set Switch 16 to ON
first, then set Switch 4 ON, followed by Switch 1
(16+4+1=21).

3. Set Switch 128 to ON only for controllers on an

FX-ZFR Series Wireless Field Bus application. For

all hard-wired SA and FC Bus applications, ensure
that Switch 128 is set to OFF.

Note:

Do not connect a wirelessly enabled FX-PC
controller to a wired FC Bus.

Refer to the

FX-ZFR Series Wireless Field Bus

System Technical Bulletin (LIT-12011660)

for more

information on device addresses in wireless
applications.

4. Set a unique and sequential device address for each

of the FX-PC controllers connected on the SA or FC
Bus, starting with device address 4.

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 FX-PC
controllers do not need to be physically connected
on the bus in their numerical device address order.

5. Write each FX-PC controller’s device address on the

white label below the DIP switch block on the
controller’s cover.

Refer to the

FX-PC Series Controllers MS/TP

Communications Bus Technical Bulletin (LIT-12011670)

for more information on FX-PC controller device
addresses and how to set them on MS/TP Buses.

Table 4

and

Table 5

show and describe the valid FC Bus

and SA Bus device addresses for Johnson Controls

MS/TP communications bus applications.