Setting The N2 Controller Address To Be Greater Than 127 - Johnson Controls FX-PCA3611 Installation Instructions Manual

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 controllers do not need to be physically connected on the bus in their numerical
device address order.
5. Write each controller's device address on the white label below the DIP switch block on the
controller's cover.
The following table describes the FC bus and SA bus devices addresses for FX-PC Series con-
trollers communications bus applications.
Refer to the FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670)
for more information on controller device addresses and how to set them on MS/TP buses.
Table 6: SA/FC bus device address descriptions
Device address Use on description
0 Reserved for FC Bus Supervisory Controller (not for use on controllers).
(Switch 128 Off)
1 to 3 Reserved for peripheral devices (not for use on controllers).
(Switch 128 Off)
4 to 127 Used for MS/TP master devices (controllers) that are hardwired to an SA bus or
FC bus.
(Switch 128 Off)
0 to 3 Reserved addresses for wired subordinate devices (not for use on controllers).
(Switch 128 ON)
4 to 127 Valid for MS/TP Master controllers on wireless FC Buses only.
(Switch 128 ON)

Setting the N2 Controller address to be greater than 127

N2-configured controllers support the full range of possible N2deviceaddressesprovidedby the
N2protocol standard (1-255). However, these controllers require special configuration for addresses
above 127. Use the following instructions for controllers with 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.
24 FX-PCA3611 Advanced Application Programmable Controller Installation Instructions
Note: FX-PC controllers ship with switch 128 ON and the remaining
address switches off rendering the controllers wired subordinate devices,
which do not operate on MS/TP buses.
Note: Do not connect a controller with switch 128 ON to an active (hard-
wired) SA or FC bus. When a controller with switch 128 ON and a device
address from 4 to 127 is connected to a wired field bus, the entire field
bus is rendered inoperable until the controller is disconnected or switch
128 is set to Off.