Setting The N2 Controller Address To Be Greater Than 127 - Johnson Controls FEC26 Series Installation Instructions Manual

Table 7: SA/FC Bus Device Address Descriptions
Device Use on Description
Address
0 to 3 Reserved addresses for wired slave devices
(not for use on field controllers).
(Switch
128 ON) Note: Metasys field controllers ship with
switch 128 ON and the remaining
address switches off rendering the
controllers wired slave devices, which
do not operate on MS/TP buses.
4 to 127 Valid for MS/TP Master controllers on wireless
FC Buses only.
(Switch
128 ON) Note: Do not connect a field 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.
FEC26 Field Equipment Controllers Installation Instructions
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 controllers 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 SA bus connection, 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 to the controller.
9. Set the address switch segment labeled 128 to ON.
10. Reattach the FC Bus connector to the controller.
11. Reconnect the 24 VAC supply to the controller.
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