Setting The N2 Controller Address To Be Greater Than 127 - Johnson Controls MS-FEC1611-1U Installation Instructions Manual

Table 6: SA/FC Bus Device Address Descriptions for MS/TP Controllers
Device Address
0 to 3
(Switch 128 ON)
4 to 127
(Switch 128 ON)

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.
FEC1611 and FEC1621 Field Equipment Controller Installation Instructions
Use on Description
Reserved addresses for wired slave devices (not for use on field controllers).
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.
Used for MS/TP master devices (field controllers) that are used in a ZFR or a ZFR Pro Wireless
Field Bus System.
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.
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