Table 8: Wireless field bus device address
Device address Address description
4 to 127
(Switch 128 ON)
Valid for MSTP Master field controllers on
wireless FC Buses only
.
Note:
Do
not
connect a
Metasys
controller
with these device addresses to an active
wired
SA or FC Bus. When a controller
with one of these device address 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.
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 (1–254). However, these
controllers require special configuration for
addresses above 127.
Use the following instructions for controllers greater
than 127.
Note:
This special configuration is required
because controller addresses above 127 were
originally intended for use with the Wireless
Field Bus system.
Note:
Prior to performing this procedure,
be sure the controller has been converted
from BACnet to N2 protocol first. Refer to the
Modernization Guide for Legacy N2 Controllers
(LIT-12012005)
for more information.
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.
Setting the EOL switch
Each field controller has an EOL switch, which,
when set to ON (up), sets the field controller as
a terminating device on the bus. See for the EOL
switch location on the field controller. The default
EOL switch position is OFF (down). The amber EOL
LED illuminates to show the EOL is active.
Figure 10: EOL switch positions
To set the EOL switch on a field 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
MSTP Communications Bus
Technical Bulletin (LIT-12011034)
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.
VMA1617 and VMA1632 VAV Controllers Installation Guide
17
