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Figure 6: Pin Number Assignments for Sensor, SA Bus, and FC Bus Ports on Controllers
Sensor Port
The Sensor (SA Bus) port on the bottom of the controller
a connection for the VAV box Balancing Tool, specified network sensors, or other SA Bus devices with RJ-12 plugs.
When the FEC is configured for N2 communication, the SA Bus port must be used to download and commission
the controller.
The Sensor port is connected internally to the SA bus terminal block. See
Port pin assignment is shown in
Supply Power Terminal Block
The 24 VAC supply power terminal block is a gray, removable, 3-terminal plug that fits into a board-mounted jack
on the top right of the controller.
Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the terminal plug as
shown in
Figure
7. The middle terminal on the supply power terminal block is not used. See
information about the Supply Terminal Block.
FEC1611 and FEC1621 Field Equipment Controller Installation Instructions
(Figure
Figure
6.
3) is an RJ-12, 6-position modular jack that provides
Table 5
for more information. The Sensor
Table 5
for more
8
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