Setup and adjustments
Important: Electrostatic discharge can damage controller components. Use proper
electrostatic discharge precautions during installation, setup, and servicing to avoid damaging
the controller.
Configuring N2 communications
N2-capable controllers support the full range of possible N2 device addresses provided by the N2
protocol standard (1-254).
To configure a controller to communicate using the N2 protocol, complete the following steps:
1. Disconnect the 24 VAC supply from the controller.
2. Set the address switches to the desired N2 address. For details about setting a device address,
see Setting the device address.
3. Reconnect the 24 VAC supply to the controller.
4. Using an SA bus connection, download the firmware and controller application file configured
for N2 to the controller.
Switching the communications protocol from N2 to MS/TP
For N2 sites that are converting to BACnet MS/TP, you can switch the communications protocol of
N2-configured MS/TP controllers back to BACnet MS/TP.
To switch the CVM controller operating in N2 mode back into BACnet MS/TP mode, complete the
following steps:
1. Disconnect the 24 VAC supply from the controller.
2. Set the address switches to the desired BACnet MS/TP address. For details about setting a
device address, see Setting the device address.
3. Reconnect the 24 VAC supply to the controller.
4. Using an SA Bus connection, download a controller application file configured for BACnet MS/
TP to the controller.
Configuring wireless communications
To configure a controller for use with the FX-ZFR/ZFR Pro Series Wireless Field Bus system, complete
the following steps:
1. Disconnect the 24 VAC supply from the controller.
2. Wire the input/output terminals and SA bus.
Note: In wireless network applications, do not connect any wires to the FC bus terminal
block. (Connect the FC/SA terminal block on an FX-PCX to an SA bus only.)
3. Important: Before the CVM controller is powered on, connect the FX-ZFR/ZFR Pro Wireless
Field Bus Router to the FC bus port (RJ-12 modular jack) on the front of the controller.
23F4-CVM VAV Terminal Equipment Controllers Installation Instructions
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