Carrier VVT Zone - Wiring the VVT Zone Controller to the MS;TP Network; Wiring Specifications; To Wire the Controller to the Network

Installation
10 VVT Zone Controller
Wiring the VVT Zone Controller to the MS/TP network
The VVT Zone Controller communicates using BACnet on an MS/TP network segment communications at
9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps.
Wire the controllers on an MS/TP network segment in a daisy-chain configuration.
Install a BT485 on the first and last controller on a network segment to add bias and prevent signal
distortions due to echoing.
See the MS/TP Networking and Wiring Installation Guide for more details.
Wiring specifications
Cable: 22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length: 2000 feet (610 meters)
To wire the controller to the network
1 Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac or Hot.
2 Check the communications wiring for shorts and grounds.
3 Connect the communications wiring to the BACnet port’s screw terminals labeled Net +, Net -, and
Shield.
NOTE Use the same polarity throughout the network segment.
4 Verify that the MSTP jumper is set to MSTP.