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
.
Summary of Contents for OPN-VVTZC
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