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Optional UPC Open Installation
WIRING THE UPC OPEN TO THE MS/TP NETWORK
The UPC Open controller communicates using BACnet
1
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. Wire specifications for the cable are 22 AWG
(American Wire Gage) or 24 AWG, low-capacitance, twisted,
stranded, shielded copper wire. The maximum length is 2000 ft.
Install a BT485 terminator on the first and last controller on a net-
work segment to add bias and prevent signal distortions due to
echoing. See Fig. 61-63.
To wire the UPC Open controller to the BAS network:
1. Pull the screw terminal connector from the controller's BAS
Port.
2. Check the communications wiring for shorts and grounds.
3. Connect the communications wiring to the BAS port’s screw
terminals labeled Net +, Net -, and Shield.
NOTE: Use the same polarity throughout the network
segment.
4. Insert the power screw terminal connector into the UPC
Open controller's power terminals if they are not currently
connected.
5. Verify communication with the network by viewing a module
status report. To perform a module status report using the
BACview keypad/display unit, press and hold the “FN” key
then press the “.” key.
To install a BT485 terminator, push the BT485 on to the BT485
connector located near the BACnet connector.
NOTE: The BT485 terminator has no polarity associated with it.
To order a BT485 terminator, consult Commercial Products i-Vu
®
Open Control System Master Prices.
Fig. 61 — UPC Open Controller
IMPORTANT: A shorted CCN bus cable will prevent some
routines from running and may prevent unit from starting. If
abnormal conditions occur, unplug the connector. If conditions
return to normal, check CCN connector, and run new cable if
necessary. A short in one section of the bus can cause prob-
lems with all system elements on the bus.
1. BACnet is a registered trademark of ASHRAE (American Society of
Heating, Refrigerating and Air-Conditioning Engineers).
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BACNET
BAUD RATE
DIP SWITCHES
ADDRESS
ROTARY
SWITCHES
POWER LED
RUN LED
ERROR LED
BACNET
CONNECTION
BT485
TERMINATOR
Tx2 LED
Rx2 LED
Tx1 LED
Rx1 LED
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