188
APPENDIX E — UPC OPEN CONTROLLER (cont)
Configuring the BAS Port for BACnet MS/TP
Use the same baud rate and communication settings for all con-
trollers on the network segment. The UPC Open controller is
fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's
communications.
If the UPC Open controller has been wired for power, pull the
screw terminal connector from the controller's power terminals
labeled Gnd and HOT. The controller reads the DIP Switches
and jumpers each time power is applied to it.
Set the BAS Port DIP switch DS3 to “enable.” Set the BAS
Port DIP switch DS4 to “E1485.” Set the BMS Protocol DIP
switches DS8 through DS5 to”MSTP.” See Table F.
Table F — SW3 Protocol Switch Settings for MS/TP
Verify that the EIA-485 jumpers below the CCN Port are set to
EIA-485 and 2W.
The example in Fig. J shows the BAS Port DIP Switches set
for 76.8k (Carrier default) and MS/TP.
Set the BAS Port DIP Switches DS2 and DS1 for the appropri-
ate communications speed of the MS/TP network (9600, 19.2k,
38.4k, or 76.8k bps). See Fig. I and Table G.
Table G — Baud Selection Table
Wiring UPC Open Controller to MS/TP Network
The UPC Open 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. 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
network segment to add bias and prevent signal distortions due
to echoing. See Fig. H, J, and K.
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 mod-
ule status report. To perform a module status report using the
BACview keypad/display unit, press and hold the “FN” key
then press the “.” Key.
DS8 DS7 DS6 DS5 DS4 DS3
OffOffOffOffOnOff
BAUD RATE DS2 DS1
9,600 Off Off
19,200 On Off
38,400 Off On
76,800 On On
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