APPENDIX B — OPTIONAL BACNET COMMUNICATIONS WIRING (cont)
CONFIGURING THE BAS PORT FOR BACNET MS/ TP — Use the same baud rate and communication settings for all controllers on the network segment. The UPC Open con- troller 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 termi- nals 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
Table A — SW3 Protocol Switch Settings
for MS/TP
DS8 | DS7 | DS6 | DS5 | DS4 | DS3 |
Off | Off | Off | Off | On | Off |
Verify that the
The example in Fig. C 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 appro- priate communications speed of the MS/TP network (9600, 19.2k, 38.4k, or 76.8k bps). See Fig. C and Table B.
Table B — Baud Selection Table
BAUD RATE | DS2 | DS1 |
9,600 | Off | Off |
19,200 | On | Off |
38,400 | Off | On |
76,800 | On | On |
WIRING THE UPC OPEN CONTROLLER TO THE 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.
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Fig. C — DIP Switches
Wire the controllers on an MS/TP network segment in a dai-
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. B, D, and E.
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
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 current- ly 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.
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Fig. D — Network Wiring
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