Unitronics’s BACnet Gateway User Guide Page 3 of 28
Unitronics
TABLE OF CONTENTS
1 Introduction ................................................................................................................................................................ 5
1.1 GW-BAC1 Gateway ............................................................................................................................................. 5
1.2 Record Identification Data .................................................................................................................................. 5
1.3 Technical Support ............................................................................................................................................... 5
2 Interfacing GW-BAC1 to Devices ................................................................................................................................ 6
2.1 GW-BAC1 Showing Connection Ports ................................................................................................................. 6
2.2 Connecting a Unitronics PLC to the GW-BAC1 via Modbus RS-485 .................................................................... 7
2.2.1 Biasing the Modbus RS-485 Network ........................................................................................................... 8
2.2.2 End of Line Termination Switch for the Modbus RS-485 port on the GW-BAC1 .......................................... 9
2.3 BACnet MS/TP Field Devices: Wiring Field Port to RS-485 Network ................................................................ 10
2.4 Connecting Power to GW-BAC1 ........................................................................................................................ 11
3 Creating configuration file and configurating the PLC ....................................................................................... 12
3.1 UniBACnet configurator .................................................................................................................................... 12
3.2 PLC configuration example. .............................................................................................................................. 18
4 ChangING the GW-BAC1 IP Address .................................................................................................................. 21
4.1 Connect the PC to GW-BAC1 via the Ethernet Port .......................................................................................... 21
4.2 BACnet/IP: Setting IP Address for Field Network ............................................................................................. 22
Appendix A. Troubleshooting ................................................................................................................................... 23
Check Wiring and Settings ..................................................................................................................... 23 Appendix A.1.
Diagnostic Capture ................................................................................................................................ 24 Appendix A.2.
LED Diagnostics for Modbus RTU Communications Between GW-BAC1 and Devices .......................... 27 Appendix A.3.
Appendix B. Reference ............................................................................................................................................. 28
Specifications ......................................................................................................................................... 28 Appendix B.1.
Compliance with UL Regulations ........................................................................................................... 28 Appendix B.2.
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