Unitronics GW-BAC1 User Manual
The information in this document reflects products at the date of printing. Unitronics reserves the right, subject to all applicable laws, at any time, at its sole discretion, and without notice, to discontinue or change
the features, designs, materials and other specifications of its products, and to either permanently or temporarily withdraw any of the forgoing from the market.
All information in this document is provided "as is" without warranty of any kind, either expressed or implied, including but not limited to any implied warranties of merchantability, fitness for a particular purpose, or
non-infringement. Unitronics assumes no responsibility for errors or omissions in the information presented in this document. In no event shall Unitronics be liable for any special, incidental, indirect or
consequential damages of any kind, or any damages whatsoever arising out of or in connection with the use or performance of this information.
The tradenames, trademarks, logos and service marks presented in this document, including their design, are the property of Unitronics (1989) (R"G) Ltd. or other third parties and you are not permitted to use
them without the prior written consent of Unitronics or such third party as may own them
DOC01002-A5 10/14
GW-BAC1
BACnet Gateway
User Guide
For Interfacing Unitronics PLCs
To Building Automation Systems:
BACnet MS/TP, BACnet/IP, Modbus/TCP.
Unitronics’s BACnet Gateway User Guide Page 2 of 28
The BTL Mark on GW-BAC1 is a symbol that indicates that a product has passed a
series of rigorous tests conducted by an independent laboratory which verifies that
the product correctly implements the BACnet features claimed in the listing.
The mark is a symbol of a high-quality BACnet product.
Go to http://www.bacnetinternational.net/btl/ for more information about the
BACnet Testing Laboratory.
Certifications
BTL MARK – BACNET TESTING LABORATORY
Unitronics
Unitronics’s BACnet Gateway User Guide Page 3 of 28
TABLE OF CONT ENTS
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.
Unitronics
Unitronics’s BACnet Gateway User Guide Page 4 of 28
LIST O F FIGUR ES
Figure 1: BACnet board ....................................................................................................................................................... 6
Figure 2: Power and RS-485 Connections ........................................................................................................................... 7
Figure 3: Modbus RS-485 Biasing Switch on the GW-BAC1 .............................................................................................. 8
Figure 4: Modbus RS-485 End-Of-Line Termination Switch on the GW-BAC1 ................................................................... 9
Figure 5: Connection from GW-BAC1 to RS-485 Field Network ....................................................................................... 10
Figure 6: RS-485 EOL Switch ............................................................................................................................................. 10
Figure 7: Required current draw for the GW-BAC1 .......................................................................................................... 11
Figure 8: Power Connections ............................................................................................................................................ 11
Figure 9: Tools menu on VisiLogic .................................................................................................................................... 12
Figure 10: Tools menu on UniLogic .................................................................................................................................. 12
Figure 11: BACnet Connection MS/TP Screen .................................................................................................................. 13
Figure 12: BACnet Connection IP Screen .......................................................................................................................... 13
Figure 13: BACnet Nodes Screen ..................................................................................................................................... 14
Figure 14: BACnet Map descriptors Screen ...................................................................................................................... 14
Figure 15: Modbus connection RTU Screen ..................................................................................................................... 15
Figure 16: Modbus connection IP Screen ......................................................................................................................... 15
Figure 17: Finish Screen .................................................................................................................................................... 16
Figure 18: File Transfer Screen ......................................................................................................................................... 17
Figure 19: File menu ......................................................................................................................................................... 17
Figure 20: MODBUS RTU configuration ............................................................................................................................ 18
Figure 21: Example of COM initialize ................................................................................................................................ 18
Figure 22: Example of Modbus configuration .................................................................................................................. 19
Figure 23: Example of MODBUS TCP/IP configurator ....................................................................................................... 19
Figure 24: Example of TCP/IP card and socket initialize ................................................................................................... 19
Figure 25: Example of TCP/IP card and socket initialize ................................................................................................... 20
Figure 26: Example of MODBUS Command ...................................................................................................................... 20
Figure 27: Ethernet Port Location..................................................................................................................................... 21
Figure 28: PC IP configuration .......................................................................................................................................... 21
Figure 29: Changing IP Address via FST Web GUI ............................................................................................................. 22
Figure 30: Ethernet Port Location..................................................................................................................................... 24
Figure 31: Diagnostic tool – device selection ................................................................................................................... 24
Figure 32: Diagnostic selection ......................................................................................................................................... 25
Figure 33: Diagnostic tool – start diagnostic .................................................................................................................... 25
Figure 34: Diagnostic tool –diagnostic test complete ...................................................................................................... 26
Figure 35: Diagnostic LEDs ................................................................................................................................................ 27
Figure 36: Specifications ................................................................................................................................................... 28
Unitronics
Unitronics’s BACnet Gateway User Guide Page 5 of 28
1
1 INT RODUCTION
1.1 GW-BAC1 Gateway
The GW-BAC1 is an external, high performance Building Automation multi-protocol gateway that has been
preprogrammed for enabling Unitronics products (hereafter called “device”) to various building automation
protocols. These protocols include BACnet®1MS/TP and BACnet/IP2. Configuration for the various protocols is
done via Unitronics configuration tool UniBACnet Configurator.
1.2 Record Identi fic atio n Data
Each GW-BAC1 has a unique serial number located on the underside of the unit. This number should be
recorded, as it may be required for technical support.
1.3 Technical Sup port
For technical support and questions concerning setting up the GW-BAC1 to work with a Unitronics PLC
(e.g. Vision, UniStream etc.) please contact Unitronics technical support at support@unitronics.com .
BACnet is a registered trademark of ASHRAE
Unitronics
Unitronics’s BACnet Gateway User Guide Page 6 of 28
2 INT ERFACIN G GW-BAC1 TO DEVIC ES
2.1 GW-BAC1 Showing Con nect ion Ports
Figure 1: BACnet board
Unitronics
Unitronics’s BACnet Gateway User Guide Page 7 of 28
Device Pins
GW-BAC1 Pin #
Pin assignment
Pin RS-485 +
Pin 1
RS-485 +
Pin RS-485 -
Pin 2
RS-485 -
Pin GND
Pin 3
RS-485 GND
Power In (+)
Pin 4
V +
Power In (-)
Pin 5
V -
Frame Ground
Pin 6
FRAME GND
2.2 Connec tin g a Unit ronics P LC to the GW-BAC1 vi a Mo dbu s RS -485
GW-BAC1 6 Pin Phoenix connector for RS-485 Device
The 6 pin Phoenix connector is the same for GW-BAC1.
Pins 1 through 3 are for Modbus RS-485 devices.
o The RS-485 GND (Pin 3) is not typically connected.
Pins 4 through 6 are for power. Do not connect power (wait until Section 3.4).
Figure 2: Power and RS-485 Connections
Unitronics
Unitronics’s BACnet Gateway User Guide Page 8 of 28
RS-485 Bias Switch
2.2.1 Biasin g the M odbu s RS -485 Networ k
An RS-485 network with more than one device needs to have biasing to ensure proper communication.
The biasing needs to be done on one device.
The GW-BAC1 has 530 Ohm resistors that can be used to set the biasing. The GW-BAC1’s default positions
from the factory for the Biasing jumpers are OFF.
The OFF position is when the 2 RED biasing jumpers straddle the 4 pins closest to the outside of the board of the GWBAC1. See Error! Reference source not found..
Only turn biasing ON:
o IF the BMS cannot see more than one device connected to the GW-BAC1
o AND you have checked all the settings (Modbus COM settings, wiring, and DIP switches).
To turn biasing ON, move the 2 RED biasing jumpers to straddle the 4 pins closest to the inside of the
board of the GW-BAC1.
Figure 3: Modbus RS-485 Biasing Switch on the GW-BAC1
Unitronics
Unitronics’s BACnet Gateway User Guide Page 9 of 28
2.2.2 End of Line T erm inat ion Swi tch for the Modbus RS-485 port on the GW- BAC 1
On long RS-485 cabling runs, the RS-485 trunk must be properly terminated at each end.
The GW-BAC1 has an End Of Line (EOL) blue jumper. The default setting for this Blue EOL switch is OFF
with the jumper straddling the pins closest to the inside of the board of the GW-BAC1.
o On short cabling runs the EOL switch does not to need to be turned ON.
If the GW-BAC1 is placed at one of the ends of the trunk, set the blue EOL jumper to the ON position
straddling the pins closest to the outside of the board of the GW-BAC1.
Always leave the single Red Jumper in the A position (default factory setting).
Modbus RS-485 EOL Switch
Leave in A Position
Figure 4: Modbus RS-485 End-Of-Line Termination Switch on the GW-BAC1
Unitronics
Loading...