10.4 BACnet Communication
10.4.1 What is BACnet Communication?
BACnet (Building Automation and Control network) is a communication network frequently used in
building automation. BACnet introduces the concept of object-oriented systems, and defines
standardized objects. By exchanging data, this function makes communication possible between
products from different companies. It also standardizes some of the general services carried out by
using these standard objects.
10.4.2 BACnet Communication Standards
5 Pin Pluggable connector
RS-485 MS/TP, Half-duplex
Twisted pair (1 pair and shield)
Stated in ANSI/ASHRAE Standards 135-2004
Supports 9600, 19200, 38400, 76800 bps
10.4.3 BACnet Quick Communication Start
Follow the instructions below to configure the BACnet network
1 Set five multi-function input terminals (IN-65–71 PxDefine) to ‘Interlock 1’ – ‘Interlock 5’
respectively, in the correct motor order.
2 Set the Device Object Instances for COM-21 and 22 and define the values. The device object
instances must have unique values.
3 Set COM-01 (Int485 St ID) by entering a value (for BACnet, the Int485 station ID must be set within a
range of 0–127). The station ID value set at COM-01 must be within the value range defined by the
Max Master Property of different Master for MS/TP token passing.
4 Test the network and make sure the BACnet communication is working properly.
Note
•
When auto change mode selection (AP1–55) is set to ‘0 (None)’ or ‘1 (Aux)’, and if 5
motors are operated, including the main motor, the interlock numbers 1,2,3,4,5 refer
to the motors connected to Relay 1,2,3,4,5 (If interlock numbers 1,2,3,4,5 are
connected to Relay 1,2,3,4,5 at the inverter output terminal).
•
If auto change mode selection (AP1-55) is set to ‘2 (Main)’, and the main and auxiliary
motors are connected to the inverter output terminal Relay 1,2,3,4, Interlock 1,2,3,4
are the motors connected to Relay 1,2,3,4. Set COM-04 Int485 Mode.
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