Version 3.11 | HPI Combi Flow User Guide | 59www.lafert.com
10.3. BACnet MSTP
10.3.1. Overview
HP Combi Flow provides an interface for direct connection to a BACnet MSTP network. Connection is made via the RJ45 connection
port, see section 10.1. RS-485 Communications for terminal assignment and section 10.1.1. RS-485 Communications Electrical
Connections for wiring requirements.
10.3.2. Interface Format
Protocol : BACnet MSTP
Physical signal : RS485, half duplex
Interface : RJ45
Baudrate : 9600bps, 19200bps, 38400bps, 76800bps
Data format : 8N1, 8N2, 8E1, 8O1
10.3.3. BACnet MSTP Parameters
The following parameters are used to configure the drive when connecting to a BACnet MSTP network.
Par. Parameter Name Description
P1-12 Control Source Set this parameter to 6 to activate BACnet MSTP operation.
P5-01 Drive Address
This parameter is used to set the drive address on the BACnet network. Each drive on a given
network should have a unique value. By default, all drives are set to MAC ID 1.
P5-03 Baudrate
This parameter is used to set up communication baudrate. It should be set to match the chosen
baudrate of the BACnet system. Auto baudrate is not supported.
P5-04 Data Format
Use this parameter to set RS485 communication data format. Possible settings are as follows:
n-1 : No parity, one stop bit (default setting)
n-2 : No parity, two stop bits
O-1 : Odd parity, one stop bit
E-1 : Even parity, one stop bit
The setting must match the requirement of the BACnet network.
P5-07 Fieldbus Ramp Control
This parameter determines whether the acceleration and deceleration time of the drive is
controlled by the drive internal parameters (P1-03 : Acceleration Time, P1-04 : Deceleration
Time), or controlled directly from the BACnet MSTP network. In most cases, using the drive internal
parameters is the best solution.
P5-09 BACnet Device Instance ID Low P5-09 and P5-10 are used to setup drive device instance ID value.
Instance ID = (P5-10 * 65536) + P5-09. The allowed setting range is Range from 0 ~ 4194304.
Default value is set to 1.
P5-10 BACnet Device Instance ID High
P5-11 Max Master Set BACnet MS/TP max master property, range from 1 ~ 127. Default set to 127.
10.3.4. BACNet MSTP Commissioning
In order to connect the drive and operate on a BACnet MSTP network, the following procedure should be used.
1. Set P1-14 = 101 to allow access to the extended parameters.
2. On each drive, set an unique Drive Address in parameter P5-01.
3. Set the required baudrate in P5-03.
4. Select the required data format in P5-04.
5. Define a unique BACnet Device Instance ID for each drive using parameters P5-09 and P5-10.
6. Select control from BACnet connection by setting P1-12 = 6.
10
Serial Communications
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