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BACnet MS/TP—On-Board communication
POWERXL DG1 SERIES VFD
MN040010EN—September 2016 www.eaton.com
BACnet MS/TP Parameters and monitoring values
Table 97. MNdbus RTU/BACneo MS/TP—P20.2
Code
Parameter
Min.
Max.
Unit
Default
ID
Note
P20.2.1
RS485 Comm Set
0
586
0 = Modbus RTU
1 = BACnet MS/TP
P20.2.11
BACnet Baud Rate
2
594
0 = 9600
1 = 19200
2 = 38400
3 = 768000
4 = 115200
P20.2.12
MAC Address
0
127
1
595
P20.2.13
Instance Number
0
4194302
varies
596
P20.2.14
Comm Timeout BACnet
ms
10000
598
P20.2.15
Protocol Status
0
599
0 = Stopped
1 = Operational
2 = Faulted
P20.2.16
Fault Code
0
600
0 = None
1 = Sole Master
P20.2.17
Modbus RTU/BACNet Fault
Response
0
1
0
2516
0 = In Fieldbus Control
1 = in all Control
BACnet MS/TP parameters
Baud Rate
Select the communication speed for the network.
The default value is 38400 baud.
MAC address
The parameters of every device must be set before
connecting to the bus. Especially the parameters MAC
Address and baud rate must be the same as in the master’s
configuration. The first parameter, MAC (Medium Access
Control) address, must be unique on the network to which
it is connected. The same MAC address may be used
on a device on another network within the internetwork.
Addresses 128–254 are reserved for slaves. Addresses
1–127 are valid for both masters and slaves. The portion
of the address space that is actually used for masters
in a particular installation is determined by the value
of the Max_Master property of the device object. It is
recommended that MAC address 0 be reserved for the
MS/ TP router and MAC address 255 is used for broadcasts.
Instance number
The Device Object’s Instance number is used in conjunction
with the MAC address to assign the devices on the
network. The instance number can have up to 127 nodes on
it before a different instance number is required.
Communication time-out
BACnet board initiates a communication error if the board is
a “sole master” in the network for a time defined with this
parameter.
