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7
# Name
Default
Range
Description
1
MAC ADDRESS
1
1…127
2
BAUD RATE
1
0 - Auto
1 – 9600 baud
2 – 19200 baud
3 – 38400 baud
4 – 76800 baud
Communication speed
3
INDEX NR.
Counting
number
0-65535
Instance Number. Zero means that
unique default device object instance
number is used.
4
Comm. time-out
10 s
0 = OFF
10 – 60 s
Communication time-out
0 = Not in use
Table 7-1. BACnet option board parameters
7.3.1
MS/TP MAC address (P7.x.1.1)
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 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 use by the MS/TP router and 255 is
reserved for broadcasts.
7.3.2
Baud rate (P7.x.1.2)
Select the communication speed for the network. Default value is 9600 baud. 0 (– Auto)
means that automatic baud rate detection is used. The used Baudrate is shown in monitor
menu.
7.3.3
Instance number (P7.x.1.3)
The Device Object's Instance number must be unique across the entire BACnet internetwork
because it is used to uniquely identify the BACnet devices. It may be used to conveniently
identify the BACnet device from other devices during installation.
If 0 (default) is selected, the Device Instance number is read from Drive. This unique number
is then shown in Monitor menu. If any other value than zero is selected, the value is used as
Device Object’s Instance number. The actual value is shown in monitor menu.
7.3.4
Communication time-out
BACnet board initiates a communication error if the communication is broken for as long as
defined by the parameter Communication time-out. Communication time-out is disabled
when the parameter is given the value 0. The step for setting the time-out time is 10 seconds.
