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Programming
5.3
BACnet MS/TP parameter descriptions
5.3.1
BACnet MS/TP Parameters
P5.7.3.1.1
B
AUD RATE
Select the communication speed for the network. The default value is 9600 baud. If value
is chosen this parameter is not editable.
P5.7.3.1.2
A
UTOBAUDING
NOTE! This function is only used at start-up.
This function is set off by default. If the parameter is given value 1 the automatic baud rate de-
tection is used. The automatically detected baud rate is then shown as value of parameter
.
P5.7.3.1.1 Baud rate
P5.7.3.1.3
MAC
The parameters of every device must be set before connecting to the bus. Especially the pa-
rameters
MAC address
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 instal-
lation 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. 255 is re-
served for broadcasts.
P5.7.3.1.4
I
NSTANCE NUMBER
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 iden-
tify the BACnet device from other devices during installation.
If 0 (default) is selected, the Device Instance number is read from the VFD. This unique number
is then shown in the 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 the Monitor menu. The de-
fault value for this parameter is generated from the Ethernet MAC address. Last 2 octets will
be used. XX.XX.XX.XX.FF.FF.
P5.7.3.1.5
C
OMMUNICATION TIME
BACnet board initiates a communication error if the board is a "sole master" in the network for
a time defined with this parameter. '0' means that no fault is generated.
ADDRESS
and
must be the same as in the master's configuration.
Baud rate
-
OUT
Honeywell • 20
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