Installation Manual

Communications
84 H-Max HVAC Drives MN04008006E—January 2012 www.eaton.com
BACnet MS/TP Parameter Descriptions
BACnet MS/TP Parameters
P4.7.3.1.1 Baud Rate
Select the communication speed for the network. The
default value is 9600 baud. If value Auto is chosen this
parameter is not editable.
P4.7.3.1.2 Autobauding
This function is set off by default. If the parameter is given
value 1 the automatic baud rate detection is used. The
automatically detected baud rate is then shown as value of
parameter P4.7.3.1.1 Baud Rate.
P4.7.3.1.3 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 use
by the MS/TP router. 255 is reserved for broadcasts.
P4.7.3.1.4 Instance 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 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 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 default value for this
parameter is generated from the Ethernet MAC address.
Last 2 octets will be used. XX.XX.XX.XX.FF.FF.
P4.7.3.1.5 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. “0” means that no fault is generated.
BACnet MS/TP Monitoring Values
P4.7.3.2.1 Fieldbus Protocol Status
Fieldbus Protocol Status tells the status of the protocol.
P4.7.3.2.2 Communication Status
The Communication status shows how many error and how
many good messages the frequency converter has received.
The Communication status includes a common error counter
that counts CRC and parity errors and a counter for good
messages.
Only messages to the current slave in use are counted in the
good messages, not MS/TP token packages.
BACnet MS/TP—Good Messages
BACnet MS/TP—Bad Frames
P4.7.3.2.3 Actual Instance Number
Shows the actual instance number.
P4.7.3.2.4 Fault Code
Shows BACnet MS/TP fault codes.
P4.7.3.2.5 Control Word
Shows the Control Word received from the bus.
P4.7.3.2.6 Status Word
Shows the current Status Word that is sent to the bus.
Code Description
0–999 Number of messages received without errors
Code Description
0–99 Number of messages received with errors