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FS-8700-73 BACnet MSTP Driver Manual
Appendix C.2.
Stat
Link Control
Unsupported
Properties
Segmentation
Not Supported
Sequence Error
Write
Access
Denied
Exception
Errors
Appendix A.1.
If there are multiple FieldServers or third party devices on a BACnet Network each with multiple
Server nodes a unique network number must be assigned to each device.
communication between the BACnet Client and all Servers.
For MSTP devices the network number is provided by the router.
A consequence of this is that when you configure a MSTP client you must know not only the Node_ID
of the server node but you need to know the network number. These are specified on the node
descriptor for client applications as Node_ID and Network_Number. If the network number is not
specified then the node is assumed to exist on the local segment.
Another consequence of this is that the network number is not relevant for server configurations.
The network number is a 16 bit positive number. To override the FieldServer's default network
number 5, refer to Section 5.1
Appendix C.3.
Corporation.
When an ALC module is powered up, and it does not detect valid BACnet/MSTP traffic on its MSTP
port, then the module goes into a terminal mode and MSTP communications will never happen.
When connecting the FieldServer to an ALC BACnet/MSTP module, always start the FieldServer first.
Wait until the RUN Led is flashing on the FieldServer before powering up the MSTP module.
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262-2299 Fax: (408) 262-9042 Toll Free: (888) 509-1970 email: support@fieldserver.com
BACnet Specific Statistics
Description
A "who-is" link control message
was sent or received.
A request for an unsupported
property was received.
Data
was
requested
response would have exceeded the
maximum size of the APDU and
could not be sent using an un-
segmented message.
Invoke ID of a reply did not match
the Invoke ID of the poll.
A write to an object was denied.
A BACnet Service was denied
because it is not supported
Network Number
Known problems with third party devices - Automated Logic
Resolution
It is normal to receive a few link control
messages. If the number is higher than the
transmit/receive messages, however, there
may
be
communications..
This is not an error. BACnet clients often
poll all properties of a particular object to
determine which properties are supported.
but
the
This is not an error - the BACnet client will
use a different method to read data from
the FieldServer.
You should not see this message.
normally indicates a configuration error.
This typically happens when trying to write
to an Input Object that is not Out-Of-
Service. It is not possible to write to Input
Objects.
This may be a problem on the Client
system.
Consult the PIC statement to
determine what services are supported.
Page 21 of 24
a
problem
with
This will ensure
lost
It
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