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FS-8700-73 BACnet MSTP Driver Manual
Stat
Description
A "who-is" link control message was
Link Control
send or received.
Unsupported
A request for an unsupported property
Properties
was received
Data was requested but the response
Segmentation
would have exceeded the maximum size
Not Supported
of the APDU and could not be sent using
an un-segmented message.
Invoke ID of a reply did not match the
Sequence Error
Invoke ID of the poll.
Write
Access
A write to an object was denied.
Denied
A BACnet Service was denied because it
Exception Errors
is not supported
Appendix B.4. BACnet Specific Error Messages
Message
Cause
Description
Bacnet
IP
DLL
The FieldServer was flooded with more BACnet IP packets
Temporarily out of
than it could handle.
receive buffers
workstation discovers a large network resulting in many
Who-Is and I-Am broadcasts. The FieldServer will recover
from this, but some timeout errors could result.
Appendix B.5. BACnet Error Response Decoding
BACnet reports errors in the following format:
T02> 10/22 02:57 HEXDUMP : ERROR_PDU
T02> 10/22 02:57 0x19d2d 50 97 0f 91 02 91 2a
T02> 10/22 02:57 BACnet -> Unexpected ERROR_PDU : err_class=2 err_code=42
These can be decoded using the following tables:
Appendix B.5.1.
BACnet Error CLASS
Device
0
Object
1
Property
2
Resources
3
Security
4
Services
5
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Tel: (408) 262-2299 Fax: (408) 262-2269 Toll Free: (888) 509-1970 email: support@FieldServer.com
Resolution
It is normal to receive a few link control
messages.
transmit/receive messages, however, there may
be a problem with lost communications..
This is not an error. BACnet clients often poll all
properties of a particular object to determine
which properties are supported.
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. It 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.
Consult the PIC statement to determine what
services are supported.
This typically occurs when a
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If the number is higher than the
Suggested Resolution
Take action only if the error
is continuous in which case
the network load must be
analyzed and corrected.
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