FieldServer FS-8700-73 - Manual (Page 35)

FS-8700-73 BACnet MSTP Driver Manual Page 35 of 48
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Stat Description Resolution
Link Control
A “who-is” link control message was
send or received.
It is normal to receive a few link control
messages. If the number is higher than the
transmit/receive messages, however, there may
be a problem with lost communications..
Unsupported
Properties A request for an unsupported property
was received
This is not an error. BACnet clients often poll all
properties of a particular object to determine
which properties are supported.
Segmentation
Not Supported
Data was requested but the response
would have exceeded the maximum size
of the APDU and could not be sent using
an un-segmented message.
This is not an error - the BACnet client will use a
different method to read data from the
FieldServer.
Sequence Error
Invoke ID of a reply did not match the
Invoke ID of the poll. You should not see this message. It normally
indicates a configuration error.
Write Access
Denied
A write to an object was denied.
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.
Exception Errors
A BACnet Service was denied because it
is not supported Consult the PIC statement to determine what
services are supported.
Appendix B.4. BACnet Specific Error Messages
Message
Description
Cause Suggested Resolution
Bacnet IP DLL
Temporarily out of
receive buffers
The FieldServer was flooded with more BACnet IP packets
than it could handle. This typically occurs when a
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. Take action only if the error
is continuous in which case
the network load must be
analyzed and corrected.
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