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FS-8700-16 BACnet PTP Serial Driver Manual Page 17 of 20
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
Appendix C. Troubleshooting Tips
Appendix C.1. Debugging a BACnet connection – Hints and Tips
• Disconnect the FieldServer from the BACnet network when transferring images to the BCU.
• If duplicate object instances are accidentally configured in the FieldServer, the second call of
the instance will overwrite the first one. This may cause a BACnet Object to be “lost.”
• If “Virtual_BCU_…” is not being indicated as the device description for the FieldServer on the
BACnet SCADA system, then the FieldServer is not communicating with the SCADA system.
If the present value’s name is being indicated, but the present value shows question marks,
then it is most likely that the Client side of the FieldServer is not communicating.
• When new points are added to the FieldServer it is important to restart the Summit
Workstation or BCU, otherwise these new points may not be seen by the FieldServer.
•
Polling BACnet addresses that are not configured for Lieberts systems may cause the
connection to fail in older versions of Lieberts. Please contact your Lieberts supplier for
more information.
•
When a BACnet_PTP connection is established, and the connection is broken abruptly
(for instance a power down), the BCU might not know immediately that this happened. If
the FieldServer is the powered up again, it might take several seconds (up to 60
seconds) before polling will start again.
•
Extra memory is required to store Map Descriptors that have the active/inactive text
parameters specified. If the defaults are appropriate, do not specify these parameters.
This will save memory and allow more Map Descriptors to be created
• McQuay Units are shipped with a default Device instance of the last 6 digits of the McQuay
Serial number.
Trane Specific Tips
• When new points are added to the FieldServer it is important to restart Summit Workstation
or BCU, otherwise these new points may not be seen by the FieldServer.
• Disconnect the FieldServer from the BACnet network when transferring images to the BCU
Appendix C.2. BACnet Specific Statistics
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, 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
Writing 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
This may be a problem on the Client
system. Consult the PIC statement to
determine what services are supported.