FieldServer FS-8700-73 - Manual (Page 34)

FS-8700-73 BACnet MSTP Driver Manual Page 34 of 48
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Appendix B. Troubleshooting
Appendix B.1. Debugging a BACnet connection
If duplicate Object_Instances are 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 the Node Name configured on the BACnet Server Side of the configuration is not being indicated as the
Device Name on the BACnet SCADA system, then the FieldServer is not communicating with the SCADA
system. If the Device Object's name is being indicated, but the Present_Value shows question marks,
then it is likely that the Client side of the FieldServer is not communicating.
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
When a BACnet_MSTP connection is configured as a server, it is better to use connection_type
MSTP_Slave_Node. The only time when a server connection must be a Master_Node is when alarming
has been established on the FieldServer.
When a FieldServer/ProtoCessor is configured to support MSTP virtual server nodes the firmware achieves this
by implementing a virtual router and thus a network number is required so that it can expose its nodes to
external devices as belonging to a specific network. (The default is network 5 if not specified). This
network number is defined on the bridge descriptor as Network_Number. It must be unique for a site.
Refer also to Appendix A.2.
Appendix B.2. COV Configuration
COV has to be enabled if required for MSTP. Refer to Appendix A.7 for more information.
COV only works for BACnet Map Descriptors with length set to 1. If length is not specified, then it defaults to 1,
so this is only a problem where length has been specified as greater than 1.
Appendix B.3. BACnet Specific Statistics