FieldServer FS-8700-73 - Manual (Page 19)

FS-8700-73 BACnet MSTP Driver Manual Page 19 of 48
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Appendix A. Useful Features
Appendix A.1. BACnet object names
When an external BACnet Client builds a list of Object Names, the BACnet Server Map Descriptor names determine
the BACnet Object Name. If the Map Descriptor length is greater than 1, the Object Name will be suffixed with the
index into the Map Descriptor. For example, if the Map Descriptor name is SMD_AI_01 and the length 3, then the
Object Names will be SMD_AI_01[0], SMD_AI_01[1] and SMD_AI_01[2].
It is important that unique Map Descriptor names are created for each device to ensure that the Object Names are
unique.
Appendix A.2. Network number
If multiple BACnet Nodes are specified on the Server side, the FieldServer automatically defaults to virtual
operation. In effect, the FieldServer simulates a software router. BACnet identifies this FieldServer using a
combination of it’s network number and IP/MAC address. The default Network number of a FieldServer is 5. If
there is more than one FieldServer on a BACnet intranet with multiple nodes, the default network number of the
additional FieldServers will need to be changed and a unique number allocated to each.
A unique network number will need to be assigned if both of the following conditions are true:
The FieldServer has multiple BACnet Server nodes.
There is more than one FieldServer on a network which includes multiple BACnet nodes.
To override the FieldServer’s default network number 5 include the following in the configuration file:
Section Title
Bridge
Column Title
Function Legal Values
Title FieldServer name Text
Network_number* Specify a unique network number if there are multiple virtual Server nodes. 1-65534, 5
Example
// FieldServer Driver specific parameters
Bridge
Title , Network_Number
BACnet Server , 6
Note: While it is theoretically possible to have up to 65535 virtual nodes, it is recommended that a maximum of 32
is configured. If an application requires the configuration of more than 32 virtual nodes please consult FST.
Note 2: If an application demands multiple BACnet IP Server nodes and multiple BACnet MSTP Server Nodes
simultaneously, they will at present all appear with the same virtual network number. This creates a potential
conformance problem if there is an external BACnet router connecting the BACnet IP and BACnet MSTP networks
to which the FS is also connected, as duplicate virtual networks with the same network number would then exist in
the BACnet network, which is not permitted. Please contact FST for assistance.