Echelon LonMaker - Manual (Page 138)

122 Designing Networks
The following flow chart demonstrates the process the LonMaker tool uses to select the appropriate
SCD.
Start
Unicast?
All targets on
same subnet?
# of targets
< Z ?*
SCD_Unicast
Acknowledged service
Aliases for selector conflicts
Does not use broadcast
SCD_SubnetBcast
Repeated service (3 repeats)
Aliases for selector conflicts
Subnet broadcast
SCD_AliasUnicast
Acknowledged service
Alias multi-unicast
Does not use broadcast
SCD_Default
Repeated service (3 repeats)
Aliases for selector conflicts
Domain broadcast
Group available?
SCD_Default
Repeated service (3 repeats)
Aliases for selector conflicts
Does not use broadcast
* Z = 5 by default
No
No
No
No
Yes
Yes
Yes
Yes
These automatic SCD selection rules do not apply to message tag connections, fan-in
connections (where the hub is an input network variable), or connections in which you specify
a non-SCD for the connection description.
You can modify the automatic SCD selection rules by opening the LonMaker menu, clicking
LonMaker Options, and then selecting the Smart Connection Descriptions options category. The
network properties: Smart Connection Descriptions options category is not available from the
LonMaker Default Options tab in the LonMaker Design Manager.