Echelon LNS DDE Server - Manual (Page 57)

• Control the update rate of bound network variables. Network variables should
generally only be bound if they will change infrequently. If there is a possibility
that several network variables bound to the host will begin rapidly changing,
slow the update rate to avoid saturating the network. For example, the update
rate can be limited on many devices using the minimum send time standard
configuration property type (SCPTminSendTime).
The default setting for Use Bound Updates is off. You can override the binding
option for an individual network variable with the -b switch.
All temporary network variables and connections are removed automatically by the
LNS DDE Server when the point is deleted, unless you have selected the Bound
Updates Persistent option. Select this option if you have specified a large
number of bound updates, otherwise it can take a long time to delete the points or
exit the server.
Creating message tags on the host and binding to them is not supported by the LNS
DDE Server.
Use Priority Messages
When enabled, this setting specifies that the LNS DDE Server will use priority
messages for outgoing application messages and network variable updates. The
default setting is Off.
You can override the priority option for an individual network variable or application
message with the -p switch.
Number of Retries
This setting specifies the default number of retries to use for outgoing application
messages and network variable updates that use the Repeated or Acknowledged
service. When using the Acknowleged service, the number of retries specifies the
maximum number of times that the LNS DDE Server will resend a network variable
update or application message when an acknowledgement is not received within the
time specified by the Reply Timeout setting. When using the Repeated Service, the
number of retries specifies the number of times that every network variable update
or application message will be repeated. The default number of retries is three (3).
You can override the number of retries for an individual network variable or
application message with the -r switch.
Reply Timeout (1/10 sec)
This setting specifies how long the LNS DDE Server will wait for an
acknowledgement to an acknowledged update before retrying the operation. The
value is specified in tenths of a second. For example, a value of 5 specifies that the
LNS DDE Server will wait for 0.5 seconds before retrying an update. The default
reply timeout is 30 (3 seconds).
LNS DDE Server User's Guide 3-25