Echelon LNS - Manual (Page 212)

LNS Programmer's Guide 198
6. Get the monitor set you will use to monitor the messages. You should
have first created a monitor set for this purpose, as described in Creating
Monitor Sets. Remember that when adding monitor points to a monitor
set, you should access the set through the MyVni property.
Set MyMonSets = MonVNI.MonitorSets
Set MyMonSet = MyMonSets.Item(“Monitor Set 1”)
7. Access the monitor set’s
MsgMonitorPoints
collection, and call the
Add()
method to add a message monitor point to the monitor set, passing
in the AppDevice selected in step 3 as the
targetDevice
element.
Dim MyMsgPoints As LcaMsgMonitorPoints
Dim MyMP As LcaMsgMonitorPoint
Set MyMsgPoints = MyMonSet.MsgMonitorPoints
Set MyMP =MyMsgMonitorPoints.Add("msgp1",MonVni,nothing)
8. Set the properties of the new
MsgMonitorPoint
object. Two properties
you should initially set are the
Tag
property and the
DefaultOptions
properties. You can use the
DefaultOptions
property to set the default
monitoring options that will be applied to the new monitor point each
time it is enabled. See the LNS Object Server Reference help file for more
information on the
Tag
property, and for a complete list of the properties
of the
MsgMonitorPoint
object. For more information on monitoring
options, see Setting Monitoring Options on page 200.
9. If you are started a transaction in step 2, commit the transaction to the
database.
MySystem.CommitTransaction()
10. You can now enable the monitor point in monitor and control operations.
For more information on this, see Opening and Enabling Monitor Sets on
page 213.
To create a permanent message monitor point to send explicit messages to multiple
devices simultaneously, follow these steps. Note that you cannot use a temporary
message monitor points to send explicit messages to multiple devices simultaneously:
1. Open the
ObjectServer
,
Network
, and
System
you plan to monitor and
control, as described in Chapter 4, Programming an LNS Application.
2. Echelon recommends that you use transactions when creating permanent
message monitor points, as this considerably reduces the time required to
create the monitor points. Transactions should not generally be used
when creating temporary monitor points since they are not stored in the
LNS database, and so starting a transaction would unnecessarily slow
down the process. For more information on using transactions with LNS,
see Using Transactions and Sessions on page 65.
MySystem.StartTransaction()
3. Create a dynamic message tag on your application’s Network Service
Device. You will use this message tag to connect the Network Service
Device to the application devices you want to send messages to. For
instructions on creating dynamic message tags, see Adding Message Tags
To a Custom Interface on page 183.