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OpenLNS Programmer's Reference 503
open in order for you to access this property. When the
AppDevice object's GetMessagePoint method is called, the
DataPoint object that is created can set this property to send
a request message to the device monitored by this
MsgMonitorPoint object.
The AutoWrite property of this DataPoint object is set to
False; therefore, you need to explicitly propagate the message
to the network after the DataPoint object's Value, RawValue ,
or FormattedValue property is set. You can do this in two
ways:
• Call the DataPoint object's Write method to receive a
response via the OnMsgMonitorPointUpdateEvent event
(i.e. asynchronous response).
• Call the MsgMonitorPoint object's SendMsgWait method
with this DataPoint as the object to receive a response as
the return of the SendMsgWait method (i.e. synchronus
response).
You can use the OutputDataPoint property to send a message
that does not require a response.
Availability
Local, full, lightweight, and independent clients. Note that
temporary MonitorSet objects and temporary monitor points
are not available on Independent clients.
Syntax
dpObject = msgMpObject.RequestDataPoint
Element
Description
dpObject
The DataPoint object returned.
msgMpObject
The MsgMonitorPoint object to be acted
on.
Data Type
DataPoint object.
Read/Write
Read/write.
Added to API
LNS Release 3.0.