Echelon OpenLNS - Manual (Page 529)

OpenLNS Programmer's Reference 492
with the Write method
because it reduces the time
required to update the
values on the network.
FALSE. OpenLNS waits for the
completion code to return
after it sends each value
before returning from the
method, as with LNS
versions prior to LNS 3.20.
Other client applications will
be able to successfully
update the monitor point
while your application is
waiting for the completion
code.
If this property is set to
False and no completion code
is returned after a message
is sent, this indicates that
OpenLNS failed to update
the monitor point. In this
case, the DS, #411
lcaErrLnsDsWriteFailed
exception will be thrown
before OpenLNS proceeds to
the next update message.
OpenLNS will not return
any events confirming that
the value has been updated
when the property is set to
False.
This is the default.
Data Type Boolean.
Read/Write Read/write.
Note: OpenLNS sets this property automatically for message
monitor points. For example, if you are sending a message
via the SendMsgWait method, a response from the device is
expected. Therefore, OpenLNS will set the UseAsyncSend
property to False.
Also, if you are writing to a message monitor point via the
SendMsgWait property, no response is expected; therefore,
OpenLNS sets the property to True. As a result, you should
not write to this property when you access it through a
MsgMonitorOptions object.
Added to API LNS Release 3.20.