Echelon OpenLNS - Manual (Page 294)

OpenLNS Programmer's Reference 257
SourceNodeId
Summary Indicates the node ID of the device making a network
variable update to a host network variable.
This value is only meaningful if the network variable being
monitored is a host network variable. This property, along
with the SourceSubnetId property, allows a number of
devices on the network to each have a network variable
explicitly bound to a single network variable on the host.
Once the network variable has been bound and monitoring is
turned on using the MonitorTag property,
OnNetworkVariableUpdate events will indicate that the host
network variable was updated. The SourceSubnetId and
SourceNodeId properties can then be used to determine
which of the devices on the network updated the host
network variable.
For high performance when using monitor and control, you
can use a temporary or permanent monitor point with a
defined tag for each remote network variable. You could use
the tag to identifiy the network variable source directly,
without having to translate the source subnet/node ID.
Availability Local, full, and lightweight clients.
Syntax nodeId = dvObject.SourceNodeId
Element Description
nodeId The node ID of the device which sent a
network variable update.
dvObject The DataValue object to be acted on.
Data Type Integer
Read/Write Read only.
Added to API Prior to LNS Release 3.0.