FS-8700-21 LonWorks Manual Page 17 of 72
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: [email protected] 7.1.5 Network Management
The NVPIEXC command generally used for polling has the limitation that data can only move in one direction (Server to
Client). The added functionality of a Write-through was added to the network management fetch command (NMFETCHC) to
provide movement of data back to the polled node. Thus, should the data in the Data Array linked to a NMFETCHC Map
Descriptor change by another process, the data will be propagated to the polled node by means of a network variable
update.
Another useful feature of the NMFETCHC function is that it can perform reads to any other type of Node function (NVUI,
CFG_NVUI, NVUOEXX, NVPIIMC, etc.) This means that even Client Map Descriptors can be read this way.
Network management fetch requests received on polled nodes are handled differently from normal NV Poll requests. The
response to a NV Poll will contain valid data. Data is valid if the node that is the source of the data is online and if this data is
not too old. The data in the response to a network management fetch will not be checked for validity, however, it will simply
respond with the current data in the variable.
7.2 Client Side Configuration
7.2.1 Client Side Connection Parameters
Example
// Client Side Connections
7.2.2 Client Side Node Parameters
Up to 32 alphanumeric
characters
Server (destination) Node’s Subnet ID of an explicitly addressed
message
Server (destination) Node’s Node ID of an explicitly addressed message
Initiate a send on startup. Refer to Appendix A.3 for more information
