Echelon LNS DDE Server - Manual (Page 73)

Each component of the Item format has the following meaning:
device_name
Required. The name of a device, as defined in the LNS
database.
lm_name Required if the LMNV topic is used. The name of the
L
ON
M
ARK
Object as defined in the LNS database.
nv_name Required. The name of the network variable on the device,
as defined in the LNS database.
array_index Required if the network variable is an element in an array of
network variables, array_index is the array index in
square brackets.
field_name Optional. A field within a structured network variable.
Fields may be within nested structures. Fields are only
available for structured SNVTs and for user-defined types
defined in a user resource file. The field name must be a
parameter contained within a ‘text’ format definition in the
format file for either a SNVT or a user-defined type. A
master list of SNVTs is contained in the LNS Utilities and
LonMark Reference help file included with the LNS DDE
Server. For a user-defined structured data type, the field
names are as defined in a user resource file. The field
cannot be a union.
Parameters Optional. Multiple parameters can be specified. For each
parameter, zero or more spaces can separate the parameter
and its argument.
The parameter options are:
-a bool
For a variable monitored by polling, this option specifies
whether the poll messages should be sent with authenticated
service. May be set to True or False. The default is the
setting specified for the network in the Network
Configuration dialog.
-b bool For a variable monitored by polling, this option specifies
whether to use bound updates. May be set to True or
False. The default is the setting specified for the network in
the Network Configuration dialog. This option only applies
to output network variables on the monitored devices.
-i nnnnn For a variable monitored by polling, this option sets the poll
interval in tenths of a second, where nnnnn is a number
between 1 and 33554431. The default is the setting specified
for the network in the Network Configuration dialog.
LNS DDE Server User's Guide 5-3