Echelon LNS DDE Server - Manual (Page 88)

Specifying a Configuration Property
Configuration properties may be associated with a device, L ON M ARK object, or
network variable. For example, a configuration property associated with a L ON M ARK
object for a sensor may define the processing for the sensor data; a configuration
property associated with an output network variable may specify the override value
for the network variable. To access a configuration property, you must select the
type of configuration property in the DDE Topic, and the specific configuration
property in the DDE Item.
Specifying a Configuration Property Topic
The LNS DDE Server uses the configuration property topics to send and receive
information about configuration properties. There are four configuration property
topics: DevCP; DevNVCP; LMCP; and LMNVCP. Within the configuration
property topic, the LNS DDE Server requires 2-4 pieces of information to be able to
identify a configuration property. How much information it needs depends on what
type of configuration property topic it is.
A configuration property topic is specified using the standard topic format or custom
topic format described in Chapter 4. The topic type will be one of the following
configuration property topics:
Category Topic Type Description
Configuration
Property DevCP Configuration properties for a device.
LMCP Configuration properties for a L ON M ARK object.
LMNVCP Configuration properties for a network variable
member of a L
ON M ARK object.
DevNVCP Configuration properties for a network variable on a
device. This type accesses configuration properties for
network variables on a device that are not members of
a L
ON M ARK object.
NVCP Configuration properties for a network variable. As
with the NV topic type, any network variable may be
specified. The network variable name may be
ambiguous when specified using this topic type.
Specifying a Configuration Property Item
A configuration property item identifies a device and a configuration property or
configuration property field on the device.
The format for specifying this information is the following:
device_name[.lm_name][.nv_name[[array_index]]].cp_name[.field_n
ame] [parameters]
6-2 Reading and Writing Configuration Properties