Echelon OpenLNS - Manual (Page 631)

OpenLNS Programmer's Reference 594
was used for pre-LonMark resource
files.
nvObject The NetworkVariable object to be acted
on.
Data Type String.
Read/Write Read/write.
Added to API Prior to LNS Release 3.0.
DsIsDefaultFormat
Summary Indicates whether the network variable is using its default
format .
OpenLNS determines the default format to use for SNVT
network variables by reading the SNVT ID of the network
variable, and using it to locate the applicable entry for that
SNVT type in the standard resource files. OpenLNS then
reads the default type from the resource file.
OpenLNS determines the default type to use for UNVT
network variables on LonMark objects by reading the
Functional Profile Template of the LonMark object and
locating the applicable entry for the UNVT type in the
user-defined resource files, based on the NV members
contained within the FPT. Once this is done, it reads the
default type for the UNVT from the resource file entry.
UNVT network variables that are not on LonMark objects
default to the type "RAW."
If OpenLNS cannot read the format files, or if it is unable to
determine a network variable’s default format for any reason,
the format assigned to the network variable will be "RAW."
The
LdrfCatalogPath of the System object must point to the
actual location of the LonMark Device Resource File catalog
for OpenLNS to read the format files.
You can change the format assigned to a network variable by
writing to its DsFormatType property. You can restore the
default format to a network variable at any time by writing
an empty string to the DsFormatType property. Once you
have done so, the DsIsDefaultFormat property will return
True.
Availability Local, full, and lightweight clients.
Syntax isDefault = nvObject. DsIsDefaultFormat
Element Description
isDefault A Boolean value, which depends on the
value returned by the DsFormatType
property.
TRUE. The DsFormatType property is
the same as the network