Echelon OpenLNS - Manual (Page 201)

OpenLNS Programmer's Reference 164
a SNVT_xxx type, it will be formatted as specified by the
format file.
2. If the ConfigProperty object’s type does not appear in the
Device Resource File Type and Format files, or if it
appears but is designated as a SNVT_xxx type, the
OpenLNS Server will check to see if it applies to a
standard network variable. If it does, it will be formatted
according to the SNVT format specification in
STANDARD.FMT.
3. As a third option, OpenLNS will use the Hex Byte String
format as the default. In this case, each byte of the raw
value assigned to the ConfigProperty object will be
displayed as two hexadecimal digits. For example, the
byte sequence 1,2,3,4 would be displayed as 01020304.
Overriding the Best-Guess Format
When you successfully write to this property, the new value
will be stored persistently in the OpenLNS database.
However, you can revert the property back to the default
value chosen by OpenLNS at any time by writing an empty
string or the exact name of the type (e.g. SCPTmaxFlow) to
it. There are several possible syntaxes you can use when
writing to this property if you want to override the best-guess
format:
1. A format name beginning with "SCPT" for standard type
formats or "UCPT" for user-defined type formats (e.g.,
"SCPTmaxFlow"). The Data Server will use the resource
file catalog specified using the LdrfCatalogPath property
to search for SCPT and UCPT formats. There may be
several different formats for the same network variable
type. For example, the LonMaker Integration Tool has
two alternate formats for the type SCPTmaxFlow, and
those formats are named SCPTmaxFlow#SI and
SCPTmaxFlow#US.
In OpenLNS, the default formats for types such as
SCPTmaxFlow are determined using the Windows
regional settings of the computer where the data is
formatted (on the computer housing the OpenLNS Server
for local and lightweight clients, or on the computer
running the application for full clients). To determine
the settings being used on a computer, open the Windows
Control Panel and double-click the Regional Options icon.
Select the Numbers tab. OpenLNS uses the value of the
Measurement System field (either U.S. or metric) on this
tab to determine the default format to use for types such
as SCPTmaxFlow. You can also specify a full format
name (e.g. SCPTmaxFlow #SI or SCPTmaxFlow#US) to
select a specific format for that type. For UNVTs, you
must always specify a fully-qualified format name.
2. In some cases, a format exists for a given SCPT or UCPT