Data point formats, Command line switches – Echelon LonPoint Application and Plug-In User Manual
Page 185
The LonPoint Application and Plug-in Guide
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empty field. For example, the following data lines were generated with the Fill
Missing Data
option turned off:
08/04/98,10:44:30,2.380000e+002,1.527428e+003
08/04/98,10:44:30,2.390000e+002,
08/04/98,10:44:30,2.400000e+002,
The following data lines were generated with this option is turned on:
08/04/98,10:44:30,2.380000e+002,1.527428e+003
08/04/98,10:44:30,2.390000e+002,1.527428e+003
08/04/98,10:44:30,2.400000e+002,1.527428e+003
where the first line represents new data for the last column, and the second and
third lines contain “old” data for the last column.
Data Point Formats
Data points are formatted based on the following rules:
If the network variable size is 1 byte then the data is treated as a signed integer.
If the network variable size is 2 bytes and the network variable type is
SNVT_switch
, the data is treated as such and displayed as NN.N B where B is ‘0’
or ‘1’. For any other 2 byte network variable type; the data is treated as a signed
2-byte integer.
If the network variable size is 4 bytes then the data is treated as a floating point
value.
If the network variable size is 29 bytes and the network variable is of the
SNVT_alarm
type, the data is treated as such.
If the network variable size is 31 bytes and the network variable is of the
SNVT_str_asc
type, the data is displayed as a string.
Command Line Switches
When invoking the Data Logger Utility there are several command line switches
that help automate the start up process:
/net Network Name
Opens the specified network.
/ifc Interface Name
Uses the specified network interface.
/sub Subsystem Name
Opens the specified subsystem.
/log Data Logger Name
Accesses the specified Data Logger. Multiple switches
can be used to select more than one Data Logger.
/idle seconds
Causes the utility to shut down after seconds of idle
activity.
/cmd Command File
Opens the specified file as a source of command line
switches. This is a text file, and can have newlines for
readability.