19-18 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Section 19: Remote Commands Series 2600A System SourceMeter® Instruments Reference Manual
File I/O
Lua supports file I/O with its io library commands. A subset of these commands is supported for
use with Series 2600A instruments. As with Lua fs, these commands are encapsulated as an io
logical instrument so that the files on any given node are accessible to the entire TSP-Link system.
Lua organizes its file I/O commands into two groups:
1. Commands that reside in the io table, for example: io.open, io.close, io.input,
and io.output. These commands are responsible for opening and closing file descriptors
and performing basic I/O operations on a pair of default files, one input and one output.
2. Commands that reside in the file descriptors themselves (for example: file:seek,
file:write, and file:read) operate exclusively on the file with which they are
associated.
NOTE File descriptor commands for file I/O use a colon (:) to separate the
command parts rather than a period (.) like the io commands.
Note that file descriptors cannot be passed between nodes in a TSP-Link system; as such, the
io.open command is not accessible via the TSP-Link. However, the default input and output files
mentioned above allow for the execution of many file I/O operations without any reference to a file
descriptor.
The following Lua I/O commands, which support basic file I/O, are included for your reference:
file:close
file:flush
file:read
file:seek
file:write
io.close
io.flush
io.input
io.open
io.output
io.read
io.write
io.type
The following standard I/O commands are not supported at this time:
file:lines
file:setvbuf
io.lines
io.popen
io.tmpfile
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