Chapter 5 213
Storing and Retrieving Test Results
Using the To/From File Objects
In a write transaction, an “expression list” is simply a comma-separated list
of expressions that need to be evaluated to yield the data sent. The
expression may be composed of a mathematical expression, a data input
terminal name, a string constant, a VEE function, a
UserFunction, or a
global variable. In a read transaction, the expression list should consist of a
comma-separated list of output terminal names that indicate where to store
the data when it is read.
In conjunction with reading data from instruments, data formats are
described in Chapter 3, “Easy Ways to Control Instruments,” on page 127.
Most of these formats apply to all I/O transactions.
EOL (end-of-line sequence of characters) may be turned on or off, and you
can specify the EOL sequence by opening the object menu of most of the
I/O ⇒ To objects and selecting Properties..., then select Data
Format
, and make the changes under Separator Sequence.
Table 5-2. I/O Transaction Encoding
Encoding Explanations
TEXT Reads or writes all data types in a human-readable form
(ASCII) that can easily be edited or ported to other
software applications. VEE numeric data is automatically
converted to text.
BYTE Converts numeric data to binary integer and sends or
receives the least significant byte.
CASE Maps an enumerated value or an integer to a string and
reads/writes that string. For example, you could use
CASE to accept error numbers and write error messages.
BINARY Handles all data types in a machine-specific binary
format.
BINBLOCK Uses IEEE488.2 definite length block headers with all
VEE data types in binary files.
CONTAINER Uses VEE specific text format with all data types.
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