EXFO IQS-600 Integrated Qualification System - Manual (Page 318)

IEEE 488.2 and Specific Commands
310 IQS-600
Specific Commands
When the data is returned in ASCII, the
<Length> is the number of significant digits to
be returned. A <Length> value of zero indicates
that the device selects the number of significant
digits to be returned.
When the data is returned in PACKED <Type>,
the <Length> is not used and always returns 0.
Example(s) FORM? Return ASCII,6
FORM? Return PACKED,0
See Also FORMat[:DATA]?
:FORMat[:DATA]?