EXFO FTB-2 - Manual (Page 347)

Data Types
FTB-2 and FTB-2 Pro 337
Applicable Data Types for Input—SCPI
Applicable Data Types for Input—SCPI
SCPI data types include the IEEE 488.2 data types (see Applicable Data
Types for Input—IEEE 488.2 on page 318) with certain additional
restrictions.

: abbreviated form of the decimal numeric element.
It differs from the “”
described in IEEE 488.2.
Several forms of are defined as
special forms of numbers. These are: MINimum, MAXimum, DEFault,
UP, DOWN, Not A Number (NAN), INFinity and Negative INFinity
(NINF). The following special forms are likely to be used by EXFO’s
instruments in certain commands or queries:

DEFault: This special parameter forces the
instrument to select a value, which is deemed to be convenient to
the user.

MINimum|MAXimum: These special
parameters refer to the instrument’s limit values. MINimum
corresponds to the value closest to negative infinity that the
function can accept. MAXimum corresponds to the largest value
that the function can accept.

: This form is often used as a shorthand
of the ON|OFF form.
parameters have a value of 0 or 1 and
are not followed by any unit.
On input, an is rounded to an integer.
A non-zero result is interpreted as 1.
ON and OFF are accepted on input for readability purposes. They
correspond respectively to 1 and 0. However, on output, they
appear as 1 or 0, never ON or OFF.