EXFO FLS-2200 Broadband Source - Manual (Page 108)

Data Types
100 FLS-2200
Applicable Data Types for Output—IEEE 488.2

(or )
This data type will be used by a device to return positive or negative
integers.
Examples: 4, –23, 90

(or )
This data type will be used by a device to return positive or negative
real numbers (fixed-point numbers).
Examples: 23.45, 1.22, –4.55
+
-
.
+
-