EXFO FTB-2 - Manual (Page 346)

Data Types
336 FTB-2 and FTB-2 Pro
Applicable Data Types for Output —IEEE 488.2

<SUFFIX RESPONSE DATA>
This data type is used by a device to return units and multipliers.
Examples: DBW, W, KHZ

<ARBITRARY ASCII RESPONSE DATA>
This data type is used by a device to return information when it is
impossible to use any other data type.
Example: To the *IDN? query, the device will return this response in an
arbitrary ASCII bytes format:
EXFO E.O. Engineering,,125-2A55,1.0.1.97
/
<suf f ix unit>
<suf f ix mult.> <suf f ix unit>
<digit>
-
-
<digit>
/
.
<ASCII data
by te>
<RESPONSE MESSAGE
TERMINATOR>