EXFO FTB-500 Guía Del Usario página 382

Data Types
Applicable Data Types for Output —IEEE 488.2
<SUFFIX RESPONSE DATA>

This data type is used by a device to return units and multipliers.
/
<suf f ix mult.>
<suf f ix unit>
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
374
/
.
<suf f ix unit>
-
<ASCII data
by te >
-
<digit>
<digit>
<RESPONSE MESSAGE
TERMINATOR>
FTB-500