EXFO FTB-2 - Manual (Page 328)

Data Types
318 FTB-2 and FTB-2 Pro
Applicable Data Types for Input—IEEE 488.2
Applicable Data Types for Input—IEEE 488.2

<PROGRAM MESSAGE TERMINATOR>
In the diagram above,

“NL” corresponds to ASCII character code 10, in decimal (0A in
binary)

“END^” corresponds to the last data byte of the message sent with
EOI = True and ATN = False
<wsp> NL END^
NL
END^