EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 409)

SCPI Command Reference
OTDR 395
Product-Specific Commands—Description
:ERRor[1..n]?
Description This command queries the last error or event.
*RST does not affect this query.
Syntax :ERRor[1..n]?
Parameter(s) None
Response Syntax
Response(s) Error:
The response data syntax for is defined
as a
RESPONSE DATA> element.
Returns the specified error. A zero value in the
number field indicates that no error or event has
occurred.
Error structure is in A, B, C, D, E, F, G format,
where:
A = Source
B = Number
C = Description