EXFO FTB-2 - Manual (Page 258)

Using Your Unit and Modules in an Automated Test Environment
248 FTB-2 and FTB-2 Pro
Error Message Format
Error Message Format
System and device-specific errors are managed by your unit. The generic
format for error messages is illustrated in the following figure.
As shown in the above figure, the message contains three parts:

error number

error description

device-dependent information
Error messages ending in a negative number are SCPI-based errors.
For a complete list of possible errors, see the appendix on SCPI-based
errors.
<Error
number>
, "
<Error
description>
; " <Device
dependent
information>