EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 376)

SCPI Command Reference
362 OTDR
Product-Specific Commands—Description
:CALCulate[1..n]:TORL?
Description This query returns the sum of all optical return
loss (ORL) values measured on the total fiber
length, for the trace corresponding to the
specified trace index. This total ORL value does
not include the launch reflection. A negative
total value indicates that the real value is smaller.
*RST clears this value.
Syntax :CALCulate[1..n]:TORL?<wsp>TRC1|TRC2|TRC
3|TRC4
Parameter(s) Label:
The program data syntax for the first parameter is
defined as a <CHARACTER PROGRAM DATA>
element. The allowed <CHARACTER PROGRAM
DATA> elements for this parameter are:
TRC1|TRC2|TRC3|TRC4.
Trace index of the available wavelengths.
Response Syntax <TotalOrl>