EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 325)

OTDR 311
C SCPI Command Reference
This appendix presents detailed information on the commands and
queries supplied with your Optical Time Domain Reflectometer.
I
MPORTANT
Since the FTB-500 can house many instruments, you must explicitly
specify which instrument you want to remotely control.
You must add the following mnemonic at the beginning of any
command or query that you send to an instrument:
LINStrument:
where <LogicalInstrumentPos> corresponds to the identification
number of the instrument.
For information on modifying unit identification, refer to your
platform user guide.
FTB-500 backplane identification number
Instrument slot number:
1Y