Keysight Technologies N778 C Series Programming Manual page 88

5 Polarization Commands
Response: Integer value
0 = optical Scrambler Input signal will be routed to the internal polarimerer
1 = optical Scrambler Input signal will be routed to the Scrambler Output
Example: :pcon:swit? -> +0
Affects N7788C
88 Keysight N778xC Series Polarization Instruments Programming Guide