Getting this to work was more than a bit Tricky for me. Hopefully my settings will help. In the Manual (PDF) linked in the references it shows what the best place to plug it in for your MCU. I have the Octopus Pro V1.01

Add this to your Printer.cfg in your user overrides section

[filament_switch_sensor RUNOUT] 
switch_pin: ^PG12
pause_on_runout: True
event_delay: 3.0
pause_delay: 0.5
runout_gcode:
  M117 Filament not detected, pausing...
  M106 S0
  M104 S150
  PAUSE # [pause_resume] is required in printer.cfg
  SET_IDLE_TIMEOUT TIMEOUT=86400
insert_gcode:
  M117 Filament detected, check hotend temp and resume
  

[filament_motion_sensor JAM]
switch_pin: ^PG13
detection_length: 8 # accuracy of motion sensor 2.88mm 
extruder: extruder
pause_on_runout: True
event_delay: 3.0
pause_delay: 0.5
runout_gcode:
  Turn off part cooling fan and set hotend heater to idle temp @ 150C
  M117 Filament jam detected, pausing...
  M106 S0
  M104 S150
  PAUSE # [pause_resume] is required in printer.cfg
  SET_IDLE_TIMEOUT TIMEOUT=86400
insert_gcode:
  M117 Jam cleared, Filament detected, check hotend temp and resume

[delayed_gcode DISABLEFILAMENTSENSOR] ; This will disable the SFS 1 second after klipper starts
initial_duration: 1
gcode:
  SET_FILAMENT_SENSOR SENSOR=RUNOUT ENABLE=0 ; Put your filament sensor's name after SENSOR=
  SET_FILAMENT_SENSOR SENSOR=JAM ENABLE=0 ; Put your filament sensor's name after SENSOR=

[gcode_macro _USER_START_PRINT_AFTER_HEATING_EXTRUDER]
gcode:
    M117 ENABLING the Smart Filament Sensor
    SET_FILAMENT_SENSOR SENSOR=JAM ENABLE=1
    SET_FILAMENT_SENSOR SENSOR=RUNOUT ENABLE=1

[gcode_macro _USER_END_PRINT_AFTER_HEATERS_OFF]
gcode:
  M117 DISABLING the Smart Filament Sensor
  SET_FILAMENT_SENSOR SENSOR=JAM ENABLE=0
  SET_FILAMENT_SENSOR SENSOR=RUNOUT ENABLE=0

Installed it will appear:

If a Jam or Runout is detected:

• It will pause the machine
• It will turn off the fan and put the hot end to idle at 150C
• It will keep the bed temp the same.

My print below jammed (from the end of the filament being kinked to the spool) at 99% and at 11:56pm it paused the machine. I came in the bed was hot and the printer could continue the print desired.

Optionally I’ve expanded it to have a dialog box pop up to load and unload filament as well as resume the print at the temp it was. This depends on having an up to date Mainsail and Klipper and using the Ratrig standard macros.