Panasonic PV500 User Manual page 220

Direction
Detected angles vary depending on the specified direction and the setting value of "Angle Range".
Example) For Distance Point - Point
Direction Appearance of Direction
ST -> ED
ED -> ST
Down
Left
Up
Right
218
Angle Range and Detect Angle
Angle Range: 0<->360
Range: 0 - 359.999
Result: 160
Range: 0 - 359.999
Result: 340
Range: 0 - 179.999
Result: 160
Range: 90 - 269.999
Result: 160
Range: 180 - 359.999
Result: 340
Range: 0 - 89.999, 270 - 359.999
Result: 340
Angle Range: -180<->180
Range: -179.999 - 180
Result: 160
Range: -179.999 - 180
Result: -20
Range: 0 - 179.999
Result: 160
Range: 90 - 180,
-90.001 - -179.999
Result: 160
Range: 0 - -179.999
Result: -20
Range: 0 - 89.999 and
-0.001 - -90
Result: -20