About change from UAM (PNP) to NPN output

Relation

• What happens to the slave side when an area switching signal is input to the slave side while using the master-slave function of UAM-05LP-T301?

• I get an optical window / short-distance error when using the muting function. Is it normal that short-distance error occurs if there is an object near the sensor even in muting mode?
  The cause is probably smoke. Smoke will be a trigger of the short-distance error.

• What is OOSD output?

• Are there any precautions to take when attaching a cover?

• What kind of output is synchronous output?