Ruida LMT Switch PNP Support

Hi, 

I have the Rudia RDC6563FG-Lite and have some questions about the controller, It says it supports 5v and 24v output limit switches and there is a Limit polarity setting for positive and negative on software but changing this setting cause no change and limit is only triggered by GND connection. 

Am I doing something wrong or is PNP not supported? My switch is PNP NC Proximity swtich

 

Manual Picture