RISCO Group LuNAR DT AM Grade 3 Guia De Instalacion página 21

RC/SET INPUT
Used to determine the polarity of the external inputs.
20
12V: 12v has to be connected in order activate the function.
GND or N.C. has no influence on the RC/SET status. (see Relay
mode DIP switches configuration)
0V: The GND has to be connected in order to activate the function.
12v or N.C. has no influence on the RC/SET status. (see Relay
mode DIP switches configuration)
Ind. LuNAR RK200DTG3 Installation Guide