RISCO Group Industrial LuNAR DT AM Grade 3 Guide D'installation page 21

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RC/SET INPUT
Used to determine the polarity of the external inputs.
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)
20 Ind. LuNAR RK200DTG3 Installation Guide