Datcon PQRM5300 33 U I Series Instruction Manual page 51

PQRM5300 33 Ux Ix xx xx (PS)
20201120-V1
16. Select from the menu with  switch the output
polarity.
When you select the "NO (Normally open)" state then the
output transistor is in off state when there is no pulse on the
output. When you select the "NC (Normally closed" state
then the output transistor is in on state when there is no
pulse on the output.
17. Press the SEL switch.
18. Press the OK switch.
19. Press the BACK switch to exit from Modul #1 settings
submenu
51