In the instructions provided in the product file on our website for ref. 5190, we find with the following diagram.
If the external controller is AC-MAX 5223 / 5224 or with the MINI WIFI CONTROLLER ref. 5193, we must make a bridge between the negative and the R so that the red LED remains lit whenever the keypad is powered.
970174Ic Wiegand Keypad Reader V04_25