The maximum distance of a card reader to the access controller is 100m using CAT5E/CAT6 cable. However, with this distance, the voltage of the card reader drops due to internal resistance of the cable, so we must pair up the wire to reduce voltage drop.
Signal |
CAT5E/CAT6 Cable |
+12V |
Green/White + Green + Orange/White |
RS485+ |
Blue |
RS485- |
Blue/White |
GND |
Orange + Brown/White + Brown |
In this configuration, the voltage at the card reader is approximately 10.8V, enough to maintain stable operation.