If the reader ‘s standard port has dry contact signal, it can open the lock directly, but if it has wiegand signal, it must connect access controller. 1, connect to lock directly, and any type cable can be used to connect.     2, Connect through a power supply, which is much safer. For NO lock, there are no power from these two pin normal, so the NO emlock will be closed normal, and if passed the finger or card, the relay will release, then these two pins will output 12V power, the NO emlock will be unlocked. For NC lock, there are 12V power from these two pin, so the NC emlock will be closed normal, and if passed the finger or card, the relay will release, then these two pins will be without 12V power, the NC emlock will be opened.   3, you can also use a special e-clock power supply.