Door Strike relays from separate controllers can be used to control a single door. This is not recommended but in some rare cases it makes sense e.g. using a V2000 two door HID VertX controller to control a single door with and IN and OUT reader for time and attendance. The following diagram is self explanatory…
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CredoID eDocumentation
CredoID Version 4.x is the latest open systems Access Control Platform that integrates to any environment via a free API Interface. The best selling single door controller is without question the HID Mercury LP1501 PoE+ Controller.
Without question, the highest quality readers in the industry are the HID Signo Readers.