Door access control system, which is also named as door control system, entrance control system, keyless entry system, keypad and card access control system, card access control system, electric access control. Normally, the door access control system includes access control mother board, proximity reader(125KHz or 13.56MHz card), 12VDC electric lock(triggered to unlock by legal signal sent from mother board if the card is legally authorized), 12VDC（linear or switching）power supply, 12V7AH rechargeable industrial battery, RS232 to RS485 communication converter(for RS485 type), cable, proximity cards(sometime customers prefer to use fob, keychain etc), and software.