The Four-Door Network Access Controller from Hikvision is designed to control and grant access to four card reader door interfaces. RS-485 and Wiegand card reader interfaces enable this device to read up to 100,000 cards and capture up to 300,000 events. Card reading is expandable to up to 300,000 cards, and event capturing is expandable to 600,000 events. Communication data on this network access controller is encrypted for system security. A fire relay connects with a third-party fire alarm system and cuts off power to release doors without software linkage. The controller integrates with an NVR/DVR to send alarm notifications and trigger event recording and playback on a local monitor. A tamperproof switch provides an additional layer of security.