1.Communicational: TCP/IP or RS232 and RS485 . 2.Optional: ID/HID/Mifare card, Web server, USB host, Short message, Work code. Technical Specifications :· Hardware platform: ZEM500 · Operating system: Linux· User capacity : 1500 · Transaction capacity: 50000 · Sensor: ZK Sensor· Algorithm version : 2007 Version ZK new algorithm · Access Control : 50 Time Zone ,5 Grouping, 10 Combination, Holiday ...