... , high performance and reliability. 3.Miaxis SM-621 optical sensor, scratch-resistant, durable, blue background light. 4.Support professional access control, ... RS485, TCP/IP(optional), USB(optional)Standard access control interfaceWEIGAND34,dry contact standard access output controlOpen door delay 1~255sLCD 128× ... /IP port. MX602 refers to USB port. MX461 Fingerprint access control and time attendance