IDS-5642-I+ is an innovative 4 port isolated RS422/485 to 2 ports LAN redundant security device server. To assure the agility and security of critical data, IDS-5642-I+ offers many powerful features for HW & SW redundant functions. When the connection between master-link and LAN fails, IDS-5642-I+ can automatically switch to another LAN port within 10mS, and still guarantees a non-stop connection. IDS-5642-I+ also supports switch mode, users can use Daisy Chain to reduce the usage of Ethernet switch ports. Secondly, IDS-5642-I+ can simultaneously transfer SSL encryption data into 5 host PCs. This feature can assure all critical data that saved in different host PC to avoid Ethernet break or host PCs failure. Thirdly, IDS-5642-I+ provides dual redundant power inputs on DC power jack and terminal block. IDS-5642-I+ also provides NAT pass through function so that users are able to manage IDS-5642-I+ inside or outside the NAT router. It is easy for different IP domain users to use IDS-5642-I+. In addition, IDS-5642+ also support P.O.E. PD on ETH2. This feature is fully compliant with IEEE802.3af standard. Therefore, IDS-5642-I+ is one of the best security communication redundant solutions for application of serial devices.