(H-301 single port RS-232/RS-485/RS-422 serial port networking server provides RS-232/RS-485/RS-422 three serial port methods and 1 channel 10Base-T supports TCP, UDP, APR, ICMP and DHCP The protocol supports Socket-based user program access, all settings in Server and Client modes can be terminated through the network or serial port, support through gateway, cross-route communication Support Windows Native COM and network interruption automatic recovery connection)