The factory default IP address of the Digi One IA is 0.0.0.0, and by default the serial port of the Digi One IA does not generate a login prompt. You must put the device on the LAN, a hub, or an ethernet crossover to the NIC of your PC and use the Setup Wizard, Device Discovery utility, DHCP, or Ping-ARP to assign it an IP. There is additional information about how to configure the Digi One IA in the user manual here: http://ftp1.digi.com/support/documentation/92000326_D.pdf starting on page 11.