If you are sure your network is ok and configured correctly, try resetting the RPS-ERP2 to factory defaults. Press and hold the 2 buttons on the front of the RPS-ERP-2 unit while you power on the device. Continue pressing the buttons for about 1 minute. You will hear a series of beeps. After a minute, release the buttons. Power the unit off, then back on. The RPS-ERP-2 unit will now be reset to factory default settings of IP 192.168.10.100 or 192.168.1.100. If this does not work, configure a network port on your desktop or laptop for an ip address of 192.168.10.90, netmask of 255.255.255.0 and gateway of 192.168.10.1. ( or 192.168.1.90 and gateway 192.168.1.1 alternative) Then connect a CROSS-OVER network cable (a special cable available at any computer store ) between this network port and the RPS-ERP2 unit. Power up the RPS-ERP2, which should have a default IP of 192.168.10.100 or 192.168.1.100. Open your web browser and try and access the unit directly by typing http://192.168.10.100 or http://192.168.1.100
into the browsers command line. You should see the login screen to the RPS-ERP2.