ModiCon can connect Android Devices to Modbus-tcp Equipment as client. Modbus-tcp Equipment like Plc connect to modem-router directly and then app ready to network connection , if router connect to internet app can connect over internet . app have 4368 Programmable tags in 3 Layer (Input,Coil, Register and menu) Layer 1 have 16 tags each contain 16 tag in Layer 2 each contain 16 tags in layer 3.the user can design the human machine interface on Android phone.