The ISC-1210U-I / ISC-1310U-I converter is an intelligent, stackable expansion module that connects to a PC USB port or USB Hub via the Universal Serial Bus(USB) port, providing one High-Speed RS-232/RS-422 or RS-485 serial port(jumper-less). The ISC-1210U-I / ISC-1310U-I features easy connectivity for traditional serial devices. The RS-232 standard supports full-duplex communication and handshaking signals (such as RTS, CTS) and the RS-485 control is completely transparent to the user and software written for half-duplex operation without any modification. The ISC-1210U-I / ISC-1310U-I's opto-isolators provide 3000 VDC of isolation to protect the host computer from destructive voltage spikes on the RS-232/RS-422 and RS-485 data lines. ISC-1210U-I / ISC-1310U-I also offer internal surge-protection on data lines. The internal high-speed transient suppressors on each data line protect the modules from dangerous voltages levels or spikes. In addition, the ISC-1210U-I / ISC-1310U-I module derives the power from USB port and doesn’t need any aid of external power adapter.