FEATURE – Extend RS-232/485/422 transmission up to 120Km with single-mode – Transmit asynchronously, point to point, speed reach 500Kbps – Examine signal speed automatically, zero delay time – Plug-and-Play(hot-pluggable, data format auto-sensing & self-adjusting) – Support RS-232/485/422 interface type, but only one RS-232/ RS-485/ RS-422 port can be connected at a given time – 5VDC power supply input