BLACK BOX IC521A-F Async RS-232 to 2 Wire RS485 Interface Converter. Convert async RS232 to RS485 at speeds up to 115.2 kbps with distances up to 4000 ft. over CATx cables. Product Features Operates over 2-wire half-duplex asynchronous point-to-point. Data rates up to 115.2Kbps. Up to 4000 feet range. Passes transmit and receive data only. No AC or batteries needed. Operates with or without echo. No RS-232 control signal is needed to turn around the line. Silicon Avalanche Diodes provide 600 watts per wire of protection against harmful data line transient surges. The RS-232 DB25 is fixed DCE (no switch for DTE/DCE). This is a high-speed 2-wire only point-to-point line driver. It gets power from the DTE device to run or from an add on external power supply (PS576). General specifications Approvals CE, FCC Part 15 Class A Clocking None Connectors (1) DB25 female and (1) RJ-45 female Diagnostics None Dimensions 0.7" H x 2.1" W x 2.7" D (1.8 x 5.3 x 6.9 cm) Indicators None Interface RS-232 Interface Power Draw Can be supplied by Pin 4 and Pin 20 from the DTE Line Type Twisted pair 2-wire Modem Data Rate 115.2K Number of Drops Supported 32 Operating Humidity 5 to 95% non-condensing Operating Mode Point-to-point Operating Temperature 32 to 122 F (0 to +50 C) Operation 2-wire half duplex Power Can be supplied through Pin 9, or use the PS576 Weight 2 oz. (56.7 g) Will be shipped from Europe by Air Mail International priority mail. Thanks for looking I will ship Worldwide. PayPal only.