HXSP-2108A is our top-of-the-line converters with isolation .The RS-485 side and the RS232 side is powered by an external power supply. Specification & Features: Interface Feature: Concurrently confirm to RS-232,RS-485 standard of EIA/TI. Data Communication Speed : 300-115.2KBPS. Power Supply:12VDC/300mA. Size : 80*53*20(mm) .