The 28A11A0 is a USB to RS232 / RS485 / RS422 Converter with a USB B input and RS232 DB9 Male Connector or RS485/RS422 screw terminal output. It has a communication speed of 300bps to 230Kbps and auto direction control for RS485-2W data transmission. The 28A11A0 has galvanic isolation of 1.5kV and RS232/RS485 line protection +/- 15lV ESD. This unit is also self powered from the USB so no need for external supply voltage.