2X(USB 2.0 to RS485 RS422 Serial Converter Adapter Cable for - Chip 103981
Serial Protocol: RS485 / RS422. Specification: USB 2.0; EIA/ RS485 and RS422 standard. 4 Kinds of Working Modes: Asynchronous. 2X(Specific The USB end must be connected to PC or. 1 x USB to Serial Converter Cord. ).