The USB485 is a USB to RS-485 converter card that facilitates communication between a PC and R256 or R356 controllers via a standard USB port. It supports UART interface modes with configurations for 7 or 8 data bits, 1 or 2 stop bits, and various parity options including odd, even, mark, space, or none. The device offers data transfer rates from 300 to 250,000 baud, with a receive buffer capacity of 384 bytes and a transmit buffer of 128 bytes. It features an integrated 6 to 48 MHz clock multiplier PLL, ensuring compatibility with USB 1.1 and USB 2.0 standards, and supports operating systems such as Windows 98/98SE/ME/2000/XP/7. Additional features include high data throughput buffering, automatic transmit buffer control, and an integrated power-on-reset circuit. The converter card is suitable for use in communications and networking applications.