The Prolific PL2303GR is a USB-to-RS485 bridge controller designed for industrial and serial communication applications. It is fully compliant with USB 2.0 full-speed specifications and integrates a USB 1.1 transceiver, 5V-to-3.3V regulator, and 96 MHz clock generator. Its built-in RS485 transceiver follows EIA/TIA-485 standards, supporting UART interface pins (A, B), software flow control, and baud rates up to 10 Mbps. The chip includes programmable OTPROM for USB descriptors, unique serial IDs, 1024-byte bidirectional buffers, and comes in an SSOP-28 package for compact hardware designs.