Fangrui Product Details This Is A High-speed Usb Bus Adapter Module That Realizes The Function Of Usb To 8 Ttl Serial Ports. It Is Used To Expand The Asynchronous Serial Port For The Computer, Or Directly Upgrade Serial Port Device Or Mcu To The Usb Bus. Built-in Firmware, Emulates The Standard Serial Port, Used To Upgrade The Serial Port Peripherals, Or Add Additional Serial Ports Through Usb. The Serial Port Application Under The On The Computer Is Fully Compatible Without Modification. Supports , Linux, Android, Macos And Other Operating Systems. Hardware Full-duplex Serial Port, Built-in Transmit And Receive Buffer, Communication Baud Rate Supports 1200bps-6mbps. The Serial Port Supports 8 Data Bits, Odd Parity, Even Parity And No Parity, And Supports 1 Or 2 Stop Bits. Each Serial Port Has A Built-in 2048-byte Receive Fif0 And A 1024-byte Transmit . Supports Half-duplex, Provides 4 Tnows To Indicate The Serial Port Is Sending Status, Which Can Be Used To Control Rs485 Transceiver Switch. Supports Rs232, Rs485, Rs422 And Ot