CH384 is a four-port serial port and printing port chip for the PCI-Express bus. It includes four asynchronous serial ports compatible with 16C550 or 16C750 and an EPP/ECP enhanced bidirectional parallel port. It can also be expanded by adding a CH438 chip to up to 24 serial ports. The asynchronous serial port provides an 256- buffer for sending and receiving, supports IrDA infrared codec, supports 8Mbps communication baud rate, and can be used for RS232 serial port expansion of the PCI-E bus, PCIE high-speed serial port with automatic hardware rate control, and serial port Networking, RS485 communication, IrDA communication, parallel port/printing port expansion, etc. The same chip can be configured as a four-channel serial port + parallel port/printing port or a four-channel serial port + extended multi-serial port of the PCI-E bus. Provides a two-wire serial host interface, which can be connected to a serial EEPROM device similar to 24C0X for storing non-volatile data. The device identification ( ID, Device ID, Class Code, etc.) of the PCIE board can be set in the EEPROM device. 3.3V power supply voltage, main I/O pins support 5V withstand voltage, and support serial port low-power sleep mode. Serial port: 4 completely asynchronous serial ports, compatible with 16C550,16C552,16C554 and 16C750 and enhanced Supports 5, 6, 7 or 8 data bits and 1 or 2 stop bits Supports odd, even, no check, blank 0, flag 1 and other check modes Programmable communication baud rate, supports communication baud rate of 115200bps and up to 8Mbps Built-in 256- first-in-first-out buffer, supporting 4 trigger levels Supports MODEM modem signals ,,RI,DCD,DTR,,and can be converted to RS232 level Supports hardware flow control signals and automatic handshake and automatic transmission rate control, compatible with TL16C550C Supports serial port frame error detection and Break line interval detection Supports full-duplex and half-duplex serial communication Serial port 0 has a built-in SIR infrared codec and supports IrDA infrared communication with a baud rate of 2400bps to 115200bps Supports external CH438 chip to expand another 8 to 24 asynchronous serial ports,realizing PCIE eight serial ports and PCIE twenty-eight serial ports. :For 98SE/ME/NT 4.0/2000/XP/Vista/Server2003/Win 7,for Linux Note:Different Batches May Have Differences In Product Appearance, Color,And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB Package Contents: 1 * PCI-E CH384L Multi-Serial Card 1 * CD-Driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.