1、Function: This USB to 4 Port RS232 serial distributor supports to convert 1xUSB port to 4xRS232 serial ports. The input port is 1xUSB (USB2.0, USB1.1) and the output port is 4xRS232 (DB9 Serial). 2、Applicable: USB 2.0 to serial adapter is used where there are not enough serial ports. Easier to communicate with other devices. Provides fast access to computers without serial ports (4 RS232 ports can work at the same time). 3、Bidirectional Transmission: USB 2.0 to serial adapter supports bidirectional transmission with no delay in transmission. Direction control, using the data flow automatic control technology, regulate automatic control and data transmission, no need to manually switch the transmission direction. 4、Widely Compatible: Compatible with for Windows 10, for Windows 8, for Windows 7, XP, for Windows 2000, for OS X v5.6...... and other operating systems. 5、Aluminum Alloy Shell: USB to 4 Port RS232 serial adapter adopts premium aluminum alloy shell, durable, excellent heat dissipation performance, long service life. Item Type: USB to 4 Port RS232 Serial Adapter Material: Aluminium Alloy Size: Approx. 179x79x22mm / 7.05x3.11x0.87in Input Port: 1xUSB (USB2.0, USB1.1)Output Port: 4xRS232 (DB9 Serial)USB Signals: VCC, DATA+, DATA-, GND, FGRS232 Signal: DCD, RXD, TXD, DTR, GND, for DSR, RTS, CTS, RT Operating System: for Windows 10, for Windows 8, for Windows 7, XP, for Windows 2000, for OS X V5.6...... Operating Mode: Asynchronous, Point to Point Data Telecommunication Rate: 300~512kbs Baud Rate: 5400bps~921600bps Transmission Distance: USB Port: <5m, RS232 Port: <15m Direction Control: Utilizing Data Flow Automatic Control Technology to Regulate Automatic Control and Data Transmission 1 x Host 1 x USB Cable 1 x Instruction Manual 1 x Power Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store