The USB is supported by all of the computers in these days that’s why the developers like to use this communication protocol by connecting devices to PC. It has many advantage like the big data transmission speed or it could be used as a power supply for the device buti t has also limits like the length of the cable can’t be more than 5 meter.
Most of the devices in the indutry have serial port but less and less computer has this interface that’s why a new device is needed which converts the serial port communication to USB. There are some special ICs for this problem, like FTDI, but most of the semiconductors contain the USB interface so the problem can be solved by sortware without ading any new part to our circuit.
Under my thesis I present the development of a USB-RS422 converter device which connects to a far data acquisition device and transmits the incoming datas with high bandwidth to the computer.