Siemens PLCS7-200, programming line PPI can be used with USB interface

PPI programming cable, also known as the programming adapter, useful computer COM port, but also useful computer usb port.
What connect is to say, the usb port that converts computer is COM port, have this to turn a wire, mount drive to go, basically be aimed at notebook computer a lot of did not yo COM port is used. The two ends of the adapter are USB port and COM port respectively. And then using this line COM port, the adapter that connects to PPI’s COM port, program 200.
U port adapter, without anything, its own end is a USB port, directly connected to the computer on the line. The other end is the COM port, 9 true D head, connected to PLC.
Programming software is to choose COM port or USB port.