Serial interface refers to the sequential transmission of data bit by bit. Its characteristic is that the communication line is simple, and two-way communication can be realized only by a pair of transmission lines (telephone lines can be directly used as transmission lines), which greatly reduces the cost and is especially suitable for long-distance communication, but the transmission speed is slow.
Application introduction:
A router can be connected to a serial port or an Ethernet port on the router.
The serial number value is very important in the DNS server, and it should be changed to a larger value every time the domain name server changes, so as to synchronize with the global DNS server data smoothly.
Serial number. For example, if a java class does not generate a serialized id for a class, it will generate a warning. At this point, you can add the following code:
@SuppressWarnings("serial ").
Universal serial bus =usb? Universal serial interface.