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What is an adapter?

Update:28 Jul 2020

The adapter is an interface converter, which can be an independent hardware interface device, allowing the hardware or electronic interface to be connected to other hardware or electronic interfaces, or it can be an information interface. For example: power adapter, tripod base adapter components, USB and serial port adapters, etc.

Basic meaning:
In a computer, the adapter is usually built into a card that can be inserted into a slot on the motherboard (there are also external ones), and the adapter information in the card is exchanged with the processor and the device supported by the adapter.

The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. It is generally composed of a casing, a power transformer and a rectifier circuit. According to its output type, it can be divided into AC output type and DC output type; according to the connection method, it can be divided into wall plug And desktop. Since mobile PCs do not have batteries, power adapters are particularly important for them.

The power adapter of most mobile PCs can automatically detect 100~240V AC (50/60Hz). Basically all mobile PCs have an external power supply and connect to the host with a line, which can reduce the size and weight of the host. Only a few models have the power built in the host. There is a nameplate on the power adapter, which indicates the power, input and output voltage and current and other indicators. Pay special attention to the input voltage range. This is the so-called "travel power adapter".
When MBeans are registered to the MBean server, they need to interact with these MBeans and retrieve information for requests from management applications. This is enabled through a protocol adapter, which can convert management application data into standard protocol information.