1.USB controller is a switch to control USB. By default, it is enabled. If turned off, all USB devices cannot be used. The traditional support of USB device is to load the driver of USB device when the device is started. Generally speaking, it refers to the mouse and keyboard. By default, it is in the open installation state. If the status is OFF, the mouse and keyboard will not be available when the device is started.

2. The switch of USB controller is larger than that supported by the old USB device. If the usbsb controller is turned off, the settings supported by the old USB device will not take effect.

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Fully distributed: In FCS, each field device has enough autonomy, and they communicate with each other, so that all kinds of control functions can be completely dispersed to each device without a central control computer to realize real distributed control.

Bidirectional transmission: traditional 4~20mA current signal, one line can only transmit one signal. Fieldbus devices can transmit sensor signals upwards and control information downwards on one line.

Intelligence and autonomy: Fieldbus equipment can handle all kinds of parameters, running status information and fault information, and has high intelligence, and can work independently in the case of component or even network failure, which greatly improves the reliability and fault tolerance of the whole control system.

SM bus controller is the abbreviation of System Management, which was proposed by Intel in 1995 and applied to low-rate communication in mobile PC and desktop PC systems. It is a motherboard chip technology, which is mainly used to standardize the data exchange between the main chips of the motherboard, control the devices on the motherboard, and collect the corresponding information.

References:

Baidu encyclopedia-/