Data terminal, data transmission system, and hot swapping control method

A data transmission system, comprising:

• a data terminal and a computer, wherein
• the data terminal comprises a first processor, a first digital audio circuit, an interface isolator, a first universal serial bus USB circuit, and a first connecting apparatus, wherein the first connecting apparatus comprises a first digital audio connecting apparatus and a first USB connecting apparatus, and the first USB circuit has a hot swapping feature;
• the first processor is connected to the first digital audio circuit, the first processor is further connected to the first USB circuit, the first digital audio circuit is connected to the interface isolator, the interface isolator is connected to the first digital audio connecting apparatus, and the first USB circuit is connected to the first USB connecting apparatus;
• the computer comprises a second processor, a second digital audio circuit, a second USB circuit, a second connecting apparatus, wherein the second connecting apparatus comprises a second digital audio connecting apparatus and a second USB connecting apparatus, and the second USB circuit has a hot swapping feature;
• the second processor is connected to the second digital audio circuit, the second processor is further connected to the second USB circuit, the second digital audio circuit is connected to the second digital audio connecting apparatus, and the second USB circuit is connected to the second USB connecting apparatus;
• the first connecting apparatus is configured to connect to the second connecting apparatus, so that the data terminal is connected to the computer, wherein the first digital audio connecting apparatus is configured to connect to the second digital audio connecting apparatus, and the first USB connecting apparatus is configured to connect to the second USB connecting apparatus;
• after the data terminal is connected to the second connecting apparatus of the computer by using the first connecting apparatus, an initial status of the interface isolator is a disconnected state, and the first USB circuit and the second USB circuit enter an initialization process;
• after initialization of the first USB circuit and the second USB circuit is complete, the first processor negotiates with the second processor by using the first USB circuit, the first USB connecting apparatus, the second USB connecting apparatus, and the second USB circuit, and determines a first configuration parameter of the first digital audio circuit and a second configuration parameter of the second digital audio circuit;
• the first processor configures the first digital audio circuit according to the first configuration parameter, and the second processor configures the second digital audio circuit according to the second configuration parameter;
• and
• after configuration on the first digital audio circuit and the second digital audio circuit is complete, the interface isolator receives a connection command, and switches from the disconnected state to a connected state according to the connection command, so that a channel among the first digital audio circuit, the first digital audio connecting apparatus, the second digital audio connecting apparatus, and the second digital audio circuit is connected, and voice data transmission is performed between the first processor and the second processor by using the first digital audio circuit, the first digital audio connecting apparatus, the second digital audio connecting apparatus, and the second digital audio circuit.

A hot swapping control method, wherein the hot swapping control method is applied to a data terminal, and the data terminal comprises a first interface, wherein the first interface comprises a first digital audio interface and a first USB interface, and the first USB interface has a hot swapping feature;

• and
• the hot swapping control method comprises:
• after the data terminal is connected to a computer by using the first interface, initializing the first USB interface, wherein an initial status of a channel between the first digital audio interface and the computer is a disconnected state;
• after initialization of the first USB interface is complete, negotiating, by the data terminal, with the computer by using the first USB interface, and determining a first configuration parameter of the first digital audio interface;
• configuring, by the data terminal, the first digital audio interface according to the first configuration parameter;
• and
• connecting the channel between the first digital audio interface and the computer, so that voice data transmission is performed between the data terminal and the computer by using the first digital audio interface.