Abstract: A switching device includes a plurality of first interfaces respectively coupled to a plurality of computers, a third interface coupled to a display module, and a switching unit coupled to the first interfaces and the third interface. The switching unit is used for selecting one of the first interfaces to be coupled to the third interface in response to a command. The display module receives a video signal from a selected one of the computers through the selected first interface and the third interface, and displays video information.

Abstract: A test circuit for testing a flexible printed board (FPC) is provided, the test circuit includes a parameter preset module, a comparison module, and a prompt module. The parameter preset module is used to preset a parameter range indicating the suitable range of the resistance value of the FPC, and is further configured to connect to the FPC and convert the resistance value of the FPC to a related parameter. The comparison module compares the related parameter with the parameter range preset by the parameter preset module, and produces a comparison result. The prompt module produces a corresponding prompt signal according to the comparison result.

Abstract: A screw counter includes a first interface, a second interface, and a processing unit. The first interface connected to a screwdriver, the screwdriver is adapted for screwing a predetermined total number of screws into a workpiece to perform a screwing operation on the workpiece. The second interface is connected to a detecting unit. The detecting unit detects a start time and a finish time of the screwing operation. The processing unit counts a variable, each time when the processing unit is changed from a first state to a second state, the variable adds one; a total added value of the variable is calculated during a time interval between the start time and the finish time to acquire a total number of screws which are completely screwed into the workpiece.

Abstract: A test circuit for testing a flexible printed board (FPC) is provided, the test circuit includes a parameter preset module, a comparison module, and a prompt module. The parameter preset module is used to preset a parameter range indicating the suitable range of the resistance value of the FPC, and is further configured to connect to the FPC and convert the resistance value of the FPC to a related parameter. The comparison module compares the related parameter with the parameter range preset by the parameter preset module, and produces a comparison result. The prompt module produces a corresponding prompt signal according to the comparison result.

Abstract: A switching device includes a plurality of first interfaces respectively coupled to a plurality of computers, a third interface coupled to a display module, and a switching unit coupled to the first interfaces and the third interface. The switching unit is used for selecting one of the first interfaces to be coupled to the third interface in response to a command. The display module receives a video signal from a selected one of the computers through the selected first interface and the third interface, and displays video information.