CN104503595A - PS/2 keyboard-mouse switching device - Google Patents

Abstract

A PS/2 keyboard and mouse switching device, which relates to the field of computers, and solves the problems of wasting resources, high cost, and limited space in which each computer needs to be equipped with a set of keyboards and mice in the existing occasions involving multiple computers or servers. question. The device consists of an external PS/2 keyboard input interface, an external PS/2 mouse input interface, a PS/2 keyboard signal receiving and processing unit, a PS/2 mouse signal receiving and processing unit, a switching control switch, an output channel indicating unit, two Composed of 5V power semiconductor switch and multiple RS232 signal output interfaces. The present invention can convert PS/2 signals of external keyboard and external mouse into RS232 signals, prolong the transmission distance to a certain extent, cooperate with multiple "PS/2 keyboard and mouse simulators" near the computer, and realize multiple computers Share a set of external PS/2 keyboard and external PS/2 mouse, disconnecting the external PS/2 keyboard and mouse at any time and place will not affect the computer work, improves resource utilization, low cost, and easy to implement.

Description

A PS/2 keyboard and mouse switching device

technical field

The invention relates to the technical field of computers, in particular to a PS/2 keyboard and mouse switching device.

Background technique

As one of the communication interfaces on personal computers, the RS232 interface is an asynchronous transmission standard interface formulated by the Electronics Industry Association. It has the characteristics of less transmission lines and easy wiring. At present, through the improvement of RS232 interface and communication technology, the communication distance of RS232 has been greatly increased.

With the gradual development of the computer application field and the continuous increase of network applications, the number of computers and servers in many applications is also increasing, and the management of computers involves the operation of each computer, especially for the management of the BIOS level. If each computer is equipped with a set of keyboards and mice, it will not only waste resources and increase costs, but also be difficult to implement in applications with limited space.

Contents of the invention

In order to solve the existing problems involving multiple computers or servers, each computer needs to be equipped with a set of keyboards, mouse waste of resources, high cost, and limited space, the present invention provides an external PS/2 keyboard Signal and external PS/2 mouse signal are respectively converted to RS232 keyboard signal and RS232 mouse signal output, and can be used with multiple "PS/2 keyboard and mouse simulators" near the computer to realize multiple computers sharing a set of external PS/2 PS/2 keyboard mouse switcher for 2 keyboards and external PS/2 mouse.

The technical scheme that the present invention adopts for solving technical problems is as follows:

A kind of PS/2 keyboard and mouse switching device of the present invention comprises:

The PS/2 keyboard signal receiving and processing unit composed of the first main control chip and the RS232 keyboard signal output channel gating chip, the external PS/2 keyboard input interface connected with the first main control chip, and the first main control chip respectively A 5V power semiconductor switch connected to the external PS/2 keyboard input interface, a PS/2 mouse signal receiving and processing unit composed of the second main control chip and the RS232 mouse signal output channel gating chip, connected to the second main control chip The external PS/2 mouse input interface, another 5V power semiconductor switch connected to the second main control chip and the external PS/2 mouse input interface, and the switch control switch connected to the first main control chip and the second main control chip respectively A switch, an output channel indicating unit connected to the switching control switch, a plurality of RS232 signal output interfaces; each RS232 signal output interface is connected with the RS232 keyboard signal output channel gating chip and the RS232 mouse signal output channel gating chip;

The external PS/2 keyboard is connected to the system through the external PS/2 keyboard input interface. After the first main control chip is initialized, it delays 590ms to supply power to the external PS/2 keyboard by controlling the 5V power semiconductor switch, and the analog computer releases the external PS/2 keyboard. The clock line and data line of the keyboard, read the self-test uploaded by the external PS/2 keyboard and pass the instruction and device ID, complete the initialization setting of the external PS/2 keyboard and send the corresponding command to enable the external PS/2 keyboard to make it enter the normal state After triggering the external PS/2 keyboard, the first main control chip reads the PS/2 keyboard signal uploaded by the external PS/2 keyboard and stores it. The keyboard signal output channel strobe chip strobes the corresponding RS232 signal output interface and at the same time indicates the strobe status through the output channel indicator unit. The first main control chip judges the received PS/2 keyboard signal. If it is judged to be a valid PS The /2 keyboard signal is encoded, and after adding the communication check byte and data statistics byte, it is converted into an RS232 keyboard signal and sent to the RS232 signal output interface. If it is judged to be an invalid PS/2 keyboard signal, it will be controlled by the 5V power supply. The semiconductor switch powers on the external PS/2 keyboard again, and repeats the above process until a valid PS/2 keyboard signal is output;

The external PS/2 mouse is connected to the system through the external PS/2 mouse input interface, and the second main control chip delays 590ms after initialization to supply power to the external PS/2 mouse by controlling the 5V power semiconductor switch, and the analog computer releases the external PS/2 mouse. The clock line and data line of the mouse, read the self-test uploaded by the external PS/2 mouse, pass the command and device ID, complete the initialization setting of the external PS/2 mouse and send the corresponding command to enable the external PS/2 mouse to make it enter the normal state After triggering the external PS/2 mouse, the second main control chip reads the PS/2 mouse signal uploaded by the external PS/2 mouse and stores it. The mouse signal output channel strobe chip strobes the corresponding RS232 signal output interface and at the same time indicates the strobe status through the output channel indicator unit. The second main control chip judges the received PS/2 mouse signal. If it is judged to be a valid PS /2 mouse signal is coded, after adding communication check byte and data statistics byte, it is converted into RS232 mouse signal and sent to the RS232 signal output interface. If it is judged as invalid PS/2 mouse signal, it will be controlled by 5V power supply The semiconductor switch powers on the external PS/2 mouse again, and repeats the above process until an effective PS/2 mouse signal is output.

The output channel indication unit is composed of a plurality of LED indicator lights, which are all connected to the switching control switch, and each LED indicator light corresponds to an RS232 signal output interface.

Both the first main control chip and the second main control chip are microcontroller chips.

Both the RS232 keyboard signal output channel gating chip and the RS232 mouse signal output channel gating chip are 5V bus switch chips.

The beneficial effects of the present invention are: the PS/2 keyboard and mouse switching device of the present invention can convert the PS/2 signals of the external keyboard and external mouse into RS232 signal output, and convert the output signal into RS232 signal while realizing the switching of keyboard and mouse. The signal is convenient for wiring and reception, and can extend the transmission distance to a certain extent. The PS/2 keyboard and mouse switching device of the present invention is used in conjunction with a plurality of "PS/2 keyboard and mouse simulators" near the computer, so that multiple computers share a set of external PS/2 keyboards and external PS/2 mice, and at any time Disconnection of the external PS/2 keyboard and external PS/2 mouse in any occasion will not affect the work of the computer, which not only improves resource utilization and reduces costs, but also is simple and convenient to operate and easy to implement in applications with limited space. The PS/2 keyboard and mouse switching device of the present invention is suitable for special application occasions where the keyboard and the mouse need to be relatively far away from the computer.

Description of drawings

FIG. 1 is a structural block diagram of a PS/2 keyboard and mouse switching device of the present invention.

Fig. 2 is a schematic diagram of the software flow of a PS/2 keyboard and mouse switching device of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a kind of PS/2 keyboard and mouse switching device of the present invention, by external PS/2 keyboard input interface, external PS/2 mouse input interface, PS/2 keyboard signal receiving and processing unit, PS/2 mouse It consists of a signal receiving and processing unit, a switching control switch, an output channel indicating unit, two 5V power semiconductor switches, and multiple RS232 signal output interfaces.

The PS/2 keyboard signal receiving and processing unit includes a first main control chip and an RS232 keyboard signal output channel gating chip, and the PS/2 mouse signal receiving and processing unit includes a second main control chip and an RS232 mouse signal output channel gating chip; The output channel indication unit includes a plurality of LED indicator lights. The number of LED indicator lights depends on the number of RS232 signal output interfaces. Each LED indicator light corresponds to an RS232 signal output interface.

The external PS/2 keyboard is connected with the external PS/2 keyboard input interface, the external PS/2 keyboard input interface is connected with the PS/2 keyboard signal receiving and the first main control chip in the processing unit, and the first main control chip is connected with the RS232 keyboard signal The output channel gating chip is connected; the external PS/2 mouse is connected with the external PS/2 mouse input interface, and the external PS/2 mouse input interface is connected with the second main control chip in the PS/2 mouse signal receiving and processing unit, and the second The main control chip is connected with the RS232 mouse signal output channel selection chip; each RS232 signal output interface is connected with the RS232 keyboard signal output channel selection chip and the RS232 mouse signal output channel selection chip.

One of the two 5V power semiconductor switches is respectively connected to the external PS/2 keyboard input interface and the first main control chip in the PS/2 keyboard signal receiving and processing unit, and the other of the two 5V power semiconductor switches is respectively connected to the external PS The /2 mouse input interface and the PS/2 mouse signal receiver are connected to the second main control chip in the processing unit.

The switching control switch is respectively connected with the first main control chip in the PS/2 keyboard signal receiving and processing unit and the second main control chip in the PS/2 mouse signal receiving and processing unit.

A plurality of LED indicator lights in the output channel indication unit are all connected with the switching control switch.

In this embodiment, the first main control chip in the PS/2 keyboard signal receiving and processing unit and the second main control chip in the PS/2 mouse signal receiving and processing unit all use microcontroller (MCU) chips.

In this embodiment, the RS232 keyboard signal output channel gating chip in the PS/2 keyboard signal receiving and processing unit, and the RS232 mouse signal output channel gating chip in the PS/2 mouse signal receiving and processing unit all use 5V bus switch chips .

As shown in Figure 2, after power-on, the first main control chip in the PS/2 keyboard signal receiving and processing unit initializes and delays 590ms to supply power to the external PS/2 keyboard by controlling the 5V power semiconductor switch, and the first main control chip The analog computer initializes and enables the external PS/2 keyboard through the external PS/2 keyboard input interface, releases the clock line and data line of the external PS/2 keyboard, and reads the self-test pass instruction uploaded by the external PS/2 keyboard and device ID, complete the initial setting of the external PS/2 keyboard and send corresponding commands to enable the external PS/2 keyboard to make it enter the normal working state; after triggering the external PS/2 keyboard, the first main control chip reads the external The PS/2 keyboard signal uploaded by the PS/2 keyboard is stored, and at the same time, the state of the switching control switch is checked cyclically and the switching position is judged. The corresponding RS232 signal output interface is gated through the RS232 keyboard signal output channel strobe chip and the RS232 signal is lit at the same time. The LED indicator corresponding to the output interface. At this time, the first main control chip will judge the received PS/2 keyboard signal. If it is judged to be a valid PS/2 keyboard signal, it will be encoded and added to the communication check byte. And data statistics bytes are converted to RS232 keyboard signals and output through the RS232 signal output interface. Before sending, pull down the clock line of the external PS/2 keyboard to suppress its communication, and release the clock line after sending. If it is judged to be invalid The PS/2 keyboard signal controls the 5V power supply semiconductor switch to power on the external PS/2 keyboard again, and repeats the above process until an effective PS/2 keyboard signal is output to ensure the correctness of the RS232 keyboard signal sent to the computer. RS232 keyboard signal has communication check byte and data statistics byte.

Similarly, after power-on, the second main control chip in the PS/2 mouse signal receiving and processing unit initializes and delays 590ms to supply power to the external PS/2 mouse by controlling the 5V power semiconductor switch, and the second main control chip simulates the computer through The external PS/2 mouse input interface initializes and enables the external PS/2 mouse, releases the clock line and data line of the external PS/2 mouse, and reads the self-test pass command and device ID uploaded by the external PS/2 mouse at the same time , complete the initialization settings of the external PS/2 mouse and send corresponding commands to enable the external PS/2 mouse to enter the normal working state; after triggering the external PS/2 mouse, the second main control chip reads the external PS/2 The PS/2 mouse signal uploaded by the mouse is stored, and at the same time, the status of the switching control switch is checked cyclically and the switching position is judged. The corresponding RS232 signal output interface is gated through the RS232 mouse signal output channel and the corresponding RS232 signal output interface is lit. At this time, the second main control chip will judge the received PS/2 mouse signal, if it is judged to be a valid PS/2 mouse signal, it will be encoded, and the communication check byte and data statistics will be added. After the byte is converted to RS232 mouse signal output through the RS232 signal output interface, pull down the clock line of the external PS/2 mouse to suppress its communication before sending, and release the clock line after sending, if it is judged as invalid PS/2 The mouse signal is to re-power the external PS/2 mouse by controlling the 5V power semiconductor switch, and repeat the above process until an effective PS/2 mouse signal is output to ensure the correctness of the RS232 mouse signal sent to the computer, and the output RS232 mouse signal With communication check bytes and data statistics bytes.

The PS/2 keyboard and mouse switching device of the present invention is used in conjunction with a plurality of "PS/2 keyboard and mouse simulators" near the computer, so that multiple computers share a set of external PS/2 keyboards and external PS/2 mice, and at any time In any case, the disconnection of the external PS/2 keyboard and external PS/2 mouse will not affect the computer work. In the PS/2 keyboard and mouse switching device of the present invention, each RS232 signal output interface is correspondingly connected with a PS/2 keyboard and mouse simulator respectively, and the PS/2 keyboard and mouse simulator can adopt the prior art, and the PS/2 keyboard and mouse simulator is used for Receive the RS232 keyboard signal and the RS232 mouse signal output by the RS232 signal output interface in the PS/2 keyboard and mouse switching device of the present invention, simultaneously convert the received RS232 keyboard signal into an emulated PS/2 keyboard signal, convert the RS232 mouse signal into The simulated PS/2 mouse signal is output to the corresponding computer.

Claims (4)

1. A PS/2 keyboard and mouse switching device is characterized in that, comprising: The PS/2 keyboard signal receiving and processing unit composed of the first main control chip and the RS232 keyboard signal output channel gating chip, the external PS/2 keyboard input interface connected with the first main control chip, and the first main control chip respectively A 5V power semiconductor switch connected to the external PS/2 keyboard input interface, a PS/2 mouse signal receiving and processing unit composed of the second main control chip and the RS232 mouse signal output channel gating chip, connected to the second main control chip The external PS/2 mouse input interface, another 5V power semiconductor switch connected to the second main control chip and the external PS/2 mouse input interface, and the switch control switch connected to the first main control chip and the second main control chip respectively A switch, an output channel indicating unit connected to the switching control switch, a plurality of RS232 signal output interfaces; each RS232 signal output interface is connected with the RS232 keyboard signal output channel gating chip and the RS232 mouse signal output channel gating chip; The external PS/2 keyboard is connected to the system through the external PS/2 keyboard input interface. After the first main control chip is initialized, it delays 590ms to supply power to the external PS/2 keyboard by controlling the 5V power semiconductor switch, and the analog computer releases the external PS/2 keyboard. The clock line and data line of the keyboard, read the self-test uploaded by the external PS/2 keyboard and pass the instruction and device ID, complete the initialization setting of the external PS/2 keyboard and send the corresponding command to enable the external PS/2 keyboard to make it enter the normal state After triggering the external PS/2 keyboard, the first main control chip reads the PS/2 keyboard signal uploaded by the external PS/2 keyboard and stores it. The keyboard signal output channel strobe chip strobes the corresponding RS232 signal output interface and at the same time indicates the strobe status through the output channel indicator unit. The first main control chip judges the received PS/2 keyboard signal. If it is judged to be a valid PS /2 keyboard signal is encoded, and converted into RS232 keyboard signal after adding communication check byte and data statistics byte, output through the RS232 signal output interface, if it is judged to be invalid PS/2 keyboard signal, control the 5V power supply The semiconductor switch powers on the external PS/2 keyboard again, and repeats the above process until a valid PS/2 keyboard signal is output; The external PS/2 mouse is connected to the system through the external PS/2 mouse input interface, and the second main control chip delays 590ms after initialization to supply power to the external PS/2 mouse by controlling the 5V power semiconductor switch, and the analog computer releases the external PS/2 mouse. The clock line and data line of the mouse, read the self-test uploaded by the external PS/2 mouse, pass the command and device ID, complete the initialization setting of the external PS/2 mouse and send the corresponding command to enable the external PS/2 mouse to make it enter the normal state After triggering the external PS/2 mouse, the second main control chip reads the PS/2 mouse signal uploaded by the external PS/2 mouse and stores it. The mouse signal output channel strobe chip strobes the corresponding RS232 signal output interface and at the same time indicates the strobe status through the output channel indicator unit. The second main control chip judges the received PS/2 mouse signal. If it is judged to be a valid PS /2 mouse signal is coded, and converted into RS232 mouse signal after adding communication check byte and data statistics byte, output through the RS232 signal output interface, if it is judged as invalid PS/2 mouse signal, control the 5V power supply The semiconductor switch powers on the external PS/2 mouse again, and repeats the above process until an effective PS/2 mouse signal is output. 2. A kind of PS/2 keyboard mouse switching device according to claim 1, it is characterized in that, described output channel indicator unit is made up of a plurality of LED indicator lights, and a plurality of LED indicator lights are all connected with switching control switch, each Each LED indicator corresponds to an RS232 signal output interface. 3. A PS/2 keyboard and mouse switching device according to claim 1, characterized in that, both the first main control chip and the second main control chip are microcontroller chips. 4. A kind of PS/2 keyboard-mouse switching device according to claim 1, it is characterized in that, described RS232 keyboard signal output channel gating chip and RS232 mouse signal output channel gating chip all adopt 5V bus switch chip.