Abstract: A method for operating a KVM switch with independent OSD and control channels comprises the steps of: receiving a functional instruction from the operation and control device; outputting a switch signal to turn off the picture of the selected computer, and starting the channel for the OSD signals; retrieving a pre-stored OSD background picture, and outputting the OSD background video signal and the control command to the OSD processing chip and OSD video switching circuit, and displaying via the monitor; inputting a functional instruction to select an OSD operation picture; outputting the selected OSD operating picture to the OSD processing chip and then to the monitor; inputting a functional instruction to stop the OSD operation; the OSD control system unit enabling the OSD video switching circuit to turn off the channel of the OSD signals, and controlling to switch back to the picture of the computer.

Abstract: A control method for extender is proposed. A transmitting unit stops outputting image signal, voice signal or serial data to a receiving unit. A request signal is sent from the transmitting unit to the receiving unit by using the circuit through which the transmitting unit stops outputting image signal, voice signal or serial data to the receiving unit. Extended display identification data of a display device or peripheral data of a control device is sent from the receiving unit to the transmitting unit.

Abstract: A KVM switch apparatus with bridging function includes a processor with a keyboard connection interface and a mouse connection interface; a keyboard/mouse switching circuit; a USB bridge unit and at least one computer interface unit electrically connected to at least one computer. The keyboard/mouse switching circuit and the USB bridge unit are selectively connected, whereby a switching of bridging channels is provided between at least two computers.

Abstract: A programmable controlled computer switch is disclosed. Console devices and universal serial bus devices of the computer switch can be switched as having a controlling function or a hub function. The computer switch includes a console port interface having console ports for connecting console devices, which initially have a controlling function; a universal serial bus hub port interface having hub ports for connecting universal serial bus devices, which initially have a hub function; plural computer interfaces having a computer port respectively for connecting a computer device; a matrix switching circuit connected to the console port interface, the universal serial bus hub port interface and the plural computer interfaces; and a main controlling circuit connected between the matrix switching circuit and the plural computer interfaces.

Abstract: A KVM switch of universal input and programmable USB hub includes a main control unit (MCU) chip and a switching control method are disclosed. The KVM switch has a MCU circuit for controlling functions of the KVM switch, complete reports of console I/O devices, reading and corresponding transmissions of descriptors; a console device interface chip connected to the MCU; a console port, connected to the console device interface chip; a computer interface chip, connected to the MCU; a re-assignment USB hub chip, connected to the computer interface chip; and a computer port, connected to the re-assignment USB hub chip. Console USB I/O interfaces become dynamic and universal, such that the console I/O devices connected to the control port correspond to the computer port to provide full compatibility, and the console ports can be connected to various console I/O devices without any limitation of device types.

Abstract: A method for operating a KVM switch with independent OSD and control channels comprises the steps of: receiving a functional instruction from the operation and control device; outputting a switch signal to turn off the picture of the selected computer, and starting the channel for the OSD signals; retrieving a pre-stored OSD background picture, and outputting the OSD background video signal and the control command to the OSD processing chip and OSD video switching circuit, and displaying via the monitor; inputting a functional instruction to select an OSD operation picture; outputting the selected OSD operating picture to the OSD processing chip and then to the monitor; inputting a functional instruction to stop the OSD operation; the OSD control system unit enabling the OSD video switching circuit to turn off the channel of the OSD signals, and controlling to switch back to the picture of the computer.

Abstract: The present invention relates to an automatic mapping and updating computer switch device. The computer switching device provides the compatibility between a plurality of devices and a plurality of computers, and comprises a USB host chip connected to the plurality of peripheral devices each containing a USB connector for sending the necessary data (USB device descriptor/report) to a plurality of USB device chips, thus, the computers can acquire the necessary data of the peripheral devices through the connected USB device chips. Whenever the computer switching device re-boots or any of the peripheral devices are plugged in/pulled out, the USB host chip reads the new necessary data again with the previous ones, if any differences are found, the new necessary data is send to the USB device chips for storage. The aforesaid procedure is called DDM (Dynamic Devices Mapping) or full USB Enumeration or full USB Initiation.

Abstract: A control method for extender is proposed. A transmitting unit stops outputting image signal, voice signal or serial data to a receiving unit. A request signal is sent from the transmitting unit to the receiving unit by using the circuit through which the transmitting unit stops outputting image signal, voice signal or serial data to the receiving unit. Extended display identification data of a display device or peripheral data of a control device is sent from the receiving unit to the transmitting unit.

Abstract: A KVM switch of universal input and programmable USB hub includes a main control unit (MCU) chip and a switching control method are disclosed. The KVM switch has a MCU circuit for controlling functions of the KVM switch, complete reports of console I/O devices, reading and corresponding transmissions of descriptors; a console device interface chip connected to the MCU; a console port, connected to the console device interface chip; a computer interface chip, connected to the MCU; a re-assignment USB hub chip, connected to the computer interface chip; and a computer port, connected to the re-assignment USB hub chip. Console USB I/O interfaces become dynamic and universal, such that the console I/O devices connected to the control port correspond to the computer port to provide full compatibility, and the console ports can be connected to various console I/O devices without any limitation of device types.

Abstract: The present invention relates to a method for automatic mapping and updating of computer switching devices, wherein the computer switching device is electrically connected with a plurality of peripheral devices and computers via a USB host MCU and a plurality of USB device MCUs that are connected. For non-standard USB devices or USB standard enumeration and parsing unable to be processed by built-in firmware, the USB host MCU transfers special requirements to a computer, receive and convert feedbacks, and transmit them to external peripheral devices to perform enumeration and connection processes and store them in the USB host MCU. For special communication requirements of computers, the USB device MCU performs a reverse process, and decides to map and update automatically to connect USB peripheral devices with computers successfully, thus increasing applicability of products, prolonging their service life and reducing consumption of resources for the benefit of environmental protection.

Abstract: A programmable controlled computer switch is disclosed. Console devices and universal serial bus devices of the computer switch can be switched as having a controlling function or a hub function. The computer switch includes a console port interface having console ports for connecting console devices, which initially have a controlling function; a universal serial bus hub port interface having hub ports for connecting universal serial bus devices, which initially have a hub function; plural computer interfaces having a computer port respectively for connecting a computer device; a matrix switching circuit connected to the console port interface, the universal serial bus hub port interface and the plural computer interfaces; and a main controlling circuit connected between the matrix switching circuit and the plural computer interfaces.

Abstract: A KVM switch of universal input and programmable USB hub includes a main control unit (MCU) chip, having a MCU circuit for controlling functions of the KVM switch, complete reports of console input devices, reading and corresponding transmissions of descriptors; a console device interface chip connected to the MCU; a console port, connected to the console device interface chip; a computer interface chip, connected to the MCU; a re-assignment USB hub chip, connected to the computer interface chip; and a computer port, connected to the re-assignment USB hub chip. Console USB I/O interfaces become dynamic and universal, such that USB devices connected to the control end correspond to the computer port to provide full compatibility, and the console ports can be connected to various USB devices without any limitation of device types, and the devices can be replaced freely during their operation to provide convenient operations and applications.

Abstract: A KVM switch apparatus with bridging function includes a processor with a keyboard connection interface and a mouse connection interface; a keyboard/mouse switching circuit; a USB bridge unit and at least one computer interface unit electrically connected to at least one computer. The keyboard/mouse switching circuit and the USB bridge unit are selectively connected, whereby a switching of bridging channels is provided between at least two computers.

Abstract: A KVM switch apparatus with bridging function includes a processor with a keyboard connection interface and a mouse connection interface; a keyboard/mouse switching circuit; a USB bridge unit and at least one computer interface unit electrically connected to at least one computer. The keyboard/mouse switching circuit and the USB bridge unit are selectively connected, whereby a switching of bridging channels is provided between at least two computers.

Abstract: The present invention relates to an automatic mapping and updating computer switch device. The computer switching device provides the compatibility between a plurality of devices and a plurality of computers, and comprises a USB Host Chip connected to the plurality of peripheral devices each containing a USB connector for sending the necessary data (USB device descriptor/report) to a plurality of USB Device Chips, thus, the computers can acquire the necessary data of the peripheral devices through the connected USB Device Chips. Whenever the computer switching device re-boots or any of the peripheral devices are plugged in/pulled out, the USB Host Chip reads the new necessary data again with the previous ones, if any differences are found, the new necessary data is send to the USB Device Chip for storage. The aforesaid procedure is called DDM (Dynamic Devices Mapping) or full USB Enumeration or full USB Initiation.

Abstract: The present invention relates to a KVM switch with separate on-screen display and control channels, particularly to the KVM switch is connected to a plurality of computers, monitors and operation devices. The KVM switch comprises a switch circuit connected with the computers, a video switch circuit connected with the switch circuit for sending a signal to the monitors, a separate control system connected to the video switch circuit for receiving a function command from the operation devices, and a video control and display unit connected to the separate control system for producing and sending a video signal and synchronous signal to the monitors through the video switch circuit.

Abstract: The present invention relates to an automatic mapping and updating computer switch device. The computer switching device provides the compatibility between a plurality of devices and a plurality of computers, and comprises a USB host chip connected to the plurality of peripheral devices each containing a USB connector for sending the necessary data (USB device descriptor/report) to a plurality of USB device chips, thus, the computers can acquire the necessary data of the peripheral devices through the connected USB device chips. Whenever the computer switching device re-boots or any of the peripheral devices are plugged in/pulled out, the USB host chip reads the new necessary data again with the previous ones, if any differences are found, the new necessary data is send to the USB device chips for storage. The aforesaid procedure is called DDM (Dynamic Devices Mapping) or full USB Enumeration or full USB Initiation.

Abstract: A switchable cable device suitable for connecting between an electronic device and an external peripheral device for signal transmission is disclosed. The switchable cable device comprises a cable having a connection at a side for electrically connecting to the electronic device and at least two branches disposed on another side thereof. Each branch has a connector and at least one extensional connector. The extensional connectors and connectors have circuit boards and chips which can independently renew an activation program.

Abstract: A KVM switch is disclosed to include a housing, VGA ports arranged in pair on front and back panels of the housing for selectively installation of PCs in the front or back side of the housing, switching keys and indicator lights mounted on the front panel of the housing corresponding to the pairs of VGA ports, and a control unit mounted inside the housing to automatically scan connection of KVM cables to the VGA ports and to automatically switch off the corresponding VGA port on the front (or back) side of the housing when one VGA port on the back (or front) side of the housing is connected with the KVM cable.

Abstract: A KVM switch with an expansion module slot is disclosed. The KVM switch comprises a housing, a printed circuit board and an expansion module slot. The housing includes a receiving space, a panel disposed at a side thereof and a removable back panel disposed at another side thereof. The printed circuit is disposed in the receiving space, and comprises a controller, a switching circuit, a plurality of connectors and a plurality of wires. The expansion module slot is disposed corresponding to the back panel and is used for receiving an expansion module.