61 results about "PS/2 port" patented technology

An ethernet converter enables computers with an ethernet connection to connect to a network on a two-wire system. The converter comprises a device installed behind a wall plate that employs an RJ11 port. The converter may comprise indicator lights, which notifies the user of the status of the converter. The converter may comprise a cable for connecting the computer to the device, and for connecting the device to a power source, which may be a USB port or a PS / 2 port of the computer, or an AC / DC adapter connected to an AC power source.

The invention discloses a coder interface testing device based on a Nios II processor. The device comprises an FPGA (Field Programmable Gate Array) chip, an incremental TTL (Transistor Transistor Logic) interface module, an incremental sine and cosine interface module, an absolute interface module, a display screen and a PS (Poly Styrene) / 2 interface device, wherein the incremental TTL interface module, an incremental sine and cosine interface module, an absolute interface module, a display screen and a PS / 2 (Purple Green) interface device are connected with the FPGA chip; the incremental TTL interface module is used for being connected with the coder of an incremental TTL interface type, the incremental sine and cosine interface module is used for being connected with the coder of an incremental sine and cosine interface type, the absolute interface module is used for being connected with an absolute coder so that a serial digital signal output by the absolute interface module is transformed between a differential signal and a single-end signal, and the FPGA chip comprises a Nios II processor embedded in a chip, and the Nios II processor is used for processing an input signal and realizing the testing of coder interfaces. The Nios II processor-based coder interface testing device can be used for solving the problems that the coder interfaces in the existing coder testing platform can not be mutually compatible and are inconveniently carried, and has the characteristics of low cost, strong function, small volume, compact structure and high integration.

A modem interface device is coupled to a computer such that the device is powered via a power signal received from a bus port of the computer, such as a Universal Serial Bus (USB) port, a RS-232 port, or a PS-2 port. The modem interface device has a telephone base connector, a modem connector, a power connector, a two-to-four-wire converter circuit, and a power distribution circuit. The two-to-four-wire converter circuit bidirectionally couples signals between the telephone base connector and the modem connector. The power distribution circuit receives electrical power from the power connector and supplies power to the two-to-four-wire converter circuit.

The invention discloses a PS / 2 keyboard and mouse simulator, relates to the field of computers and solves the problem that a PS / 2 interface is limited in application when distance between a computer and a control console is long or operating space is limited due to the fact that PS / 2 signal transmission distance is limited. The PS / 2 keyboard mouse simulator is composed of an RS232 signal input interface, a PS / 2 keyboard signal simulating and processing unit, a PS / 2 mouse signal simulating and processing unit, a PS / 2 keyboard signal output interface and a PS / 2 mouse signal output interface. The PS / 2 keyboard and mouse simulator is easy in wiring and long in transmission distance, the computer can be ensured to still be capable of being correctly started without being connected with a real PS / 2 keyboard and a PS / 2 mouse; the RS232 signal input interface is adopted, so that the PS / 2 keyboard and mouse simulator has no mutual conflict with the keyboard and the mouse with which the computer is connected externally.

A designated byte of a PS / 2 packet is used for data not recognized by a conventional PS / 2 port driver. Each packet byte received by the conventional port driver is read by an Interrupt Service Routine (ISR) of a filter driver. If a received packet contains an unrecognized data type, that data is extracted. The filter driver converts the byte containing the data to 0000 0000. The port driver provides the all-zero byte to a higher level driver for processing into a subsequent data structure. A Service Callback Routine of the filter driver receives that data structure from the higher level driver. Depending upon the type of unrecognized data extracted by the ISR, that data is then either inserted into the data structure or passed independently of that data structure to a user level application.

The invention relates to a key control system of a Doppler ultrasonic diagnosis instrument. The key control system is connected with a color ultrasonograph host computer, and comprises a single-chip computer control module, a key module, a TGC (time grain compensation) module, a light-emitting diode (LED) display module and a sound generating module. The key control system has the characteristics that: an LED intelligent display chip is used for controlling the display of a backlight lamp, therefore the overall brightness adjustment of the backlight lamp can be realized and on / off of each LED can be controlled separately; single-chip computer control is adopted to achieve the synchronization technology of the state indication lamp in the key and the host computer state, and working mode and adjusting mode indication lamps are used to achieve better human-computer interaction; and by adopting PS / 2 interface to connect with a computer, the external connection of other keys are avoided in the setting process of basic input output system (BIOS), and the installation and maintenance become more convenient and rapider.

The invention relates to a checking device of PS / 2 interface and relative method, wherein said checking device comprises one single-chip micro processor, one PS / 2 interface terminal and several LED instruct lamps; the single-chip micro processor is connected to the data end and clock end of PS / 2 interface; said LED instruct lamp is connected to the micro processor, to simulate the function of keyboard instruct lamp; and said checking method comprises: using the instruction preset at micro processor to simulate hand-operated key to send second keyboard scan code, and use keyboard controller to translate it into first scan code; then judging if they are relative. The invention can replace hand-operated key press operation to save cost and time.

The invention discloses an FPGA-based onboard system realization method. The method comprises the steps of S1, establishing a processor module, wherein the processor module comprises a controller anda data path; S2, establishing an FPGA device module, wherein the FPGA device module comprises a PS / 2 interface, an RS232 interface, a VGA interface, a 7-section LED display screen, an LED display screen, a Switch, a Button, an on-chip ROM, a bus interface and IO control logic; S3, establishing an onboard memory module, wherein the onboard memory module comprises a VRAM and a memory; and S4, combining circuits of the processor module, the FPGA device module and the memory module into a stream file, and programming the stream file in an FPGA. The method has the advantages in two aspects that therealization efficiency is high: hardware resources provided by the FPGA are rich, and designed computer system hardware can be quickly realized on the FPGA, so that the realization efficiency is higher; and the flexibility is high: the FPGA is reconfigurable, so that when partial hardware parameters of the computer system hardware are changed, reconfiguration can be performed during operation, namely, the computer system hardware realized through the FPGA is more flexible.

The invention discloses a card reader compatible to contact and noncontact IC (integrated circuit) cards. The card reader comprises a master control chip, a safety module, a voltage stabilizing power supply chip, a USB (universal serial bus) interface, an analog front end chip and a noncontact intelligent IC read-write chip. A contact card seat is connected with a master control chip through the analog front end chip; a buzzer and three indicator lights are connected with the master control chip through I / O interfaces; three PSAM card seats are extended from the safety module, an LCD (liquid crystal display) screen and a code keyboard are externally connected with the master control chip through a PS / 2 interface, and the noncontact intelligent IC read-write chip is connected with the master control chip through a serial peripheral interface; the USB interface supplies power to the master control chip through the voltage stabilizing power supply chip. The card reader in USB communication is a drive-free plug-and-play card reader and quick and convenient to use and can be externally connected with the liquid crystal display screen and the code keyboard to achieve convenience in use.