40 results about "Serial port" patented technology

The invention relates to a GSM network-based access control system, which comprises: an AVR single-chip microcomputer and a GSM embedded module. Specifically, the AVR single-chip microcomputer is a core control chip of the system, and the GSM embedded module is responsible for the GSM communication of the whole system. The AVR single-chip microcomputer is in connection with the GSM embedded module through a serial port, by which control command transmission and data receiving between the AVR single-chip microcomputer and the GSM embedded module can be conducted. The GSM embedded module collects information about a fixed-line telephone incoming call, a mobile phone incoming call or a short message of a user. By combining the wireless GSM network communication technology and voice/image processing technology, the access control system puts forward a wireless access control system based on a GSM, solves the existing access control system line problem, and substitutes the content of an original indoor unit and line. And only a mobile phone or fixed-line telephone is needed in each household, and this can be satisfied in each common family. Therefore, the installation cost is substantially reduced already. The invention also relates to an access control method.

The invention discloses a UART (universal asynchronous receiver/transmitter) serial port communication method based on GPIO (general purpose input/output) handshake and EDMA (enhanced direct memory access). According to the method, data migration from transmitting and receiving FIFO of UART to an external data buffer is completed automatically on the basis of an EDMA function, and frequent intervention of CPU (central processing unit) is not needed; a receiving terminal is informed through GPIO handshake signals to receive data packets, and the boundaries of the received data packets can be rapidly distinguished and an address of a next to-be-received data packet can be automatically updated; therefore, the efficiency of communication adopting UART serial ports is greatly improved, frequent interruption to CPU processing is reduced when the UART transmits and receives the data pockets, and the utilization rate of CPU resources can be increased. Meanwhile, according to the scheme, the GPIO signals are utilized to have an appointment with opposite terminal equipment, and convenience produced when the opposite terminal equipment uses the UART for receiving is improved to a certain degree, so that the work efficiency of communication adopting the UART serial ports is improved at the level of the overall system.

The invention relates to a high-speed serial port load automatic calibration circuit. One end of a port load resistor array of the high-speed serial port load automatic calibration circuit is connected with an analog power supply, the other end is connected with an input end of a first current source, and an output end of the first current source is connected to the ground; one end of a high-precision resistor is connected with an analog power supply, the other end is connected with an input end of a second current source, and an output end of the second current source is connected to the ground; one end of a high-speed serial port resistor array is connected with an analog power supply; a negative input end of a comparator is connected between the port load resistor array and the first current source, a positive input end is connected between the high-precision resistor and the second current source, the comparator compares voltage values of the high-precision resistor and the port load resistor array and outputs a comparison result signal to a digital state machine, the digital state machine generates a control signal to control resistance of the port load resistor array and the high-speed serial port resistor array. The high-speed serial port load automatic calibration circuit provided by the invention realizes automatic calibration of the high-speed serial port load resistor, and achieves an impedance matching effect of a high-speed serial port.

The invention relates to a tiled grating displacement error monitoring system, which comprises a grating tiling device for mounting a tiled grating, wherein a fine adjuster platform of the grating tiling device is provided with a piezoceramics driver; two polar plates of a first digital capacitance micro-displacement sensor are oppositely arranged on positions in the horizontal direction of a coarse adjuster platform and a lower platform of the fine adjuster respectively; two polar plates of a second digital capacitance micro-displacement sensor are oppositely arranged on positions perpendicular to the lower platform and an upper platform of the fine adjuster respectively; output ends of the first and second digital capacitance micro-displacement sensors are connected with the input end of a signal sample circuit; the output end of the signal sample circuit is connected with the input end of a controller of a singlechip; the output end of the singlechip is connected with a PC through a serial port communication circuit; and the output end of the PC is connected with the control end of the piezoceramics driver through a D/A converter.

The invention discloses an activation method of mobile terminal modules, which consists of the following steps: a: a first module sends interrupt pulse or interrupt level to a second module; b after receiving the interrupt pulse or the interrupt level, the second module checks and records the state of the first module and updates the state thereof according to the state. In the invention, becausethe hardware interrupts mode is adopted to activate the activated module; the situation that the transmission of AT command by serial ports for triggering interrupt tends to make transmission mistakes is avoided. The interrupt triggering of the invention is more stable. The invention also discloses a multi-mode terminal.

The invention discloses a test system of a temperature sensor. The test system comprises a computer, a thermoelectric couple and thermal resistance tester, and a temperature sensor test platform, wherein the computer is connected with the thermoelectric couple and the thermal resistance tester through a serial port line; the temperature sensor test platform comprises a plurality of sample fixture sockets, a plurality of ohm gauge measuring openings, a self-setting control key, a computer serial port and an ohm gauge communication serial port; the sample fixture sockets, the ohm gauge measuring openings, the self-setting control key and the ohm gauge communication serial port are respectively connected with the computer through serial port lines; the temperature sensor test platform works according to the following steps of: (1) powering on and detecting; (2) setting; (3) measuring; and (4) matching. According to the test system disclosed by the invention, a multi-position automatic switchover measurement of the samples is realized and the whole switchover and measurement process is automatic, so that the work efficiency is improved, the production cost is reduced and a test result is visual and precise.

The invention discloses an interface level switch device. The interface level switch device is arranged on a main board and is used for detecting serial port signals and outputting level signals corresponding to a main board serial port controller of a serial port controller. The interface level switch device comprises a detecting module, a circuit switching module and an RS232 level conversion module, wherein the detecting module is used for detecting the serial port input signals so as to judge the type of the serial port input signals and outputs corresponding control signals according to judgment results; the circuit switching module comprises a logic control pin, an input end, a first group of output ends and a second groups of output ends, and the logical control pin receives the control signals sent by the detecting module and makes the input end selectively judge whether the serial port input signals are output from the first output ends or the second output ends; the RS232 level conversion module is connected with the first group of output ends of the circuit switching module and is used for converting RS232 serial port signals into CMOS signals and outputting the CMOS signals to the main board serial port controller.

The invention relates to a serial communication checking and correction method. The serial communication checking and correction method employs an ECC (error checking and correction) mode to a serialcommunication checking and correction process and comprises: 1) saving, by a serial data transmitter, a frame of serial data to a transmitting buffer area; 2) calculating ECC codes of data frames in the serial port transmitting buffer area; 3) saving, by a serial data receiver, the received serial data to a receiving buffer area, and saving the received transmitter ECC codes to an ECC buffer area;4) calculating ECC codes of data frames in the serial port receiver buffer area; 5) subjecting the calculated transmitter ECC codes and receiver ECC codes to logic XOR operation, judging whether communication errs according to processing results, and correcting error information. The serial communication checking and correction method is particularly suitable for use in embedded service environments, especially in industrial liquid crystal displays that require transmission of mass data.

The invention discloses a server physical serial port sharing system and serial port sharing method, and relates to the technical field of servers. The switching operation of a system serial port anda debugging serial port can be carried out through a serial port input command in a server debugging process; BMC serial port information is obtained without opening a case cover plate; a scheme simple to realize and convenient to use is provided for sharing a serial communication port by the system serial port and the debugging serial port of a server; and therefore, the debugging efficiency is greatly improved, the manual operation is reduced, and the later maintenance is more convenient.

The invention provides a transponder aging test system comprising message reading-writing tools, multi-channel C interface output tools, an upper computer and serial port servers. The upper computer communicates with the message reading-writing tool by the serial port server. Each transponder corresponds to one message reading-writing tool; and the message reading-writing tools are able to carry out message reading and writing testing on default message parts of passive transponders or active transponders. Built-in messages are arranged in the multi-channel C interface output tools; and the multi-channel C interface output tools are controlled to be turned on or off by upper computer software and send messages to the active transponders. The upper computer software controls on/off of message sending of the multi-channel C interface output tools and controls the message reading-writing tools to carry out message reading and writing testing. The system is able to monitor the running states of multiple transponders in real time; high-efficiency batched aging testing is realized; and the integration of the system is improved greatly.

The invention discloses an Ethernet-based unmanned aerial vehicle formation flight control data link system and belonging to the technical field of unmanned aerial vehicle formation control. The Ethernet-based unmanned aerial vehicle formation flight control data link system includes a ground station computer, a wireless data transmission ground terminal and a wireless data transmission airborne terminal. The wireless data transmission airborne terminal is mounted on an unmanned aerial vehicle and connected to a serial port of the airborne computer of the unmanned aerial vehicle. The wirelessdata transmission ground terminal and the wireless data transmission airborne terminal form a one-to-one communication link, and the wireless data transmission ground terminal is connected to an Ethernet serial port server through a serial port level conversion module, and the Ethernet serial port server and the ground station computer are respectively connected to an Ethernet switch through a network cable to form an Ethernet local area network. According to the Ethernet-based unmanned aerial vehicle formation flight control data link system, mature hardware, such as wireless data transmission, the serial port server and the Ethernet switch, is selected for construction to provide a data chain solution with reliable work, strong performance and controllable cost for an unmanned aerial vehicle formation operation control system.

The invention discloses a power line carrier communication apparatus used for overocean communication. The apparatus comprises a carrier transmitting terminal, a carrier receiving terminal and a neutral buoyancy cable. The carrier transmitting terminal emits a carrier signal and the carrier signal is transmitted to the carrier receiving terminal through the neutral buoyancy cable so as to be received. The carrier transmitting terminal comprises an upper computer serial interface, a master control chip, a power line carrier modulation module, an emission coupling circuit and a coupling transformer. The carrier receiving terminal comprises the upper computer serial interface, the master control chip, the power line carrier demodulation module, a receiving coupling circuit and a decoupling transformer. The neutral buoyancy cable is a light-buoyancy-material counter-weight coaxial cable. In the invention, during communication, a special communication cable is not added so that engineering cost and construction difficulty are greatly reduced; multichannel coupling is used so as to reach a high parallel communication rate; independent coupling and decoupling circuits of each channel guarantee effective modulation and demodulation of each independent channel carrier wave; and the special coaxial cable is used so that communication reliability is increased.

The invention provides an Ethernet gateway, an Ethernet gateway equipment, and an Ethernet gateway system, and relates to the communication field. The problem of the prior art of inability of satisfying increasing use demands of users caused by a single gateway function is solved, and the multifunctionality of the Ethernet gateway is realized, and the adaptability and the application range of the Ethernet gateway are improved. The Ethernet gateway comprises an Ethernet main control board, which comprises an Ethernet interface, an Ethernet isolation transformer, an Ethernet controller, a microcontroller, a serial interface, a USB controller provided with a USB interface, an SD card slot interface, and a memory. The Ethernet interface, the Ethernet isolation transformer, and the Ethernet controller are sequentially connected together. The Ethernet controller, the serial interface, the USB controller provided with the USB interface, a peripheral power supply circuit, the SD card slot interface, and the memory are connected with the microcontroller.

The invention discloses an analog serial port communication method of a cooking utensil, which comprises the following steps: when an analog serial port of the cooking utensil receives data, startinga timer to interrupt; when the interruption of the timer reaches a first preset time, judging whether a start bit signal is normal or not; when the start bit signal is normal, starting the timer againfor interruption, and the interruption lasting for a second preset time; and taking the second predetermined time as a cycle period, and acquiring current data after circularly starting the timer tointerrupt for a predetermined number of times N. The invention further discloses a cooking utensil and a computer readable storage medium. The technical problem that an existing cooking utensil cannotbe in wireless communication with a mobile terminal can be solved.

The invention discloses a method for updating a set-top box. The method comprises the steps that a serial port update tool is connected with the set-top box; to-be-updated software is selected in the serial port update tool; the software is programmed into the set-top box by the serial port update tool through a serial port, so as to update the set-top box. The method has the advantage that the set-top box can be conveniently and safely updated with low cost.

The invention provides a serial port server and an implementation method of the serial port server, the serial port server comprises a main control unit and a plurality of serial port modules, the main control unit is in communication connection with each serial port module through a USB interface, each serial port module is provided with a plurality of serial ports, and each serial port module is in data communication with external serial port equipment through a serial port of the serial port module. According to the invention, a multi-serial-port module scheme is adopted, serial ports are distributed on a plurality of independent serial port modules, and the main control unit communicates with other serial port modules responsible for serial port services through a USB interface; through the measures, serial port interruption is undertaken by a plurality of independent serial port modules, and the main control unit is responsible for network interruption and a small amount of USB interruption, so that the problem that a single main control unit cannot realize a serial port server with a plurality of serial ports due to excessive network interruption and serial port interruption is solved, and the realization difficulty and cost of the multi-port serial port server are reduced.

A communication device mounted in each of a plurality of information processing devices connected to a fabric, the communication device comprises: a serial interface that transmits and receives a first packet compliant with a Peripheral Component Interconnect Express (PCIe) standard; a requester unit that acquires the first packet from the serial interface and converts the first packet that has been acquired into a second packet that is transmitted and received via the fabric among a plurality of the information processing devices sharing a memory space that is virtually extended by using a device identifier specific to each of the information processing devices; a fabric communication unit that transmits and receives the second packet via the fabric; and a completer unit that acquires the second packet from the fabric communication unit and generating a response packet to a request included in the second packet that has been acquired.

The invention discloses an image acquisition system, comprising an image acquisition and transmission module, an image processing and control module and a display module. The image acquisition and transmission module comprises an image sensor, an FIFO memory, a microcontroller and a serial port circuit. The image processing and control module comprises an RS232 serial port module, an image data acquisition module, an image storage module and an image processing module. The image sensor, the FIFO memory, the microcontroller, the serial port circuit and the RS232 serial port module are connectedin sequence. The RS232 serial port module, the image data acquisition module, the image storage module and the image processing module are connected in sequence. The image processing module is connected with the RS232 serial port module and the display module. According to the image acquisition system, the image information can be displayed rapidly and visually, a transmission speed is fast and an error is relatively low.

The invention provides a serial communication debugging method based on a test environment. The method comprises the following steps: installing a virtual single-chip microcomputer automatic serial port tool and a message configuration file in a computer; modifying the message configuration file according to a test environment requirement; enabling the single-chip microcomputer to be connected with a computer through a serial port line; starting an automatic serial port tool, and realizing serial port communication debugging through message automatic reply. The computer is used for simulating the MCU serial port, receiving and sending message pairs can be customized according to actual requirements, the field environment can be simulated, serial communication customized automatic reply is achieved, and follow-up debugging work is facilitated.

The invention discloses an automatic analysis and calculation device for tracking precision of a photoelectric turret. A display is connected with a calculation processing unit; an external controller is connected with the calculation processing unit through a USB, a serial interface or Bluetooth; the calculation processing unit comprises a video input interface module, a calculation processing module and a data storage module; a photoelectric turret video image input connecting wire is connected with a photoelectric turret video output port and the calculation processing unit, and the video input interface module accesses a photoelectric turret output video, uniformly converts the video into a digital image to be processed and transmits the digital image to the calculation processing module; and the external controller inputs the field angle and image resolution parameters of a tested photoelectric turret to the calculation processing module to control the operation and stop of the calculation processing module, and a result processed by the calculation processing module is sent to the data storage module to be stored. The device is wide in application range, can be set according to parameters of different photoelectric turrets, and is suitable for tracking precision testing of all photoelectric turrets at present.

The invention provides a black-start self-excitation checking device which comprises a power supply module, an embedded processor module and a serial port touch display control screen, according to the device, parameters of black-start electrical equipment are input into a serial port touch display control screen and transmitted to an embedded processor module, and the embedded processor module checks a self-excitation angle from the perspectives of a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm to comprehensively judge. When all conditions are not met and self-excitation occurs, the information which does not generate self-excitation is displayed through the serial port touch display control screen, and when any angle indicates that self-excitation occurs, the information which generates self-excitation is also displayed through the serial port touch display control screen, so that data basis is provided for black-start on-site workers, and the black start can be carried out under safe, controllable and reliable conditions.

The invention discloses an automatic debugging system of a portable calibrator and an automatic debugging method of the system, and belongs to the technical field of calibrator debugging. The system comprises an upper computer, the upper computer is connected with a combined calibrator through a network port, the upper computer is connected with a relay group connected with the combined calibratorthrough a serial port, the upper computer is connected with a to-be-tested calibrator connected with the relay group through a serial port, a measurement interface and an output interface of the combined calibrator are respectively and correspondingly connected with an output interface and a measurement interface of the to-be-tested calibrator, the upper computer controls each process of the debugging system, and the upper computer is connected with a printer through a USB connecting line. According to the system and method, various functions of the portable calibrator can be automatically debugged, the workload of operator is reduced, the working efficiency is improved, and influence of human factors is avoided.

The invention relates to a digital making multi-function control system, which relates to an improved computer network and communication in the field of mechanism industry. It has the following characters: time circuit is the time of all the system work, which uses crystal oscillator and electric capacity to lead CPU U1 system by interlock XTAL1.XTAL2; reset circuit adopts giving electricity and press key reset mode; series interface unit U2 adopts D0-D7 octet data bit and CPU U1 communication; display output unit U3 communicates with CPU U1 by DB0-DB7; input unit U4 is formed by keyboard array and input chips; keyboard array communicates with input chips by RL0-RL7; D0-D7 of input chips communicate with CPU U1.