Showing papers on "Serial port published in 2008"

Progressive power control of a multi-port memory device

Abstract: A method and system for progressively reducing the power consumption of a serial memory device is provided, called the power control system. The power control system monitors the ports of a multi-port serial memory so that they can be enabled or disabled on a per-port basis. When data is not being transmitted or received on a port, a series of steps are taken to progressively de-power portions of the port and cause the port to enter into a low-power state. By disabling certain ports and placing ports in a low-power state, the power consumption of the overall serial port memory is significantly reduced.

Wireless device provisioning hardware tool

Abstract: Systems and methods are disclosed for provisioning a position monitoring device. The position monitoring device may include a wireless communication modem and a first serial port. A provisioning device may be coupled to the position monitoring device through a serial connection. The provisioning device can include a memory, a second serial port, and a processor. In some embodiments, the provisioning device initiates an automatic configuration of the wireless communication modem through a series of attention commands.

Small-sized depopulated helicopter independent flight control system

Abstract: The invention relates to a miniature unmanned helicopter auto flight control system which comprises an on-board control system, wherein, an on-board computer gets signals from sensors through a serial port, and exchanges data with a ground-based computer through on-board and ground wireless Ethernet access points; the on-board computer carries out serial communication with a digital signal processor to control a steering engine set of the unmanned helicopter; a remote control signal receiver outputs to the digital signal processor and then is connected with the on-board computer through a serial port, and an auto control signal and a ground remote control signal are accumulated to get a current steering engine control signal And the auto flight control system also comprises a ground control system, wherein, the ground-based computer transmits flight control instructions to the on-board computer and receives and records flight data; through operating a ground helicopter remote controller, manual control instructions can be transmitted to the on-board remote control signal receiver via wireless radio frequency signals The invention can improve the auto flight ability of the miniature unmanned helicopter, strengthen system reliability, expand the application range of the unmanned helicopter and enable the helicopter to complete given missions beyond the visual range

Design and Realization of Modbus Protocol Based on Embedded Linux System

Abstract: With the rapid development of the embedded computer technology, the new generation of industrial automation data acquisition and monitoring system, which takes the high performance of embedded microprocessor as its core, adapts well to the application system. It meets the strict requests of the function, reliability, cost, size and power consumption, etc. In the industrial automation application system, the Modbus communication protocol is widespread industrial standard and is used in massive industrial equipments, including DCS, PLC, RTU and the intelligent instrument, etc. In order to reach the demand of the embedded data acquisition monitoring system of the industrial automation application, an embedded data acquisition monitoring platform based on Modbus protocol under the Linux environment is designed in this paper. The serial port Modbus master protocol is realized, which includes two kinds of communication mode: ASCII and RTU. As a result, communicating with various serial Modbus salve protocol equipments can be satisfied. The Modbus master realized by this embedded platform is stable and reliable. It has excellent prospect in the embedded data acquisition monitoring system of new automation applications.

Virtual usb communications port

Abstract: A method and system for accessing a remote real communication port (“COM port”) from a server blade in a server blade chassis by creating a virtual COM port in the server blade. A basic input/output system (BIOS) controller monitors an internal COM port in the server blade for communication traffic. Upon detecting the communication traffic, the BIOS controller reroutes the traffic to a virtual USB COM port created by the BIOS controller chipset. The virtual USB COM port directs the communication traffic to an internal universal serial bus (USB) device in the server blade. The USB device then forwards the traffic to an Ethernet media access controller (MAC) input/output (I/O) on a sideband channel to a remote system, which passes the communication traffic to a real COM port in the remote system.

Secure one-way data transfer system using network interface circuitry

Abstract: Network interface circuitry for a secure one-way data transfer from a sender's computer (“Send Node”) to a receiver's computer (“Receive Node”) over a data link, such as an optical fiber or shielded twisted pair copper wire communication cable, comprising send-only network interface circuitry for transmitting data from the Send Node to the data link, and receive-only network interface circuitry for receiving the data from the data link and transmitting the received data to the Receive Node, wherein the send-only network interface circuitry is configured not to receive any data from the data link, and the receive-only network interface circuitry is configured not to send any data to the data link. The network interface circuitry may use various interface means such as PCI interface, USB connection, FireWire connection, or serial port connection for coupling to the Send Node and the Receive Node.

Remote automatic centralized control monitoring meter reading system

Abstract: The invention relates to a long-distance automatic centralized control monitoring meter reading system, which is characterized in that: data collection terminals take an embedding type processor as the core and is provided with an external data memory EEPROM and two extension RS-485 serial port communication modules; the modules are provided with corresponding communication interfaces with one interface used to hang electronic electric energy meters and the other interface connected with a data concentrator; at least two electronic electric energy meters are hung under the data collection terminals; the data concentrator takes an embedding type ARM processor as the core and at the same time, is provided with peripheral equipment including a program memory FLASH and a data memory SDRAM, an extension RS-485 serial port communication module and a long-distance communication module; the RS-485 serial port communication module is connected with the data collection terminals; at least two data collection terminals are hung under the data concentrator; a long-distance management upper computer, based on an ordinary PC and provided with a database server, is communicated with two data concentrators at least through the long-distance communication module.

Heliostat tracing controlling apparatus and its control method

Abstract: The invention discloses a heliostat tracking control device, which comprises a main controller and a closed-loop tracking sensor. The main controller comprises a DSP control circuit, a RTC real-time clock, digital signal input and output units, an analog signal input unit, a signal amplifying circuit, a human-computer interface device, a display device, a watchdog circuit, an asynchronous motor, a line of serial port communication interface which carries out the communication with a monitoring computer, and a line of serial port communication interface which carries out the communication with an azimuth angle and altitude angle encoder. The invention further discloses a heliostat tracking control method, the method adopts the open-loop and the closed-loop combined control, the open-loop roughly calculates and adjusts the position of a heliostat and the closed-loop corrects and eliminates the accumulated error till the precise tracking. The heliostat tracking control device has the advantages that the heliostat tracking control device can not have the accumulated error or the failure of the tracking system due to the rainy and cloudy weather. The system adopts the combined control algorithm within the control period, thus achieving the precise tracking of the heliostat. The tracking reaction speed, the power consumption and the cost are low, thus forming a modular structure.

Multiple transmitter system and method

Abstract: Systems and methods of data transmission are disclosed. In an embodiment, at least two transmitters are selectively activated and at least one transmitter is deactivated at a serial interface to transmit data via at least two distinct lines.

Virtual universal asynchronous receiver transmitter for server systems

Abstract: In one embodiment, a monolithic integrated circuit includes a first UART, a second UART, and a multiplexer. The first UART has a parallel IO interface to couple to a host system to transceive parallel data and a serial IO interface. The second UART has a parallel IO interface and a serial IO interface coupled to the serial IO interface of the first UART. The first and second UARTs convert parallel data into serial data and serial data into parallel data. The multiplexer has an output coupled to the serial input of the first UART, a first input coupled to the serial output of the second UART, a second input coupled to a serial input of a serial communication port, and a select input coupled to a control signal selectively coupling serial interfaces of first and second UARTs together for remote terminal services at a remote computer system over a network.

SDINS/GPS combined guidance system time synchronism and synchronous data extraction method

Abstract: The invention relates to a SDINS/GPS integrated navigation system time synchronization method and synchronous data acquisition method. 1 PPS pulse of a GPS receiver is used as a reference to generate an IMU sampling clock, and the pulse signal outputted from the IMU is counted by a counter in the FPGA, so that IMP data sampling is synchronous with 1 PPS, and the synchronization of IMU data and GPS data is realized. GPS data is received through a serial port for realizing VHDL language. The floating point DSP responds the external interruption of the FPGA, reads the IMU data inside the FPGA, and acquires synchronous IMU data and reads GPS data in accordance with the IMU synchronization marks and GPS reading marks. The invention adopts hardware synchronization and time synchronization, leading to good stability. It can realize re-synchronization with 1 PPS, so as to provide high-precision synchronous data for integrated navigation computation and improve the overall performance of integrated navigation system. The DSP acquires synchronous data with interrupt mode and hardly occupies the DSP resource for computation, leading to good real-time performance.

Serial port initialization in storage system controllers

Abstract: A boot menu is provided for manual setting of serial port parameters. A serial console mode menu allows an operator to set serial port parameter values. After the user selects the serial port parameters, when the controller continues with the boot process, the serial port is initialized with the newly selected parameters. A mechanism is also provided for manual setting of serial port parameters through an administrative management window at the host. In addition, an adaptive baud rate negotiation mechanism using the Universal Asynchronous Receiver Transmitter (UART) registers in the serial port is provided. The adaptive baud rate negotiation is based on the return characters received from a break character from the serial console. The mechanism uses a look-up table for the baud rate versus the bit pattern that is received. The mechanism then sets the baud rate based on the look-up table values.

Programmable duty cycle distortion generation circuit

Abstract: An integrated circuit is provided comprising: a serial transmitter, a serial receiver and a serial connection providing communication between the serial transmitter and the serial receiver. The integrated circuit further comprises a duty cycle distortion circuit so that the integrated circuit can be stress tested by distorting the duty cycle of a signal within the integrated circuit.

Wireless remote monitoring system based on built-in platform

Abstract: The invention provides an embedded platform-based wireless remote supervision system, relating to the wireless remote supervision electricity technical field; the system includes three parts of a ZigBee terminal node-based wireless data collection system, a ZigBee technology-based wireless data transmission system and an embedded ARM platform-based data processing and Ethernet data transmission system. The invention specifically comprises monitored device, a ZigBee terminal node, a ZigBee route node, an ARM platform ZigBee center node coordinator and a monitoring central computer, wherein the embedded ARM platform is provided with Linux; the ARM platform reads data of the ZigBee center node by a serial port, analyzes and processes the data and displays the data on a LCD(touch screen) of the ARM platform; simultaneously, the analyzed and processed data can be transferred to the monitoring central computer through the Ethernet of the ARM platform. The invention has the characteristics of high performance, low power dissipation, low cost, easy networking, easy installation and good compatibility.

Control of serial port (RS-232) communication in LabVIEW

Abstract: The present paper describes control of serial communication in LabVIEW software. Serial communication is a popular means of transmitting data between a computer and a peripheral device such as a programmable instrument or even another computer. Serial communication uses a transmitter to send data, one bit at a time, over a single communication line to a receiver. You can use this method when data transfer rates are low or you must transfer data over long distances. Serial communication is popular because most computers have one or more serial ports, so no extra hardware is needed other than a cable to connect your instrument to the computer (or two computers together).

Synthetic meter system of hybrid vehicle

Abstract: An integrative instrument system of a hybrid electric vehicle includes an instrument controller, a liquid crystal display terminal and a stepping motor instrument plate. The instrument controller includes a central processing module, a CAN information receiving and transmitting module, a serial communication module, a stepping motor drive module, a power voltage adjusting module and an external keystroke inputting module. The CAN information receiving and transmitting module receives the CAN information from a CAN bus interface and is connected to the central processing module, namely the CAN port of an SCM; the serial communication module is connected with the serial port of the SCM and the data receiving serial port of a colorful liquid crystal display terminal; the input end of the stepping motor drive module is connected with the I/O port of the SCM; the output end of the stepping motor drive module is connected with a 16-bus connector; the power voltage adjusting module converts an inputted 12V vehicle DC power into a 5V power to supply power for the power-consuming chips like the SCM, etc. The external keystroke inputting module is connected with one I/O port of the SCM for controlling the output of high-low levels. The integrative instrument system of a hybrid electric vehicle is characterized by multiple functions and low cost.

Minimum delay bound in Bluetooth transmissions with serial port profile

Abstract: Bluetooth is a key technology for wireless short-range communications. A model to characterise the delay of Bluetooth communications is proposed, which employs the serial port profile, which is nowadays massively implemented by commercial Bluetooth-capable devices. In particular, the model defines the inferior limit of the end-to-end data delay, taking into consideration the overhead and segmentation introduced by the protocols involved in the transmission. The performed experiments show that the model accurately fits the delay obtained through the measurements of actual Bluetooth connections.

Icsa distribution transformer monitoring system

Abstract: The present invention relates to ICSA Distribution Transformer Monitoring System consisting of : 32 bit ARM controller based mother board; IEC l O l, IEC-1 04, DNP3, or Modbus protocol support to communicate with master; Digital outputs with Relays (Potential free contacts) in SBO (Select before Operate) configuration; Digital inputs (optical isolated), Expandable in nature; Serial ports (RS232/RS485) to communicate with master and configuration tool; Master com' port uses RTS signal with preamble & post amble; RTS watch dog for master station communications; High accuracy on-board RTC (Real Time Clock); Master communication port baud rates configurable with jumper settings; LED indications to display Relays and Digital inputs status which LED indication may be visible from see through window on front door; The front door of DTMS having locking system; Low battery message is provided in case of battery get drained beyond 1 1V; Low battery cutoff is provided in case of battery get drained beyond 105V; 32K NV RAM for parameter and events storage Expandable in nature; Front-end software; Connectors for CT's; Onboard Temperature sensor to monitor temperature in DTMS box

Water environment monitoring node based on ZigBee wireless technique

Abstract: The invention relates to a water environment monitoring node based on ZigBee wireless technique. The prior technology has long monitoring period and large work intensity, and cannot reflect dynamic variation of water environment. The invention includes an electric power management module, a water quality parameter acquisition module, an MPU module and a ZigBee radio frequency module. The equipment adopts an MSP430F149 MPU, for analyzing and processing water environmental parameter, and controls the operating status of the ZigBee radio frequency module and the water quality parameter acquisition module. The MSP430F149 processor is interconnected to the water quality parameter acquisition module through a 12 bit A /D converter self integrated with the MSP430F149 processor, and is interconnected to the ZigBee radio frequency module through an SPI serial interface, meanwhile also controls a power supply management module to supply power through an analogue switch, so as to achieve the goal of energy-saving. The invention has low cost, and low power consumption; can be arranged in water environment for a long term, execute multiple parameter real time monitoring to the water environment, and complete the high-efficiency transmission of data, thereby having wide applications prospect in the water environment monitoring.

Distributed observe and control device as well as parking position control method for automatic guidance vehicle

Abstract: The invention discloses a distributed monitoring device based on multiple monitoring units for automatic guided vehicles and a control method for parking location The device is based on RS232 communication wires and digital I/O channels, and has a distributed structure using an industrial computer as a control center and a plurality of monitoring units in independence arrangement The industrial computer is arranged with a serial port expansion card through which the industrial computer is communicated with a drive controller, a steering controller, an obstacle avoidance/weighing controller, a wireless controller, an RFID controller and an operation control, wherein each controller works independently based on a SCM in charge of the relevant monitoring duty Identification signs and electronic labels are arranged on the ground to realize the accurate parking location in combination with the RFID and the image recognition techniques The invention has the advantages of definite function, high reliability and stability and good expandability, and can meet the real-time and safety requirements for running vehicles

Read and write interface communications protocol for digital-to-analog signal converter with non-volatile memory

Abstract: A mixed signal integrated circuit device, e.g., digital-to-analog converter (DAC), has a serial interface communication protocol that accesses volatile and/or non-volatile memory and allows a preprogrammed output voltage whenever the mixed signal device is powered- up. However, unlike conventional DACs, DACs with non- volatile memory may need special interface communication protocols for effective operation of the DAC and communications between a system master controller unit (MCU). Interface communications protocols that do not violate standard serial bus communications protocols are provided for communicating between the volatile and non- volatile memories of the DAC so that the MCU may access the DACs memories (non-volatile and/or volatile memories). The mixed signal integrated circuit device has a user programmable address.

System and method for television set on-line burn recording MAC address

Abstract: The invention discloses a television on-line burning MAC address system and method. The system includes a hardware system and a software system, wherein, the hardware system includes a scan gun, a microcomputer system connected to the scan gun, a television to be written connected with the microcomputer system. The television to be written is provided with a network card. The software system includes microcomputer controlled burning software and television storage setting software. When the television is in place, the RS232 serial port cable of the microcomputer system is plugged into a serial interface of the television, the microcomputer controlled burning software and the television storage setting software are executed to realize burning of the Ethernet network MAC address, thus conveniently realizing television on-line burning MAC address.

Portable vibration data collector and method based on embedded technology

Abstract: The invention relates to the data acquisition and equipment fault diagnosis field, in particular to a portable vibration data acquisition device and a method based on embedded technology The device comprises an acceleration transducer, an acceleration transducer interface module, a capacitance isolation module, a programmed control amplifying module, a self-adapting antialiasing filter, an AD converter and the bus interface of the converter which are connected in turn; moreover, the device also comprises an ARM minimum system, a DIM144 interface module, a singlechip as well as an electronic label module, a keyboard, a power source management and voltage conversion module which are connected with the singlechip; in addition, the programmed control amplifying module and the self-adapting antialiasing filter are also connected with a singlechip 8 The device communicates with an upper computer through a serial port to assign point inspection task, and transmits the sampling frequency in the point inspection task to the singlechip; moreover, the singlechip sets the lowpass cut-off frequency of the antialiasing filter according to the sampling frequency With low power consumption, convenient operation and powerful data analysis function, the device has the characteristics of real time and accuracy

Uart/usb converting apparatus

Abstract: A UART/USB converting apparatus includes a UART connector, a UART/USB converting chip and a USB connector. The UART connector is for transceiving a UART signal ranging from 0 to 3.3 volts. The UART/USB converting chip electrically connected to the UART connector is for converting between the UART signal and a USB signal. The USB connector electrically connected to the UART/USB converting chip is for transmitting the USB signal.

A synchronous detection and failure separation method for dual control high-availability system

Abstract: The invention provides a method of synchronous detection and failure isolation for a double control highly available system. The system is provided with two controllers which use special channels integrated on a PCI mainboard, serial ports or network card cables to monitor the HADaemon process of the counterpart. When a failure appears, a primary controller and a secondary controller conduct the following control steps of: 1), the primary controller releases virtual IPs of a server and the secondary controller takes over the IPs through ARP deception; 2), the resources of the main controller are hung and send state information to the primary controller, and a related service is started to realize seamless switching; 3), during the taking over of IP and the switching of servers, an alarm is given in an email log; 4), the primary controller after restoration choose takeover service or no takeover as a backup of synchronous detection; 5), in order to improve the availability of heartbeat transmission, network cards and serial ports are used together to avoid single point failure of a link; 6), a failure occuring in a network for external services of the primary controller can also be detected by the HADaemon which then triggers the primary controller to take over the virtual IP and switch the resources.

Nickel-hydrogen battery management system for electric vehicle

Abstract: The invention relates to a Nickel-metal hydride battery management system for electric vehicles, comprising a system mainframe connected with a pressure and temperature detection module, a fan controlling module and a capacity detection instrument. The system mainframe is a single chip microcomputer and is connected with a serial interface 1, a serial interface 2, a data memory, a clock, a RS232 serial interface and a digital quantity interface. The capacity detection instrument is connected with the single chip microcomputer after being connected in series with a battery current divider, a current divider voltage signals adjustment and a voltage frequency conversion. The single chip microcomputer comprises a serial interface communicating with an AGV controlling computer and a display unit. The battery pressure and the temperature detection module are connected with the single chip microcomputer after being connected in series with five-bath battery voltage signals adjustments, an analog signal multiplexer, an A/D module number conversion interface. The single chip microcomputer comprises a five-bath temperature sensor, a photoelectric isolation serial interface and the fan controlling module. The system reduces weight, improves energy utilization rate and ensures favorable working conditions for the battery.

Embedded Linux system firmware downloading method and device

Abstract: The invention discloses a device and a method for downloading firmware of an embedded Linux system. According to the principle of downloading from the simple to the complex, the most fundamental and simplest part is downloaded through a serial port, then the more complex part is downloaded, and finally, a user application program is downloaded. By adopting the device and the method provided by the invention, the firmware downloading for the embedded Linux system can be completed by a PC, thus a Flash memory is programmed through serial port and a high-speed serial interface, and the disposition of the whole system is completed. Compared with prior art, the invention has the advantages of high downloading speed, simple operation, low cost, and suitability for both R&D stage and mass production stage.

Design and Development of a Flexible Multi-Purpose Controller Hardware System for Power Electronics and Other Industrial Applications

Abstract: This paper proposes the concept of a universal controller hardware system for power electronics applications. With the presence of generic interfaces and communication schemes, this system can be used in various other control scenarios. A prototype hardware system incorporating a high performance floating point digital signal processor (DSP) and a powerful field programmable gate array (FPGA) has been built to demonstrate the concept of real-time hardware simulation. Prior to being deployed for control of a complete power electronics system, an intermediate step that would yield more information pertaining to system timing is the hardware simulation enabled by such a board. Extracting maximum throughput from this system with a few innovative schemes has been another goal of this project. In order to achieve this objective, the embedded peripherals of the Texas Instruments C6000 series DSP have been programmed to facilitate a higher degree of parallelism. The core of this paper deals with the different sub-systems that comprise the real-time controller (RTC) board, and their interaction with one another. One of the novel schemes proposed in this paper involves the on-board communication between the DSP and several analog-to-digital converter (ADC) chips using the multi-channel audio serial port (McASP) peripheral. The efficacy of this concept is made possible by a robust software architecture, enabled by the enhanced direct memory access (EDMA) peripheral. In addition to the DSP peripheral activity, significant processing capability is offered by the Cyclone II series FPGA. The option of universal connectivity is provided over either Ethernet or USB. The FPGA also provides a platform for developing a complete system with an embedded 32-bit processor. The RTC board prototype can be used for power electronics applications with the addition of certain interface boards, which can be readily developed.

Device for monitoring stray current of novel subway

Abstract: Novel subway stray current automatic monitoring system comprises that a plurality of stray current online automatic monitoring devices which are utilized as local monitoring slave machines are connected with a remote monitoring main machine. A switch power module, a data collecting module, an Ethernet communication module, an auxiliary hardware module and a man-machine interactive module are arranged on the same PCB printing circuit board around the processor of the system. The switch power module is internally-equipped with an EMC filter with high-performance. A/D transformation circuit employs bipolar and 12 bit A/D transducer MAX197 which is internally equipped with 8 ways sample-taking passages. The auxiliary hardware module comprises an EEPROM secondary permanent storage module, a hardware watchdog circuit, a self-contained battery calendar clock module and a serial port communication interface circuit. The invention simplifies the structure of the system, enables data sharing, information fusion and synergic observation among slave machines, which greatly strengthens the accuracy and tightness of the monitoring of the stray current, additionally, the cost of the monitoring device is reduced.

Method for arousing and stream control of mobile terminal processor serial port

Abstract: The invention discloses a method for arousing a mobile terminal processor serial port and flow control, comprising following steps: a first processor sets a pin at the output state, changes the electric level hight of the connecting wire between the first processor and the second processor; the second processor receives the electric level change of the connecting wire, generates an intermit, changes the electric level triggering type; the first processor sets the pin at the input state, the connecting wire is returned to the primary electric level to form a pulse; the second processor generates an intermit, closes the intermit for controlling the pin, exits the dormancy state, looks up the receiving buffer has whether or not space and the serial port whether or not can be used; if the receiving buffer has spce and the serial port can be used, the pin is set at the output state, the electric level of the connecting wire is changed; the first processor responses the electric level changes, closes the intermit for controlling the pin, sends data through the data line connected with the processor, uses two controlling wires in the serial port communication, realzies serial port bidirectional arouse, bidirectional arouse affirmation, bidirectional flow control and dead halt monitoring.