meet the requirements of data transmission in Multi-Point media, the transmitter signal is not too weak, and the signal transmission requirements are not met in signal attenuation; or
Excessive signals lead to Circuit overload and generate harmonic and other false signals. Therefore, for systems with N sites, to meet the preceding requirements, consider
N * (n-1)/Two arrays.
(4) Two transmission technologies: baseband transmission (full-frequency transmission of two-way digital signal transmiss
. Powerpctm structure processor consists of three modules: powerpctm kernel, System Interface Unit (SIU), and communication processor module (CPM ). All three modules adopt a 32-bit internal bus. The master processor of the MPC860 is a 32-bit powerpctm kernel that enables memory management (MMU) and command and data caching. In the system interface unit of the MPC860, the memory control unit supports a variety of high-performance memory, including SDRAM and flash, as well as a PCMCIA controller
Measure the node spacing of wireless sensors using audio signals
[Date:]
Source: China Power Grid Author: Meng lingjun, Xia shanhong
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1 Introduction
A wireless sensor network node system that uses audio signals to achieve autonomous measurement of node spacing. The system includes dsPIC6014A microcontroller, 512 kb sram, 2.4G band RF transceiver module, audio transce
I. router interface
A vro has powerful network connection and routing functions. It can be physically connected to a variety of different networks, which makes the router interface technology very complex, the more upscale a router has more interface types, because the more network types it can connect. Vro ports include LAN ports, WAN ports, and configuration ports.1. LAN interface
Common Ethernet interfaces include AUI, BNC and RJ-45 interfaces, as well as FDDI, ATM, Gigabit Ethernet and so on
0. Relevant informationRelated materials include other highlights and code warehouse "embedded TCP IP data Rollup" "ENC28J60 Learning Notes-Index" "Part 1th" "Part 2nd" "Part 3rd" "Part 4" "Stm32net Learning Notes-index" UI P Learning Notes "LWIP learning notes--stm32 enc28j60 transplant and Getting Started"
1 Preface
Embedded Ethernet development can be divided into two parts, one is the use of Ethernet transceiver chip, one is the implementatio
fiber, mobile satellite systems and 3G.A practical broadband wireless access technologyDigital microwaveMicrowave technology is the first technology used in wireless access network. The first generation of wireless access technology in the the 1970s is microwave technology. Today, the microwave technology to digital, high frequency, broadband direction, very suitable for broadband access, a bit of the structure, but also a bit of the multiple point structure. Point-to-Point bandwidth is the hig
transmission, using a pair of twisted pair.C, RS-422 need a terminal resistor, the resistance is about equal to the characteristic impedance of the transmission cable.(8) RS-485 Serial Bus interfaceA, RS-485 is established on the basis of RS-422 standards, increased multi-point, two-way communication capacity, communication distance of dozens of meters to thousands of meters.B, RS-485 transceiver with balanced transmission and differential reception,
packet from the ge-2/3/0 port; the RT2 ge-1/1/11 port transceiver counter unchanged, indicating that the RT4 ping package does not reach RT2.
RT4:
Interface ge-2/3/0
Input packets: 25
Output packets: 8246
RT2:
Disp int gi 1/1/11
Input: 0 bytes, 0 packets
Output: 1536 bytes, 24 packets
Case 2: Only one Pigtails are required to be connected, that is, RT4 sends the pigtails in the RT2 receiving direction; RT2 ge-1/1/11 port up, RT4 ge-2/3/0 port down,
, in fact, the two kinds of RJ-45 port is completely the same as the port itself, however, the network circuit structure corresponding to the port is different, so it cannot be connected at will.2. the AUI port is the LAN interface used to connect to the coarse coaxial cable. It is a D-type 15-pin LAN interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10Base-5 network through the coarse coaxial cable tra
content of the LED display can be easily updated in real time in any place with mobile network coverage by means of short messages, effectively solving the trouble of updating the LED display data and the difficulty of monitoring, reduces the workload of management departments. With the development of mobile communication technology and the further promotion of the application scope of LED display screen, this kind of LED display screen based on mobile data has great application value.1. system
There are many ways of communication between single-chip microcomputer and PC. The following program mainly uses the asynchronous serial communication of 51 single-chip microcomputer.I. 51 Serial Communication pins of Single-chip Microcomputer
P3.1 is the txd pin (Transfer Data) of the microcontroller, and p3.2 is the rxd pin (receive data) of the microcontroller ).
The txd pin can be used to output data from the CPU. The rxd pin can read data from the serial data line.
Ii. 51 MCU serial communi
Instruments for the OMAPH2 software development platform running an Linux 2.6 kernel. ThatBuilds on the standard Linux USB host and peripheral side driverFrameworks, making small additions as described here. It also includesDrivers implementing OTG support on OMAP platforms.OMAP H2 Platform
The H2 software development platform between des a Texas InstrumentsOMAP 5912/16 XX Series processor, with an arm 926tej CPU, a DSP, batteryPower Management, and a wealth of other features often used in cell
skin, turns, "cat5" on the skin, 5 categories on the box, 305 meters/box, 100-500 RMB/box (meters per segment, connected with 4 relay devices, up to meters)
Wiring sequence: Normal: White orange white green blue white blue green white Brown1 2 3 4 5 6 7 8Consortium: white green white orange brown white brown orange white blue1 2 3 4 5 6 7 8STP: similar to UTP, external aluminum foil, apple, and IBM network products require STP twisted pair wires for high speed and high price.(2) coaxial cable:
structure of the Bluetooth system. In a Bluetooth system, the network connected to a device is called the pico network (piconet), which is composed of a master node (masterunit) andComposed of multiple slave nodes (slaveunit. The master node is the bluetooth device used to synchronize other nodes in the micro-network. It is the initiator of the connection process and can maintain connections with up to seven slave nodes at the same time. Slave node is microDevices except the master node in the
standards. They are plug-and-play and support full duplex mode.
3. POF-RJ45 Optical Transceiver
POF-RJ45 optical transceiver is an Ethernet optical interface to RJ45 converter. It provides a POF fiber port and a twisted pair port with an RJ45 connection interface. It converts electrical signals from an Ethernet network to optical signals transmitted on a POF plastic optical fiber, and vice versa. The POF-R
The mt6165 is a TD-SCDMA and 2g dual-mode RF transceiver implemented in 40nm CMOS. The intrusion network RF transceiver functions are fully integrated. This document describes the performance objectives of RF. Embed macros throughout your productKey Features-Low cost Dual Mode RF Solutions (GGE and TD-SCDMA). 8 (hspa+)) four-frequency GGE (GSM850/900/DCS/PCS)/three-band TDD (B34/B39/B40) support 16QAM UL/64
cycle from the standard 12 system cycles, and the peak performance will reach 25 MIPS. In addition, the CAN controller and high-speed A/D converter can be integrated in the to simplify the system design. The CAN controller is integrated with the. To run the CAN bus, the can transceiver must be connected to the single-chip microcomputer to perform electrical conversion and convert the logic signal into a balanced Differential Code. Commonly used can
Microprocessor AT91RM9200 with ARM920T as the core. It features a clock speed of up to 180 MHz and advanced power-saving technology. It integrates interfaces such as SDRAM, Flash, infrared, and USB. The system uses USB (Universal Serial Bus) and infrared mode to communicate with the host computer. The infrared method is realized by HSDL-3602 infrared transceiver of Agilent.1.2 Radio Frequency Identification ModuleThe RFID module uses the Swedish TagM
equipment racks is pigtails. Pigtails have a diameter of about 4mm, and both ends are equipped with standard connectors.The interface connecting optical fiber or optical fiber is called optical port, and the interface connecting the optical fiber is called electrical port.Optical Transceiver: generally composed of optical receivers, optical transmitters, and electrical terminals. There are also internal alarm modules (when the device is faulty) and o
is sent to the host computer every 20 ms.
Wireless Data Transmission System
The lower computer transmits a set of Optical Encoder values (speed), battery, angle, and current sensor STATUS (sensor) to the upper computer every 20 ms) in the ideal state, the host computer should receive the cyclical data of the above values, in this case, the upper computer only needs to load the data in order into their respective arrays and draw a picture. However, data may be lost during wireless transmissi
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