port data unit 中文意思是什麼
port data unit
解釋
埠數據單位-
A stand alone disk drive that reads and writes data on rigid disks and can is attached to a port on the system unit
一種讀、寫硬磁盤上數據的獨立的磁盤機，可以連接在系統設備埠上。 -
A stand - alone disk drive that reads and writes data on rigid disks and can be attached to a port on the system unit
一種讀、寫硬磁盤上數據的獨立的磁盤機，可以連接在系統設備埠上。 -
Socket function mainly realizes setting up and initializing service unit socket, initializing service unit and service unit serial and so on. bind funcion primarily binds local address and port for the socket. listen function is to evaluate the max length of server ’ s listening queue. connect function and accept function set aside rate ahead, infrom user ’ s request of establishing virtual circuit to suna, cooperate with suna to establish the connection between client and server, return the result. we make use of three handshake with data protocol and virtual circuit mode, in this way, when we translate data, we can look up communication course according to virtual circuit number, at the same time, there aren ’ t source ip address and port, end ip address and port in the head of data package, the speed of translating data advances in a certain extent. send function and recv function is to send data collaborating with suna, and copy data from the receiving queue of socket to user ’ s buffer. close function cooperate
Socket （ ）函數實現創建、初始化服務元套接字，初始化服務元及服務元序列等。 bind （ ）函數為套接字綁定本地地址和埠號。 connect （ ）和accept （ ）函數主要是根據用戶要求預留帶寬，將用戶的建立虛電路請求轉達給服務元網路體系，協作服務元網路體系採用捎帶數據的三次握手協議建立虛電路，並告訴用戶處理結果，一方面，捎帶數據的三次握手協議在一定程度上可提高數據傳輸速度;另一方面，採用虛電路方式，使得數據通信可直接根據虛電路號查找相應的通信進程，而且數據包的包頭中省去了源ip地址、埠號和目的ip地址、埠號，提高了數據傳輸速率。 -
According to the test conditions, the double polarity inputting mode is adopted in the circuit of voltage - frequency converting part ; storage batteries are used in the optical emission part of optical fibre isolating and transmitting device, that can guarantee isolation between the main circuit and the testing system ; the 89c51 singlechip is used in the singlechip testing - controlling unit, the peripheral circuits are extended, data are transmitted through the serial port in this part ; the p opular software delphi5. 0 is used in the pc part, the communication between singlechip and pc by serial port, plotting of current wave, regulation of data ; the optical - electrical isolating and triggering are used in the controlling part, this can guarantee the veracity and reliability of breakers triggered, this triggering mode is also used in the triggering of the main closing breaker, the tested breaker and the assistant breaker, the triggering signals are sent out by a singlechip
壓頻轉換部分電路中根據實際情況採用了雙極性輸入方式；光纖隔離傳輸裝置的光發射部分電源採用了蓄電池供電，確保了主迴路與測試迴路的完全隔離；單片機測控部分採用了89c51單片機，擴充了外圍電路，通過串口向pc機傳送數據； pc機與單片機之間的串口通訊、波形繪制、數據管理等都採用了軟體delphi5 . 0編寫。該測試系統中預留了輸出口，可以對合成迴路中的主合閘開關、被試開關、輔助開關進行觸發，信號由單片機發出，控制部分採用了光電耦合隔離觸發的方法。軟體設計主要集中在對電流信號的數據採集、數據處理、數據傳送、人機界面、波形繪制和數據管理，軟體部分又可分為單片機和pc機程序設計兩大部分。 -
For the teaching the hardware pwm inverter is designed, including the choice of power module, filter tache, auxiliary power supply, brake unit and protection circuits. in addition data sampling system is contrived with encoder and current / voltage sensors. the control circuit with tms320f240 for the core is presented at last. the circuit includes memory extension, d / a converter digital i / o interface and the interface of the serial port. the way of space vector pwm realization is briefly introduced in this paper
接著，設計了pwm電壓型逆變器，其中包括主迴路功率模塊與濾波環節、控制電源、制動單元及保護電路設計。另外還利用霍爾元件與編碼器設計出數據採集系統。最後，給出了基於tms320f240的最小系統，包括存儲器擴展、串口擴展、數字i o介面以及空間矢量pwm的實現。 -
In this thesis, firstly, the main protocols and their functions, the application profiles of bluetooth technology are introduced. the hci protocol is analysized emphasesly ; secondly, the 4 - channel 10v analog to digital conversion ( a / d ) bluetooth adapter, 4 - channel 10v digital to analog conversion ( d / a ) bluetooth adapter, rs232 serial port bluetooth adapter are developed. the hardware and software of them are realized and test ; thirdly, the test tool software for bluetooth adapter is designed. the displaying and saving of data with vc + + 6. 0 multithread in pc is completed, then the wireless serial port communication between pc and micro - controller unit ( mcu ) is implemented, the data results of those adapters are acceeded ; finally, the bit - error - rate testing software of bluetooth communication system is designed, and the bit - error - rate test results of bluetooth adapter in labortary are acquired and illustrated also
其次提出了硬體設計方案:四通道10v模擬/數字（ a / d ）藍牙適配器、四通道10v數字/模擬（ d / a ）藍牙適配器， rs232串口通信藍牙適配器。在此基礎上完成了硬體電路和軟體程序的設計和調試。再次，設計了藍牙適配器測試工具軟體，在pc機上用vc6 . 0 + +多線程編程完成對傳輸數據的保存與顯示，實現了pc機與單片機的串口無線通信，並給出了藍牙適配器測試結果。
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