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1756-DHRIO Allen Bradley
1756-DHRIO Allen Bradley
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上架日期:2021-10-20 15:32:51
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    1756-DHRIO Allen Bradley 

     GPS授时系统的软件设计

    系统软件主要分为初始化、GPS数据接收存储、数据传送子程序3部分。软件流程如图4所示。

    首先将GPS OEM接收板通过串口与PC连接好,接通主电源和备用电源,用自带的接收软件SNSRCFG设置初始化信息,只输出一条GPRMC语句,保证每秒接收存储时间信息的精度;然后转化为NMEA格式,连接上传,则初始化信息就自动将被保存在板内的永久性存储器中,下次上电时将会自动生效。如需更改则要再次修改参数和再次上传。

    系统上电后硬件复位,设置UART的波特率为19200b/s,数据通信格式为10位异步收发;授时接收系统进入正常工作状态,单片机(AT89S51) 通过RS-232串行方式接收GPS OEM板的卫星数据。通过查询字头,接收OEM板GPRMC输出语句中的时、分、秒和年、月、日信息。没有用的信息跳过。由于接收到的是UTC时间.出于习惯考虑,将UTC时间转化为北京时间。

    本地时间=GPS时间+时区值

    北京位于第8时区,时区值为+8。将接收到的时间信息转化为北京时间,按日、月、年、时、分、秒的顺序存储在片内30H到3BH这12个单元中。然后用 MOVX指令将数据送到片外双口RAM的0C00H到0COBH中,供另外需要时间信息的CPU调用。图5为某次仿真结果,时间是北京时间2005年4月 15日9时lO分8秒。


    1756-DHRIO Allen Bradley 
    TEXAS INSTRUMENTS 2222880-0001 PWB APPL CONT II 880/885

    TEXAS INSTRUMENTS 2222611-0001 PRINTER CONTROLLER

    ComFuture DISPLAY CONTROLLER REV A.3

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    5 X 108847252 DC-DC CONVERTER SMD MODULE 5VT0

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    NEW NetApp 112-02115 REV A1 40/03 AMPHENOL Cable

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    Turbine Engine blade 5001710-02 Y EM2 P For collectors

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    Enlarge
    Alvarion Anntena 7330175 2.5Ghz 10Mhz Band A

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    CYONICS LASER Power Supply 2101-10SLSX 115V 17AMPS

    Motorola STLF4014BB BBX 2 800MHZ 379GYQ53ES

    TECHNE FMCS-104S Biological Stirer

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    DIGITAL H8673-AC 20MA DB25 TO EIA-423 MMJ CONV

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    ZEAG PARKING SLG 97 V2.3 MOTOR 703.0530

    MPL M800-B-SBC FROM ZEAG PARKING SYSTEM

    TANDBERG TT5020 MPEG-2 TRANSPORT STREAM PROCCESSOR

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    Abx/VEGA MS1532 CBD110CD-A PULSES PROCESSING BOARD

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    PCT PCT-TRS-59 International 50 Compression Connecte

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    lot of 3 x CISCO 800-01234-04 PRI-1CE1B MODULE

    CISCO MODEMS 8AM 800-02482-02 73-3283-02 MODULE

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    LOT OF 2 STRATOS MGBC-20-4-2M-S ABFHE085

    4610SW Avaya 4610SW IP Phone 4610SW

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    METTLER STEPPER MOTOR SM40-2403DD

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    lot of 40 x CISCO WIC-1B-S/T ISDN BRI S/T 800-01833 

    ADC GTI-DSX-DR19-RX GUNS PROJECT GLOBAL TECH. -48V

    1756-DHRIO Allen Bradley

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