找到问题了,硬件与接线没疑问,是输出电码没有 checksum ,数字钟不接受。
两个装置的电码输出如下:
1. From WiFi-GPS Module
$GPRMC,030357.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030357.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030358.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030358.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030359.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030359.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030400.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030400.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030401.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030401.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030402.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030402.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*
$GPRMC,030403.00,A,2459.83256,N,12132.55650,E,0.132,,040516,,,*
$GPGGA,030403.00,2459.83256,N,12132.55650,E,1,08,1.01,23.1,M,17.1,M,,*

2. From GPS Receiver
$GPRMC,030622.00,A,2459.83689,N,12132.56208,E,0.059,,040516,,,A*73
$GPGGA,030622.00,2459.83689,N,12132.56208,E,1,07,1.38,23.7,M,17.1,M,,*69
$GPRMC,030623.00,A,2459.83689,N,12132.56207,E,0.059,,040516,,,A*7D
$GPGGA,030623.00,2459.83689,N,12132.56207,E,1,06,1.38,23.5,M,17.1,M,,*64
$GPRMC,030624.00,A,2459.83687,N,12132.56206,E,0.058,,040516,,,A*74
$GPGGA,030624.00,2459.83687,N,12132.56206,E,1,06,1.38,23.3,M,17.1,M,,*6A
$GPRMC,030625.00,A,2459.83685,N,12132.56205,E,0.058,,040516,,,A*74
$GPGGA,030625.00,2459.83685,N,12132.56205,E,1,06,1.38,23.1,M,17.1,M,,*68
$GPRMC,030626.00,A,2459.83686,N,12132.56203,E,0.057,,040516,,,A*7D
$GPGGA,030626.00,2459.83686,N,12132.56203,E,1,06,1.38,22.8,M,17.1,M,,*66
$GPRMC,030627.00,A,2459.83688,N,12132.56201,E,0.057,,040516,,,A*70
$GPGGA,030627.00,2459.83688,N,12132.56201,E,1,08,1.38,22.5,M,17.1,M,,*68
$GPRMC,030628.00,A,2459.83689,N,12132.56200,E,0.056,,040516,,,A*7E
$GPGGA,030628.00,2459.83689,N,12132.56200,E,1,08,1.38,22.3,M,17.1,M,,*61
可以看出此模块 RMC 与 GGA 都没有输出最后面的检验码,我的数字钟为了长距离传输使用了 RS-422 介面并检查了 checksum 后才能接受。
同时贴上实物照片以供参考。
右边蓝色是多格式转换介面,可以 USB, 232, 422, TTL 任意转换。
七位数的数字钟含 1/10 秒,可以接受广播标准时间码(SMPTE)或 GPS NMEA 码。
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