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一路向前hg
相互學(xué)習，共同進(jìn)步！
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樓主  發(fā)表于: 2020-08-14 16:24
想請教各位大師，這個(gè)CRC校驗碼到底有啥用，是如何計算
我用串口調試助手發(fā)送 讀取MODBUS溫控器溫度
00 03 0000 0004
沒(méi)有填寫(xiě)校驗碼，助手上校驗碼哪里就自動(dòng)得出5C44
發(fā)送完后溫控器返回：
04 03 08 00DB 00DD 00CF 00D2 B3 67
B367事校驗碼
那么問(wèn)題是：
1助手上5C44是怎么出來(lái)的
2溫控器返回B367是怎么算的
3為什么我不發(fā)送效驗碼溫控器也能返回數值
斗志不能低
txarcher
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1樓  發(fā)表于: 2020-08-15 10:48
CRC校驗碼在網(wǎng)上是有計算公式的，不過(guò)現在一般的指令都自帶了，所以很少去記了，校驗碼是按找你發(fā)送的數據進(jìn)行計算的, 如你發(fā)送6個(gè)數據，CRC就會(huì )根據你這個(gè)6個(gè)數據來(lái)計算，返回的數據是，返回8個(gè)數據，最后兩位是CRC校驗碼，根據前面的6個(gè)數據來(lái)計算得出

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