收到的報文如下, 通訊方式是 9600 N 8 2 .一直搞不明白是昨個校驗的.高手不要飄過
C0 00 40 20 00 00 7F 22 10 6D
80 00 00 00 69 00 09 00 0C 6C  
C1 00 00 00 69 00 09 00 0C 2D  
C4 00 02 00 69 00 09 00 00 26
84 00 00 00 00 3C 30 3D 02 37
C5 00 00 00 00 3C 30 3D 02 76
85 00 00 00 00 7F 4F 64 04 55
C6 01 00 00 00 7F 4F 64 04 17  
86 00 00 00 00 00 7F 64 06 1B
C7 00 00 00 00 00 7F 64 46 1A
87 00 00 00 00 7F 7F 22 02 27
C8 00 00 00 00 7F 7F 22 02 68  
C0 00 40 20 00 00 7F 22 10 6D
80 00 00 00 69 00 09 00 0C 6C


C0 00 40 60 00 00 7F 22 10 2D  
80 00 00 00 69 00 09 00 0C 6C
C1 00 00 00 69 00 09 00 0C 2D  
C4 00 02 00 69 00 09 00 00 26
84 00 00 00 00 3C 30 3D 02 37
C5 00 00 00 00 3C 30 3D 02 76  
85 00 00 00 00 7F 4F 64 04 55
C6 03 00 00 00 7F 4F 64 04 15
86 00 00 00 00 00 7F 64 06 1B
C7 00 00 00 00 00 7F 64 46 1A
87 00 00 00 00 7F 7F 22 02 27
C8 00 00 00 00 7F 7F 22 02 68  

走過路過,千萬不要錯過.

發送的是 C開頭的  其它是返回數據

MODBUS協議定義了4種基本數據類型：可讀寫位數據，只讀位數據，只讀16位數據，可讀寫16位數據。這些數據分別被稱為線圈狀態，輸入狀態，輸入寄存器，保持寄存器

分析一下結果如何?

C4 00 02 00 69 00 09 00 00 26
C4 01 00 00 69 00 09 00 00 25 //主泵燈
C4 03 02 00 69 00 09 00 00 25  //呼叫燈
C4 01 22 00 69 00 09 00 00 07 //流流燈
C4 41 02 00 69 00 09 00 00 67 //加熱 主泵 卸壓燈
C4 01 42 00 69 00 09 00 00 67//主泵 卸壓 放水
C4 01 02 00 69 08 09 00 40 6F //冷卻主泵卸壓 燈

有二個數據沒有變C4  69 前面三個數據 69后面三個數據 及后面二組數據會變化

最后的貌似是 校驗

期待高手出現