1、傳送和接收訊號陣列結構：
0xaa55(cmd)(data1, data2,……,data32)(check1)(check2)；
2、cmd、data、check範圍：01-ff
3、所有資料加起來的和得到的高位為(check1)，低位為(check2)，然後收到資料方再累加一次與(check1)(check2)進行比較，可以有效防止資料出錯，出錯概率為1/256*1/256。
怎麼把累加得到的三位元組或者四位元組的16進製制數拆成兩半分別放置呢，用乙個&就可以完美實現了。
data37 =(data36 & 0xff00) >> 8, data38 = (data36 & 0xff);cbytearray receivedata;
int receivedatalen;
receivedatalen = str2hex(buffer, receivedata);
int data36 = receivedata[0] + receivedata[1] + receivedata[2] + receivedata[3] + receivedata[4] + receivedata[5] + receivedata[6] + receivedata[7] + receivedata[8] + receivedata[9]
+ receivedata[10] + receivedata[11] + receivedata[12] + receivedata[13] + receivedata[14] + receivedata[15] + receivedata[16] + receivedata[17] + receivedata[18] + receivedata[19]
+ receivedata[20] + receivedata[21] + receivedata[22] + receivedata[23] + receivedata[24] + receivedata[25] + receivedata[26] + receivedata[27] + receivedata[28] + receivedata[29]
+ receivedata[30] + receivedata[31] + receivedata[32] + receivedata[33] + receivedata[34],
data37 = (data36 & 0xff00) >> 8, data38 = (data36 & 0xff);
if ((receivedata[35] == data37) && (receivedata[36] == data38))
}
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