从中找出数据的头，然后读取数据
if (readeddatabuffer.count >= 20) { int removecount = 0; for (int i = 0; i < readeddatabuffer.count - 18; ++i) { // 14 7b节点 if (readeddatabuffer[i] == 0xfd & readeddatabuffer[i + 4] == 0x28 & readeddatabuffer[i + 5] == 0x7b) { byte[] data = new byte[20]; /*节点*/ int data31, data32; double v3, t3; data31 = readeddatabuffer[i + 12];//高八位 data32 = readeddatabuffer[i + 13];//低八位 v3 = (data31 * 256 + data32);//电压值 t3 = -39.66 + 0.01 * v3 + 0.026; tcure = t3; wendu = t3.tostring(); } removecount++; } }