WATTECO BoB Assistant, Справочное руководство

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Bob Assistant - Reference Manual
2023-04-04 - Version 1.0 29
3.2.2. Learning message payload data extraction example
Learning payload:
0x6c00001f3f013601407f5b4467393c303176301c332b61345b7e303e2318373f333f2231444a4245
byte 0 1 2 3 4 5 6 7
6c 00 00 1f 3f 01 36 01
byte 8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 31
40 7f 5b 44 67 39 3c 30 31 76 30 1c 33 2b 61 34 5b 7e 30 3e 23 18 37 3f 33 3f 22 31 44 4a 42 45
Byte Definition hex dec Value Unit Comments
0
Header
6c 108 Sensor type=10 8=ASCII “ l ”
=>learning for KX version
- Learning header ID for KX version
1
Learning percentage
00 0 0% % Learning percentage = 0%
➔
the
device just started a learning session
2 Maximum Vibration
amplitude (3 bytes)
Vibration level 1
(vl_1)
Vibration level 2
(vl_2)
Vibration level 3
(vl_3) 00 0 vl=(vl_1*128+vl_2+vl_3/100)/10/121.45
=> vl=(0*128+31+68/100)/10/121.45
vl=0.026
g vl=0.026g
3 1f 31
4 3f 63
5 Peak frequency index
(frequency with the
highest vibration
level recorded) 01 1 Freq_index=Value+1=2
Freq_value=(Value+1)*FREQ_SAMPLING
_ACC_LF/256=2*800/256=6,25
-
Hz
Freq_index=2 (<128)
Freq_value=6,25Hz
(reminder:
MPU:
FREQ_SAMPLING_ACC_LF=1000
KX: FREQ_SAMPLING_ACC_LF=800)
5
Temperature
36 54 54-30=24 °C Hardware offset
6
Learning type
01 1 1: Learning from scratch boolean The device is learning from scratch
18-26 FFT values [0;31] 40;7f;5b;
44;67;39;
3c;30;31;
76;30;1c;
33;2b;61;
34;5b;7e;
30;3e;23;
18;37;3f;
33;3f;22;
31;44;4a;
42;45
64;127;91;
68;103; 57;
60;48;49;
118;48;28;
51;43;97;
52;91;126;
48;62;35;
24;55;63;
51;63;34;
49;68;74;
66;69
FFT[0] = 64*vl/127 = 64*0.026/127 =
0.013g
FFT[0] is for frequency index 0 =>
Frequency_hz=(i+1)*FREQ_SAMPLING_A
CC_HF/256 = (0+1)*25600/256 = 100Hz
g