Adtech iMASTER – A1 Series User Manual page 168

A1-User's Manual
5) 16 bit CRC generation
The step of CRC generation is as follows:
1. All of 16-bit Parameter is 1.0xffff
2. The exclusive OR of 16-bit Parameter and 8-bit Parameter.
3. Shift right side 1bit 16-bit Parameter
4. If the result of step 3 is 1, exclusive OR 16-bit Parameter and 0xa001.
5. Execute 8 times step 3 and step 4.
6. Execute step 2∼6 until data completion.
7. Exchange the step 6 result of higher 8bit and lower 8bit.
Ex) the case of d01 output frequency reading.
Byte 1
Communication
Number
0x01
The sequence of addition Byte (01x01)
16-BIT PARAMETER
(Exclusive OR)
01
Shift 1
Shift 2
Polynomial
Shift 3
Shift 4
Polynomial
Shift 5
Shift 6
Polynomial
Shift 7
Shift 8
Polynomial
Byte 2 Byte 3
Command Parameter
0x03 0x01
MSB
1111 1111 1111
0000 0001
1111 1111 1111
0111 1111 1111
0011 1111 1111
1010 0000 0000
1001 1111 1111
0100 1111 1111
0010 0111 1111
1010 0000 0000
1000 0111 1111
0100 0011 1111
0010 0001 1111
1010 0000 0000
1000 0001 1111
0100 0000 1111
0010 0000 0111
1010 0000 0000
1000 0000 0111
Byte 4 Byte 5
0x01
Flag
1111
1110
1111
1111 1
0001
1110
1111
1111 1
0001
1110
1111
1111 1
0001
1110
1111
1111 1
0001
1110
１６４
Byte 6
Parameter number
0x00 0x01