6.2 Editing the CAN Definition Data
54
6.2.3
Setting the data start position
The least significant bit (LSB) position of acquisition data is used to
specify its location in the CAN data frame.
The bit positions are numbered as follows:
1.
As the reference position, the least significant bit (LSB) position of the
first byte of data in the data frame is given a value of 0. From there, the
number is increased by one towards the most significant bit (MSB)
position.
2.
From the MSB position, it moves to the next byte data, and the
number is incremented by one from the LSB toward the MSB.
3.
Since the maximum size of the data frame section is 8 bytes (64 bits),
the MSB position in the 8th byte from the beginning is numbered 63.
Therefore, the bit positions can be expressed with numbers from 0 to
63, as shown below.
7
6
5
4
3
2
1
0
15 14 13 12 11 10
9
8
7
6
5
4
23 22 21 20 19 18 17 16
31 30 29 28 27 26 25 24
39 38 37 36 35 34 33 32
47 46 45 44 43 42 41 40
55 54 53 52 51 50 49 48
63 62 61 60 59 58 57 56
3
2
1
0
0
1
2
3
4
5
6
7
bit
byte
←
MSB
LSB
→
↑
Beginning
End
↓
Example
: 8-bit data in the second byte from the beginning is specified.
Since its least significant bit (LSB) position is Bit 0 in Byte 1, the bit position is 8.
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4
・・・
Massage beginning
Massage end
→
Most significant bit
Least significant bit
byte 0
byte 1
byte 2
byte 3
Summary of Contents for 8910
Page 1: ...8910 Instruction Manual CAN ADAPTER EN Aug 2018 Revised edition 7 8910A981 07 18 08H ...
Page 2: ......
Page 8: ...Contents vi ...
Page 18: ...Notes on Use 10 ...
Page 44: ...3 5 Operation Map 36 ...
Page 48: ...4 2 Program Setup 40 ...
Page 56: ...5 4 Operation Flowchart 48 ...
Page 78: ...6 6 Editing in Another Window 70 ...
Page 90: ...7 4 Setting the ID Filter 82 ...
Page 99: ...91 9 2 Setting Data Printout ...
Page 130: ...10 2 Using the 8910 with the 8841 8842 MEMORY HiCORDER 122 ...
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