Hioki 8910, Инструкция по эксплуатации

Страница: 62 / 150

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