General Measure M02 - Page 52

M02 Digital Indicator
47
6.2.3.7 Zeroing
Send command:
STX
Scale no.
Channel No.
O
CZ
CRC
CR
LF
Correct response:
STX
Scale no.
Channel No.
O
CZ
O
K
CRC
CR
LF
Wrong response:
STX
Scale no.
Channel No.
O
CZ
E
Error code
CRC
CR
LF
For example:
02 30 31 31 4F 43 5A 38 34 0D 0A
Correct response: 02 30 31 31 4F 43 5A 4F 4B 33 38 0D 0A
Wrong response: 02 30 31 31 4F 43 5A 45 35 30 36 0D 0A（Operation can’t execuate）
6.2.3.8 CRC computation
All the values in front of the parity bit add together and convert to decimal data,
then convert the last 2 bits to ASCII code (decade in front and the unit at the back).
For example
The following is a frame of data:
0
2
3
0
3
1
3
1
4
F
4
3
5
A
3
8
3
4
0
D
0
A
Add 02~5A: 180(Hex),convert to decimal data: 384. We can calculate from this