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And the length of ACK must be 12, and format is
Z0_072+0025Z
Byte 1: Always 'Z'
Byte 2: ACK
Byte 3: Always '_'
Byte 4~6: function code
Byte 7: sign byte, '+' or '-'
Byte 8~11: the current value after writing
Byte 12: Always 'Z'
And 'ACK' value is
0: Right command and function
1: Illegal Format
2: Illegal Function
3: Illegal Action,
4: Illegal Adjusted Situation,
5. Written value is over up limit,
6. Written value is over down limit
If the ACK is 0, 5, 6, program will deal this command. If ACK = 5, program writes the legal
maximum value to the setting. If ACK = 6, writes the legal minimum value to the setting.
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