The data format is 4 digits less than 4 digits using 0 complement Follow
The data format is 4 bits less than 4 digits, using 0 to complement, When using the serial number, enter a value of 0, then the system displays 0001. When you enter 300, 0300 is displayed. That is, when the format is 4 bits, the 0 point is used.
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