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finger print (sm630)

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nadia32

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hi
i am new with programming and i want to run this finger print
for adding a new person to system i should use this cod:
Code:
0x4D + 0x58 + 0x10 + 0x03 + 0x40 + [U]0x00 + 0x00[/U] +[B] 0xF8[/B]
which the last byte is the check sum
in data sheet says that :
Check sum:
Low 8 bytes of the SUM from packet head to check sum.

but what should i do when my id is more than 7? because check sum will more than one byte??!!!!
 
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