ASCII
Character Code
--------- -----
  '0'      0x30
  '1'      0x31
  '2'      0x32
  '3'      0x33
  '4'      0x34
  '5'      0x35
  '6'      0x36
  '7'      0x37
  '8'      0x38
  '9'      0x39