Reads unsigned packed mainframe data.
Unsigned refers to an unsigned packed field type for mainframe data, storing two decimal digits per byte.
Unlike the packed type, unsigned does not contain a sign indication in the lower half of the rightmost byte. Each half of a byte contains one hexadecimal digit representing the decimal digit of that position in the number. The length of this field type is a maximum of 11 bytes or, in other words, 22 decimal digits. The number of decimal places cannot exceed the maximum number of digits possible for this field.