Mask
A hexadecimal string or bit string that indicates the bits in the field selected for testing. If a mask bit is on (1), the corresponding bit in the field is tested. If a mask bit is off (0), the corresponding bit in the field is ignored.
A hexadecimal string or bit string that indicates the bits in the field selected for testing. If a mask bit is on (1), the corresponding bit in the field is tested. If a mask bit is off (0), the corresponding bit in the field is ignored.