User`s guide

Contents cxvii
5250 field attributes
Bit Position Meaning
0 Field attribute flag
0=Not a field attribute
1=Field attribute byte
1 Visibility
0 = Non-display
1 = Display
2 Unprotected/protected
0 = Unprotected data field
1 = Protected data field
3 Intensity
0 = Normal
1 = High
4-6 Field Type
000 =Alphanumeric: all characters allowed
001 = Alphabetic only
010 = Numeric shift: automatic shift for numerics
011 = Numeric only
100=Reserved
101=Digits:
110=Magnetic stripe reader data only
111=Signed Numeric
7 MDT
0 = Field has not been modified
1 = Field has been modified