Intermec CV30 Intermec Terminal Emulator (ITE) Programmer's Reference Manual - Page 48

Chapter 1 - About 3270 and 5250 Programming • Magnetic Stripe Reader (MSR) entry field, which enables the scanner for an input field. • Selector Light Pen (SLP) entry field. SLP is accepted, but ignored. • Transparency entry field, a field that can contain data of any value. • Self-Check Self-check on the controller provides additional integrity for data entry. All field types can be specified for self-checking. The following requirements must be met when specifying a field for self-checking: • An FCW must be defined for the field. Hex B1A0 selects Modulus 10 checking, and hex B140 selects Modulus 11. • Field lengths for checking are restricted to 33 positions. For signed numeric fields, only 32 positions can contain digits and the sign is not checked. If more than 33 characters are given a LUSTAT parameter error results. Self-check resolves fields and conditions as follows: • The function converts nonnumeric characters (including nulls and blanks) by using the four low-order bits from their EBCDIC representation when the low-order bits are in the range 0-9. For example, A in EBCDIC is C1, thus A = 1. R in EBCDIC is D9, thus R = 9. A "0" replaces all other characters with the four low-order bits in the range of A through F. For example, % is EBCDIC 6C, thus % = 0. Null and blank characters also convert to 0. All high-order nulls, zeros, and blanks in a field are converted to 0 and do not affect the value of the check number. • An all-null field checks correctly. This field can result when the operator unsuccessfully tried to enter digits into a field and checking fails. The controller enables the operator to exit the field from the first position by using the Field Exit key. About the Start of Field Attribute Information The next table describes the attribute portions of the Start of Field order: Start of Field Order Attribute Descriptions Hex Code 20 21 24 2F 30 Description Normal (dark characters on light background) Reverse image (light characters on dark background) Underscore Nondisplay Column separator Results: The Start of Field order does the following: • The display address is set to the end-of-field address, as specified by the last SF order + 1. This does not happen if this is the first SF order or if a Set Buffer Address order precedes it (the SBA points at the field starting attribute). 36 Intermec Terminal Emulator (ITE) Programmer's Reference Manual