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Designing and Using I?orms
One approach to generating a form structure through the
keyboard is to load two of the user keys with the
<SO)
and
<5 I)
codes (control-N and control-O, respectively, with
display functions mode enabled), define both as Local keys,
define their labels as
"line Drs","
and
"8s!!le set",
respectively, and enable them by pressing
1lIiI.
Then draw
the form structure and alphanumeric annotations using
the Base set as illustrated in figure
~4.
As the form is
evolving, use the cursor control keys and the two user keys
to switch the linear structure portions of the form to the
Line Drawing character set. When doing this, however, be
sure that those portions of the form that will be used for
data fields are set to the Base set (figure 5-5 shows three
lines of the sample forin and the various points at which
you would use the
<SO)
and
<5 I)
codes). You may also, if
you wish, load some of the more repetitive line definitions
(such as the second and third lines in figure 5-5) into user
keys to speed up the drawing of the main body of the form.
DEFINING FIELDS
When format mode is enabled, all of display memory is
"protected" except those portions which have been ex-
plicitly defined as "unprotected"or "transmit-only" fields.
Protected Data
The terminal operator cannot alter or delete any charac-
ters that lie within a protected area. Protected characters
are NOT transmitted to the host computer. The line seg-
ments and annotations that constitute the form's structure
are typically designated as protected data.
Unprotected Fields
The operator enters data into unprotected fields. When the
operator presses
II,
the data in unprotected fields is
transmitted to the host computer. When a character is
entered into the final position of an unprotected field, the
cursor automatically advances to the start of the next
unprotected field. The operator may use the . . and
_
keys to move the cursor to the start of the previous or
next unprotected field, respectively.
I---j----J---.
II
~::;
o
I
I
I
II
=;5
55
55
55
01
01
01
01
.--+---t---------1Ift--1 - -
5
I]
S
A5CII
(50) code
o
Transmit-Only Fields
The operator may use the cursor control keys to move thee
cursor to a transmit-only field and then alter or delete
characters within the field. Note that the cursor NEVER
automatically moves to a transmit-only field (the . .
and _
keys skip over any transmit-only fields). When
the operator presses
II,
the data in transmit-only fields
is transmitted to the host computer. When a character is
entered into the final position of a transmit-only field, the
cursor automatically advances to the start of the next
unprotected field.
Field Attributes
When defining an unprotected or transmit-only field, you
must specify a field type (which has a set of implied at-
tributes) and some explicit field attributes. Some of the
attributes are checked as each data character is entered
into the field, others are checked when the cursor is ready
to leave the field, and still others are checked when the
data in the form is to be transmitted to the host computer.
The implicit attributes are:
1. The set of characters which may be entered into the
field.
2. The format restrictions, if any, for data items entered
into the field.
3. Automatic editing, if any, that is performed when the (
cursor leaves the field.
Table 5-1 summarizes the implicit attributes associated
with each field type.
The explicit attributes are:
1. Whether or not the terminal operator MUST enter a
data item into the field
(REGU I REDIOPTI ONAl).
2. Whether or not the data entry in the field is to be
automatically justified when the cursor leaves the field
(JUSTIFY/NO JUSTIFY).
3. Whether or not every character position in the field
must be filled by the terminal operator
(TOTAL F I ll/NO
TOTAL FIll).
'--+---4+11·
.----It-.-.---.--
II
II
I
I I I
~3S
~35
55
SS~3S~3~;
01
01
01
01010101
t+-----·+t--·--·-----·-t--t--H-1
5
I
ASCII
<.'31) code
(
Figure 5-5. Use of Shift-In and Shift-Out Codes
5-4
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