Transmit Modified Fields; Defining Fields Programmatically - HP 262SA Reference Manual

Designing and Using Forms
Transmit Modified Fields
Each field in a formatted display has a Modified Data Tag (MDT) associated with it that
indicates whether or not any data has been entered into the field.
When Format mode is turned on (enabled), the MDTs for all fields in the form are automati-
cally set ((off". The entry of any valid characters into a field automatically sets the MDT for
that field to (Con". When one or more fields are cleared through the keyboard (Bor.) the
MDTs for the affected fields are set cCon". When one or more fields are cleared programmati-
cally
(Ec J
or
Ec K),
however, the MDTs for the affected fields are set ((off".
In the Terminal Configuration menu, there is a field labeled Transmi t which specifies
whether all fields in the form or only those fields which have been modified are to be
transmitted to the host computer when the operator initiates a data transfer (using the.
key, for example). IfTransmi t =Modi
f
i edF i elds, then only those fields whose MDTs are set
(Con" are transmitted to the host computer. If Tra nsmi
t
=A
11
Fie
1
ds, then all fields in the
form are transmitted to the host computer regardless of how their MDTs are set.
Defining Fields Programmatically
From a program executing in a host computer, you may define (Cunprotected" and ((transmit-
only" fields with the various attributes by using escape sequences. An
Ec
[specifies the start
of an ((unprotected" field, and
Ec
{specifies the start of a ((transmit-only" field. The sequen-
ces
Ec 6, Ec 7,
and
Ec 8
define the various attributes of each field or subfield, and an
Ec ]
specifies the end of the field.
Refer to Section 4 for the display enhancement escape sequences.
The same sequence of operations applies when defining fields and subfields programmati-
cally as when doing so through the keyboard. For example, if you wish the overall field to
include video enhancements, you must issue the appropriate
Ec
&d sequence before issuing
the
Ec [
or
Ec {
sequence. To define the start of a subfield, you issue an appropriate se-
quence
(Ec 6, Ec 7,
or
Ec 8)
at the point where the subfield is to begin.
The following escape sequences specify field types:
• Ec 6=
• Ec 7=
• Ec 8=
5-6
begin alphabetic field (A through Z, a through z, and space only)
begin numeric field (space, 0 through 9, minus sign, plus sign, comma, and
decimal point)
begin alphanumeric field (all keyboard characters)