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Keyboard Control
After a hard reset or turning off the power, the terminal
reverts to the mode specified by the remotellocal designator
in non-volatile memory.
Character/Block Modes
When the terminal is connected on-line to a remote host
computer, it operates in either of the following data
transmission modes:
• Character Mode. In this mode, data is transmitted a
character at a time as it is entered through the keyboard.
ASCII control codes (such as <CR) and <IF)), if
generated using keystrokes, are transmitted.
• Block Mode. In this mode, data is NOT transmitted at
the time it is entered through the keyboard. Instead, you
transmit. an entire block of data by first typing the data
(after initially typing the data you can move the cursor
around and edit the data as desired) and then pressing
the
II
key.
When the terminal is in block mode, ASCII control codes
(such as < CR) and < IF> ) are acted upon locally but NOT
transmitted with the data block.
From the keyboard, you enable and disable block mode
using the "BLOCK MODE" ( . . ) key.
From a program executing in a host computer, you enable
and disable block mode using the following escape se-
quences:
ENABLE: <ESC)t.k1B
DISABLE: <ESC)t.kOB
A characterlblock mode designator is maintained in non-
volatile memory. When you change modes using the "BLOCK
MODE" key, you also alter that mode designator in non-
volatile memory. When you change modes using the escape
sequences, however, the designator is NOT altered.
After a hard reset or turning off the power, the terminal
reverts to the mode specified by the characterlblock desig-
nator in non-volatile memory.
The relationship between block, line, page, and format
modes is described under "The ENTER Key" later in this
section.
Format Mode
The terminal includes a format mode in which elaborate,
custom-designed forms containing protected data, un-
protected fields, and transmit-only fields can be displayed
on the screen and used for data entry. The unprotected and
transmit-only fields can be defined with a variety of at-
tributes including data checking and automatic field
editing.
When format mode is enabled, the terminal operator may
only enter data into unprotected or transmit-only fielgs. If
the operator positions the cursor in a protected area and
then attempts to type data, the cursor automatically moves
3-2
to the start of the next subsequent unprotected field and
then the terminal accepts the data.
The designing of forms and the use of format mode are
described in section V of this manual.
From the keyboard, you enable and disable format mode
using the "FORMAT MODE" key in the "def
i
ne f teld5"set of
function keys.
From a program executing in a host computer, you enable
and disable format mode using the "FORMAT MODE" key.
ENABLE: <ESC)W
DISABLE: <ESC)X
Once format mode is enabled, it remains enabled until
explicitly disabled, until a hard reset is performed, or until
the power is turned off.
Line Modify Mode
When the terminal is in remote mode and character mode
and you are communicating interactively with a host com-
puter, you may sometimes enter an erroneous command
string to which the computer responds with an error
message. If the command string is a lengthy one and the
error consists of only a few characters, it is a nuisance to
have to retype the entire string. In such a case you may
instead enable line modify mode (which temporarily
switches the terminal to a special form of block mode). You
may then move the cursor to the erroneous line on the
display and correct the command string. When the string is
edited to your satisfaction, you retransmit the line to the
host computer by pressing either the _
key or the
II
key.
Note that while line modify mode results in a block
transmission, it is completely independent of the block
mode function described earlier in this section (you do NOT
have to first enable block mode). In fact, line modify mode is
a feature that was specifically designed for use when the
terminal is operating in character mode.
From the keyboard, you enable line modify mode using the
"L1
tolE MODI FY" key. Line modify mode is automatically
disabled when you press either _
or
II.
If you change
your mind and wish to disable line modify mode before
retransmitting the command string, press the "L1 tolE
MODI FY" key again (the asterisk disappears from the key
label and the terminal is back in normal character mode).
Note that for most lines on the screen, the terminal remem-
bers which character was the first (leftmost) one that you
entered through the keyboard. This means that when you
retransmit a line in modify mode, only the keyboard entry
portion of the line (the entire edited command string) is
retransmitted; any prompt characters preceeding the com-
mand string are ignored by the terminal. For more detailed
information about this feature, refer to the discussion of
the Start Col field of the terminal configuration menu in
Section II, Configuring the Terminal, of this manual.
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