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4.3.4 Blinking or Underlined
Data can be displayed as blinking or
steady. Data can be displayed with or
without underlines.
4.3.5 Cursor Display
The cursor can be displayed either as
steady or blinking .. The cursor can be
either an underline or an inverse video
block.
4.3.6 Control Code Display
Control codes entered at the keyboard
can either be displayed on the screen and
cause no action or not displayed on the
screen and cause some action. Control code
display is limited to program development.
4.4 OTHER SCREEN AND KEYBOARD
FEATURES
The operator can select or inhibit the
following features by setting the Configura-
tion Line.
4.4.1 Margin Bell
When the cursor moves in the forward
direction through the 72nd column of any
line, a beep will sound to warn that the
operator is approaching the end of the line.
4.4.2 Roll
If
a display ASCII code is received at
the last character position of the bottom
line (line 24) and Roll mode is enabled, the
screen data moves up one line, the top line
is lost, and the cursor moves to column 1
of the new blank bottom line.
If
in Non-
Roll mode, the data character will be
ignored and an alarm will sound. Also, the
LF command will not operate and an alarm
will sound.
4.4.3 Key Click
The key click is used to simulate type-
writer sounds each time a key is pressed. In
addition, a click will sound each time a
code is sent when the Auto-Repeat feature
is in effect. This is especially useful in Echo
operation to ensure that a key was pressed.
4-2
4.4.4 CR/Auto-LF
Normally, the RETURN key causes the
cursor to move to column 1 of the same
line.
If
Auto-LF is enabled, the cursor will
advance to column 1 of the next line.
4.4.5 Keyboard Lock
The host can lock the keyboard. When
the keyboard is locked, no keystrokes are
honored by the terminal except the
BREAK key. The function keys are still
active.
The operator may unlock the keyboard
by pressing the SET UP key twice in
succession.
4.4.6 Auto-Repeat
An Auto-Repeat feature allows a key to
be entered multiple times up to 15 char-
acters per second.
4.5 COMMUNICATIONS INTERFACES
4.5.1 Main Communications Port
The main communications port uses an
EIA RS-232C or RS-422A voltage interface.
4.5.1.1 Parity
When parity is enabled, the parity bit
of each transmitted character is set, and a
parity check is done on received data.
When a parity error occurs, the wrong
character is displayed, but it follows the
parity error pattern. When parity is
disabled, the parity bit of each character
is set to 0 and no parity check is done on
received data.
If
even parity is selected, even parity is
checked for on received data and generated
f~r
outgoing data.
If
odd parity is selected,
odd parity is checked for on received data
and odd parity is generated for outgoing
data.
4.5.1.2 Data Transmission
The terminal communicates with the
host using serial 7-bit ASCII code plus a
parity bit. Each transmitted character is
preceded by a start bit or followed by a
. stop bit. Received characters must have the
same number of bits; however, additional
stop bits are allowed.
CP91-00
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