Intermec VT220/ANSI, Руководство программиста

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SECTION 4
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RT1700 Radio Terminal
4-2 VT220/ANSI Terminal Emulation Programmer’s Reference Guide
Screen Modes
The radio terminal has these screen modes: center cursor,
corner, page, lazy, screen lock, and locked. The modes pres-
ent a window onto a standard VT220 terminal’s 80-charac-
ter by 24-line display buffer. You can set the type of screen
mode through the radio terminal’s firmware menus.
The screen modes govern which portion of the larger VT220
terminal’s screen the radio terminal first presents and how
the window moves as the cursor moves.
Center Cursor Mode
Center cursor mode works best for applications that use the
entire VT220 data stream’s 80-character by 24-line logical
display. In this mode, the cursor remains in the center of
the radio terminal’s window.
As the cursor moves within the window, the radio terminal’s
display window moves to keep it centered. When the cursor
moves off the right, left, top, or bottom edge of the larger
80x24 display, the window remains fixed despite the cur-
sor’s movement.
Corner Mode
Corner mode begins with the window in the upper left cor-
ner of the larger VT220 terminal. It keeps the cursor in the
lower right corner of the display. Corner mode works best
for applications that use the upper left corner of the logical
screen.
As the cursor moves off the right or bottom edge of the radio
terminal’s display, the window moves to show the cursor.
When you use corner mode with the gold-colored key, you
can move the cursor a predetermined number of key presses
in all four directions.