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11-9-2005
Backspace (08) <BS>
Purpose:
Horizontal tab (09) <HT>
Purpose:
Line feed (0A) <LF>
Purpose:
carriage return, or display position command is written to the top line. The
test and reset commands stop the scrolling message regardless of the
display position.
08
Decrements the cursor position by one and clears any character displayed
in that position. If the write position is at the lower left, the position is moved
to the upper right, and if it is at the upper left, it is moved to the lower right.
This commands stops the scrolling alphanumeric message if the cursor
position is on the top line when this command is sent.
09
Increments the cursor position by one. No characters are erased. This
command stops the scrolling message if the cursor position is on the top
line when the command is sent. At the end of a line, the display behavior is
determined by the state of the display control mode as follows:
Normal Display Control Mode (DC1)
If the cursor is at the upper right position, it is moved to the lower
left position. If the cursor is at the lower right position, it is moved to
the upper left position.
Vertical Scroll Display Control Mode (DC2)
If the cursor is at the upper right position, it is moved to the lower
left position. If the cursor is at the lower right position, the
characters displayed on the bottom line are moved to the top line,
the bottom line is cleared, and the cursor is moved to the lower left
position.
0A
The display behavior is determined by the state of the display control mode
as follows:
Normal Display Control Mode (DC1)
The cursor is moved to the same position in the complementary
line. In this mode, a line-feed command stops the scrolling
alphanumeric message if the cursor is on the top line when this
command is sent.
Vertical Scroll Display Control Mode (DC2)
If the cursor is on the top line, it is moved to the complementary
position on the bottom line. If the cursor position is on the bottom
line, all characters on that line are moved to the top line, the bottom
Input/output device commands
Appendix A. Input/output device commands
A-5
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