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When the cursor is in the top row position, operation of this command varies
depending on the display mode.
A.
Overlay mode:
Cursor moves exactly where the same column is placed.
B.
Vertical scrolling display mode:
The top row characters scroll to the line, and then the top row characters are
cleared and the cursor is in its original position.
C.
Horizontal scroll display mode:
Cursor fixed.
7.
LFCursor down
ACSII CODE FORMAT
：
LF
Decimal system format
：
[010]
Hexadecimal format
：
[0AH]
Note: cursor moves down one line. The cursor is not visible by default, but
does exist; please turn on/off the cursor by using the US C n command.
When the cursor is in the bottom row position, the command is operated
differently depending on the display mode.
A. Coverage mode: the cursor will move to the top cover for the same
column.
B. vertical scrolling display mode: the bottom row of the top line
character will roll, then the bottom row of the character is cleared, the cursor
