Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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The Reverse Index command is a relative cursor movement command. It moves the cursor up one
line without affecting the cursor’s column position.
The Reverse Index command differs from the Move Cursor Up command in that if the cursor is
on the top line of the scrolling region when the Reverse Index command is sent, the region is
scrolled down. (If the scrolling region is the entire screen, the screen is scrolled down.)
If the cursor is outside the scrolling region when this command is issued, the cursor is moved up
one line until it reaches the top edge of the screen. Subsequent attempts to move the cursor
beyond the edge of the screen are prevented and do not scroll the screen.
When the cursor is moved between normal lines and double-width or double-size lines, the
cursor moves across the screen horizontally as well as vertically. This is because the cursor
follows character column positions, which are in different physical locations on the screen for
normal and double-width (or double-size) lines. (Double-width and double-size lines are 40
columns wide, and normal lines are 80 columns wide.) For example, as the cursor moves
between column 40 on a double-size line and column 40 on a normal line, the cursor’s physical
position jumps from the right margin of the screen on the double-size line to the center of the
screen on the normal line.
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None. (This is a remote command only.)
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<ESC>M
-or-
<RI> can be used when the host and TCS are communicating using 8 data bits.
Moves the cursor up one line in the same column. If the cursor is already on the top line of
the scrolling region, this command causes the region to scroll down.