Maple Systems MAP450D - Manual (Page 26)

When the cursor reaches the end of the current display line:
• in Interactive mode, additional characters overwrite the character in the last column,
unless the word-wrap feature is enabled. If word-wrap is enabled, the cursor moves to the
next line of the display.
• in Block or Network mode, the OIT sounds an error beep and stops accepting keypad input.
In Network mode, once the OIT’s ENTER key is pressed, the OIT no longer accepts
keypad input until the host controller either polls or clears the OIT’s Keyboard Input
Buffer. If an attempt is made to enter additional data, the OIT sounds an error beep. Refer
to Appendix A: Control Commands for information on the Clear Output Buffer and Poll
OIT Buffer control commands.
Some of the OIT’s keys behave differently in Interactive mode than they do in Block and
Network modes. The following table lists the behavior of these OIT keys in Interactive,
Block, and Network modes.
OIT Key Interactive Mode Block & Network Modes
Clear
Clears the display and moves the
cursor to the first position of the top
line.
Moves the cursor to the original data
entry starting position and clears all
characters to the right of the cursor.
Delete
Deletes the character to the left of the
cursor and moves the cursor one
position left. If the cursor is on the
last position of a line and a character
is displayed there, the character is
deleted and the cursor remains on the
last position of the line. If the cursor
is on the first position of a line, this
key has no affect unless word wrap is
enabled. With word wrap enabled,
the character in the last position of
the line above is deleted and the
cursor moves to that position.
Deletes the character to the left of the
cursor and moves the cursor one
position left. If the cursor is at the
original data entry starting position, this
key has no affect. If the cursor is on the
last position of a line and a character is
displayed there, the character is deleted
and the cursor remains on the last
position of the line.
Enter
If the line terminator is
ETX
, this key
has no affect. If the line terminator is
CR
, the cursor moves to the first column
of the current line. If the line terminator
is
LF
or
CR/LF
, the cursor moves to the
first column of the next line. If the
cursor is on Line #2 when an
LF
or
CR/LF
is received, any characters on
Line #2 move to Line #1.
Moves the cursor to the original data
entry starting position.
Displaying Text from the Host Controller
The host controller can send data to the OIT’s display by simply sending printable ASCII
characters or by sending control commands and control codes.
Printable ASCII characters are immediately displayed at the OIT cursor’s current
location. The cursor is then advanced one position to the right on the current display line.
When the cursor reaches the end of the current display line, additional characters
overwrite the character in the last column and the cursor does not move, unless the word
wrap feature is enabled, in which case, the cursor drops to the next line of the display.
25 MAP450D Operation Manual
1010-0101, Rev. 00