Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 14)

2 Variable Content TTL:Chap Is Linked To HD:Running
Publication 2711E-6.15 – November 1998
Example 1: Character String Display and Overwrite
The display is defined as 10 characters wide by 3 characters high. The
characters are single height and single width. The string to be displayed is “A
long string for the ASCII display.”
The object will show:
A long
string for
the ASCII
The last word of the string is lost, because the object isn’t large enough for
the whole string.
A second string, “This shows how characters overwrite,” is sent while the
first one is displayed.
This shows
how ng for
characters
Any character which was not directly covered by a new character remained
in the display. This feature can be useful for updating portions of an ASCII
display while leaving portions unchanged. If you want to clear the display, or
clear a line in the display, embed control characters for those purposes in the
string.
To properly display the second string shown above, a “clear to end of
display” control sequence, ESC[J, could have been included at the beginning
of the string.
The string would then be: “ESC[JThis shows how characters overwrite,”
which would display:
This shows
how
characters
Notice that there is no space between the control sequence and the text.
Also see “Special Characters and Control Sequences,” and “Invalid Control
Sequences,” later in this chapter.