Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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Any of the four character fonts can be mapped into either the Standard or Extended Character
Sets. This provides a method to rearrange the contents of the character sets or to display custom
characters. The mapping between the character fonts and character sets can vary from screen to
screen (screen-dependent). Whenever a stored screen is copied into the Displayed Screen, the
mapping between the character fonts and the character sets can change automatically to match
that specified by the stored screen.
When using the Down-Line Load Character Font Command to load custom characters into
dynamic character fonts, note the following:
•
If either of the dynamic character fonts is currently mapped into the Standard or Extended
Character Set within the Displayed Screen, the display immediately reflects the new contents
of the dynamic character font. If the custom characters were incorrectly specified by the
Down-Line Load Character Font Command, the appearance of the display may become
unreadable since the pixel patterns representing each character change.
•
Whenever a stored screen is copied into the Displayed Screen, the character font mapping
may be automatically changed. Normally this is not a problem as the dynamic character fonts
contain default information initialized from the static character fonts or properly down-line
loaded custom characters from the host. However, if the custom characters were incorrectly
specified by the Down-Line Load Character Font Command, the appearance of the display
may become unreadable since the pixel patterns representing each character change.
To restore characters on the display to their default representations, the host could perform any
one of the following steps. They are listed in order of minimal loss of data or programming:
•
Use the Map Character Font command to map the Static ASCII Character Font and the Static
Special Character Font into the Standard and Extended Character Sets, respectively.
•
Use the Initialize Screen command to reinitialize the Displayed Screen.
•
Issue a Soft Reset command.