Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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5-24
Unless the host specifies otherwise, Dynamic Character Font 1 contains a copy of the Static
ASCII Character Font and Dynamic Character Font 2 contains a copy of the Static Special
Character Font. The default contents of these two fonts are shown in Appendix C.
0DQLSXODWLQJ&KDUDFWHU6HWVDQG)RQWV
To change the appearance of characters on the display, several commands allow manipulating the
contents of the character sets and character fonts. The host program can copy between fonts,
down-line load custom characters into the dynamic character fonts, and map any of the character
fonts into either the Standard or Extended Character Sets as shown in Figure 5-3.
Standard
Character
Set
Extended
Character
Set
Accessed by Codes
00-7F (hex)
(0-127) decimal
Accessed by Codes
80-FF (hex)
(128-255) decimal
Copy Character Font Command
Down-line Load Character Font Command
Character Fonts
Character Sets
Map Character Font Command
Static
ASCII
Character
Font
Static
Special
Character
Font
Dynamic
Character
Font 1
Dynamic
Character
Font 2
)LJXUH0DQLSXODWLQJ&KDUDFWHU6HWVDQG)RQWV
The host program would typically use these commands as follows:
1. Send a Copy Character Font command to initialize one or both of the dynamic character
fonts from the static character fonts. (This may not be necessary because they are
automatically initialized by the TCS.)
2. Send a Down-Line Load Character Font command to load custom characters defined by the
host into either dynamic character font. The host may elect to change only a few of the
characters or the contents of the entire dynamic character font.
3. Now that the dynamic character font contains the custom characters required by the host
application, the dynamic character font may be mapped into operation using the Map
Character Font command. This causes the designated character font to become mapped into