All characters are presented online in the 3270 non-graphics terminal font. The following are some of the limitations of using 3270 non-graphics terminals:
- Graphics, images, and logos cannot be displayed.
- All text strings and logical pages are presented in the same orientation.
- Only one logical page is presented at a time.
If several pages are to be printed on one physical page, only one logical page can be presented on a screen of the 3270/AFP viewer at a time.
- Characters are presented by the symbols to which the terminal device controller is set.
- When more than one character string is located at the same position, only the last one can be displayed.
A 3270 terminal cannot simultaneously display two characters in the same column.
- The position of the text characters is approximate when compared with the printed output because the terminal font size may differ from printer font sizes.
- When text strings use different font sizes and relative positioning (RMI), the text strings may not be properly aligned because 3270 non-graphics terminals can only display one font size.
The 3270/AFP viewer is designed to resolve character spacing at intervals of 20 pels (12 characters per inch) and line spacing at intervals of 30 pels (8 lines per inch).
- On this basis:
- The logical page size is 3200 pels (13 1/3 inches) wide and 2970 pels (12 3/8 inches) deep.
- For documents composed of fixed-pitch fonts of 12 CPI or less, and line spacing of 8 LPI or less, the 3270/AFP viewer should resolve the text to the terminal without loss of information content.
- Using font sizes of more than 12 CPI (for example, GT15, many proportional fonts, and so on), line spacing of more than 8 LPI, or both are likely to result in the loss of textual information.
- When small printer fonts are used, text string overlapping may occur.
For example, if field 1 is one inch wide, many small-font characters can fit into it, but the larger 3270 terminal characters will run over into the next field. If the text string of the next field (field 2) uses absolute coordinate positioning, then this text string will override whatever was previously in field 2.
- The maximum number of pages that can be selected with an index entry is 4095. If the reference points to more than that number of pages, the viewer displays "End of Data" when it reaches page 4096.
- To access all of your data, use multiple index entries.
