Printer User Manual

Chapter 2 Operating Your Compact Printer
Page 18
2.7 DOT ADDRESSABLE GRAPHICS
The MSP/MPP Compact Printers can print special symbols, graphs and characters if operated
in the Dot Addressable Graphics mode.
During the Dot Addressable Graphics mode of operation, the printer prints one dot line at a time.
Each horizontal dot line is made out of (1x6) dot cells, and the total number of dot cells per line
is the same as the maximum number of columns on the printer.
For example, a model MSP-II-24 Column has a total of 24 (1x6) dot cells corresponding to its
24 column capacity.
Each dot in a (1x6) dot cell can be turned ON or OFF by sending specific ASCII characters.
The graphics mode is invoked by sending ASCII characters 'ESC' (1B/27) followed by 'G'. Dot
line printing starts upon receiving enough dot cells to complete a dot line, or
ASCII 'CR' (0DH) or ASCII 'LF' (0AH).
The graphics mode is terminated by sending ASCII characters 'ESC', followed by 'A'.
2.7.1 GRAPHIC CHARACTER SET
The graphic character set extends from the character '?'(3FH) to TILDA (7EH). Bits 1
through 6 of the characters received are used to turn ON or OFF the dots in a dot
cell.
If a bit is set (=1), a dot is enabled, otherwise the dot is disabled.
For example for ASCII '?' (3FH or 00111111B), bits 1 through 6 are set. Sending
consecutive '?'s will form a one dot solid line across the paper.
2.7.2 GRAPHICS CHARACTER HEX DOT PATTERNS
The following table, Table 1, outlines the dot patterns and HEX codes for graphics
operation.
Table 1
Dot patterns and HEX codes