Epson FX-80 Operation Manual page 53

(3) Escape codes
In order to expand its processing capability, the· printer is provided with control
codes called the ESC sequence.
ESC code (27)D followed by any alphanumeric or symbolic character (MSB is
ignored), gives special functions to the printer.
For example,
1) To set column length
2) To enter Bit image print mode, etc.
In ESC sequence codes, a, n or m represent 7- or 8-bit binary numbers.
Depending on the MSB control codes, the following values are derived.
(i) MSB=l 128 to 255
(ii) MSB=O 0 to 127
(iii) MSB=as it is 0 to 255
Generally, printer control codes, especially like "ESCAPE", i.e., CHR$(27), are
not standardized. Every computer and printer manufacturer applies its own
meaning to such codes.
The "ESCAPE" codes used in the printer should not be confused with the escape
key which some computers have. So be familiar with these control codes.
(4) Buffer-full print
When a full line of print data (including spaces) has been input and the next data is
valid and printable, the contents of the print buffer will be automatically printed
followed by a line feed. Printing in this manner is called "Buffer-full print."
At this tiine, the Enlarged print mode set by the SO code is cancelled.
When power is applied to the printer, the column width in each print mode
becomes as follows;
FX-80 FX-100
Pica-sized mode 80 columns 136 columns
Condensed mode 132 columns 233 columns
Note that for the FX-80, the column width in Condensed print mode is 5 condensed
characters less than the width in normal print mode.
However, since the right margin is set as an absolute position, the column width set
to 80 columns in the Pica-sized print mode will become 137 columns, in the
Condensed mode.
For the FX-lOO, the buffer-full position is the same at power ON and when the right
margin is set.
Also, when the left margin is set by ESC 1, the buffer becomes full at the right
margin setting in effect at that time.
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