IBM Proprinter Emulation
53
Backspace BS
Causes the current line to be printed, and then moves the current print position one space to the left.
The actual distance moved depends on the current character spacing. Backspacing can be done up to,
but not beyond, the left margin.
Control code: BS
Hexadecimal: 08
Vertical Position
Line Feed LF
Causes the current line to be printed, and then advances the paper one line at the current line spacing.
If “Auto CR” is set to “On” in the interface setup menu, a carriage return will also be performed.
Control code: LF
Hexadecimal: 0A
Variable Distance Line Feed ESC J n
Causes the current line to be printed, and then performs a single line feed of n/216ths of an inch.
0≥n≥255. Does not change the current line spacing. If “Auto CR” is set to “On” in the interface setup
menu, a carriage return will also be performed.
Example: The following escape sequence will advance the paper one half inch.
Escape Sequence: ESC J 108
Hexadecimal: 1B 4A 6C
Form Length and Form Feed
Form length is the distance from the top of the form to the bottom of the form. Form length may be
specified either in inches, or in lines. A form feed will advance the paper to the top of the next form.
Some programs do not send form feeds. Instead, they count line feeds, and send the appropriate
number of line feeds to fill out the page. The usual rational is that the program is then in complete
control of form length, and will work on any printer without requiring the correct form length to be set.
However, the correct form length should always be set with the control panel setup. Even if the
program does not use form feeds, the printer will automatically scroll a completed form up to the tear
bar to be torn off. This automatic scroll is based upon form length. The easiest way to set form length
is via the “Form Length” value in the forms menu, so it will be correctly set for everyone using the
form. If correct form length cannot be guaranteed from SETUP, then each program should set the
correct form length.
Set Form Length in Lines ESC C n
Sets the form length to n lines at the current line spacing. 1≥n≥255. Maximum form length is 37.9
inches. Invalid form lengths will be ignored. Overrides the “Form Length” value in the forms menu.
