This setting specifies the maximum number of characters that can be printed on a single line for 3812 and 3287 printing. If the host passes down a line that exceeds the maximum, Reflection automatically wraps the line.
Depending on your printer driver, font, and font size, the actual number of characters that can be printed on a line can vary. Use the button in the printer panel to find out the number of columns you can actually print.
As you change , Printer Chars per Inch may changes as well; more characters on a line means more characters per inch (assuming the left and right margins don't change).