Epson LQ-500 User Manual page 89

Interface Specifications
Printing enabled/disabled signals and control conditions
The table below shows the relationship between printing being
enabled or disabled,
data on/off control characters, DC1 or DC3.
the
While printing is disabled, character data is being received and acknowledged
*
so that the printer can look for another DC1 character, which would allow it to
resume printing.
5-10 Technical Specifications
on line/off line status, and the receipt of
the