User's Manual Printer ActionPrinter 4500

Interface Specifications
Printing Enabled/Disabled Signals and Control Conditions
The table below shows the relationship between printing being enabled
or disabled, the on line/off line status, and the receipt of the data
on/off control characters, DC1 or DC3.
off line High/Low DC1/DC3 Low
High
Not Disabled
(no effect) (no effect)
generated
*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.
Technical Specifications 8-11