Epson ActionPrinter 4000 User Manual page 206

Specifications
Interface
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.
ON LINE SLCT IN DC1/DC3 ERROR BUSY
(Indicator
on)
On line Low (J10 DC1/DC3 High
interface) (no effect)
On line
High
On line
High
Off line High/Low DC1/DC3 Low
(no effect) (no effect)
While printing is disabled, character data is being received and acknowledged so
l
that the printer can look for another DC1 character, which would allow it to
resume printing.
Technical Specifications
8-12
(Data
on/off
control)
DC1 High
Recv'd
DC3 High
Recv'd
ACKNLG Printing
High/Low Pulsed
each
character condition)
High/Low Pulsed
each
character
High/Low Pulsed
each
character
High Not
generated
(Disabled/
enabled)
Enabled
(normal
Enabled
Disabled*
Disabled