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Epson 4000 User Manual

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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.
ON LINE SLCT IN DC1/DC3 ERROR BUSY
ACKNLG Printing
(Indicator
(Data
(Disabled/
on)
on/off
enabled)
control)
On line
Low (J10 DC1/DC3 High
High/Low Pulsed
Enabled
interface) (no effect)
each
(normal
character condition)
On line
High
DC1
High
High/Low Pulsed
Enabled
Recv’d
each
character
On line
High
DC3
High
High/Low Pulsed
Disabled*
Recv’d
each
character
Off line
High/Low DC1/DC3 Low
High
Not
Disabled
(no effect) (no effect)
generated
l 
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.
8-12 
Technical Specifications