Epson ActionPrinter 4000 User Manual - Page 220
Printing Enabled/Disabled Signals and Control Conditions, data on/off control characters, DC1 or DC3.
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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 (Indicator on) Fon line on line SLCTIN DC1/DC3 ERROR BUSY (Data on/off control) ACKNLG Low (J10 DC1/DC3 High interface) (no effect) High/Low Pulsed ea. char. High DC1 High Recv'd High/Low Pulsed ea. char. Printing (Disabled/ enabled) Enabled (normal cond.) Enabled on line High DC3 High Recv'd High/Low Pulsed Disabled* ea. char. off line High/Low DC1/DC3 Low High (no effect) (no effect) Not Disabled 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. 8-12 Technical Specifications