Epson LQ-950 User Manual - Page 284
Serial Interface, format
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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) SLCTIN DClIDC3 (Data on/off control) ERROR BUSY ACKNLG Printing (Disabled/ enabled) on line Low (J9 DCl/DCS High interface) (no effect) High/Low Pulsed ea. char. Enabled (normal cond.) on line High DC1 High Recv'd High/Low Pulsed Enabled ea. char. TIHish 1 ;tIv,d ( High 1 High/Low ( l"(setar. ( Disabled* 1 High 1 ;iierated 1 Disabled * 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. Serial Interface The LQ built-in serial interface is an IX!%232C asynchronous interface with the following characteristics: Data format 1 start bit Data word length: 8 bit Odd, even, or no parity 1 stop bit Bad rate 300,1200,9600,19200 bits per second Technical Specifications 8-13