Epson LQ-860 User Manual - Page 251
Serial Interface
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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 SLCT IN (Indicator on) DC1/DC3 (Data on/off control) ERROR BUSY ACKNLG Printing (Disabled/ enabled) On line Low (J9 DC1/DC3 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. 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. Serial Interface The built-in serial interface is an RS-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 Baud rate 300, 1200, 9600, 19200 bits per second 8-14 Technical Specifications