Epson LQ-510X User Manual - Page 202
Same as for Pins 1 Q-30., level is normally HIGH; its pulse width
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Signal Pin 13 Return Pin Signal - SLCT oniecDrti OUT 14 - Auto IN - -FEED XT 15 NC - 16 GND - 17 - CHASSIS - - GND - 18 - NC - 19-30 - GND - 31 16 INIT IN 32 - ERROR OUT 33 - GND 34 - NC 35 -- OUT 36 - SLCT IN IN Description Pulled up to +5 volts through 3.3 Kohm resistance. When this signal is LOW, the paper is automatically fed 1 line after printing. (The signal level can be fixed to this by setting DIP switch 2-4 to on.) Not used. Logic ground level. Printer's chassis ground, which is isolated from the logic ground. Not used. Twisted-pair return signal ground level. When this level becomes LOW, the printer controller is reset to its power-up state and the print buffer is cleared. This level is normally HIGH; its pulse width must be more than 50 microseconds at the receiving terminal. This level becomes LOW when the printer is: 1) in paper out state. 2) off line. 3) in error state. Same as for Pins 1 Q-30. Not used. Pulled up to 5V through 3.3 Kohm resistance. The DC1/DC3 code is valid only when this signal is HIGH. (Internal fixing can be carried out with Jumper J10. The level of this signal is factory-set to LOW.) 8-10 Technical Specifications