Epson LQ-850X User Manual - Page 264
Technical, Specifications, Logic ground level.
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Signal Pin 12 13 14 15 16 17 18 19-30 31 32 33 34 35 36 Return Pin 30 Signal Direction Description PE O U T A HIGH signal indicates that the printer is out of paper. SLCT O U T Pulled to +5 volts through 3.3 Kohm resistance. AUTO FEED XT NC I N 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 2-8 to on.) Not used. GND Logic ground level. CHASSIS GND Printer's chassis ground, which is isolated from the logic ground. NC Not used. GND Twisted-pair return signal ground level. INIT I N 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. ERROR O U T This level becomes LOW when the printer is: 1) in paper out state 2) off line 3) in error state. GND Same as for Pins 19-30. NC Not used. O U T Pulled up to 5V through 3.3 Kohm resistance. SLCT IN I N The DC1/DC3 code is valid only when this signal is HIGH. (Internal fixing can be carried out with Jumper J1. The level of this signal is factory-set to LOW.) Technical Specifications 8-11