Epson LQ-1010 manual 237

						Interface Specifications
Signal	Return
Pin	Pin	Signal		Direction		Description
13		SLCT		OUT		Pulled up to + 5 volts through 3.3 Kohm
						resistance.
14					IN	When this signal is LOW, the paper is
		AUTO
		FEED				automatically fed 1 line after printing. (The
						Signal level can be fixed to this by setting
		XT
						DIP switch 2-4 to on.)
15		NC				Not used.
16		GND				Logic ground level.
17		CHASSIS				Printer's chassis ground, which is
		GND				isolated from the logic ground.
18		NC				Not used.
19-30		GND				Twisted-pair return signal ground level.
31	16				IN	When this level becomes LOW, the printer
			INIT
						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.
32				OUT		This level becomes LOW when the printer
			ERROR
						is:
						1) in paper out state.
						2) off line.
						3) in error state.
33		GND				Same as for Pins 19-30
34			NC			Not used
35				OUT		Pulled up to 5V through 3.3 Kohm
						resistance.
36				IN		The DC1/DC3 code is valid only when this
			SLCT IN
						signal is HIGH. (Internal fixing can be
						carried out with Jumper J10. The level of
						this signal is factory-set to LOW.)

Technical Specifications 8-9