Epson 5000/5500 Signal, Return, Interface Specifications

				Interface Specifications
Signal	Return	Signal	Direction	Description
Pin	Pin
11	29	BUSY	OUT	A HIGH signal Indicates that the printer
				cannot receive data. The signal goes
				HIGH in the following cases:
				1) During data entry (ea. char. time)
				2) During printing
				3) When the PAUSE button is pressed
				4) During an error state.
12	30	PE	OUT	A HIGH signal indicates that the printer
				is out of paper.
13		SLCT	OUT	Pulled up to 5 V through 3.3 Kohm
				resistance.
14			IN	When this signal is LOW, the paper IS
		AUTO
		FEED		automatically fed one line after printing.
		XT		(The signal level can be fixed to this by
				setting DIP switch 2-4 to on.)
15		NC		Not used.
16		GND		Logic ground level.
17		C H A S S	I S -	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	INIT	IN	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.
32			OUT	This level becomes LOW when the
		ERROR
				printer is:
				1) in a paper-out state
				2) when the PAUSE button is pressed
				3) in an error state.

Technical Specifications 7-11