Epson LQ-800 OUT, OUT, GND, GND, GND, F-2, 14 —, tion, SLCT, INIT, Direc, Signal, Notes:, Return denotes the, Table F-1.Pins and signals (continued)

Table F-1. Pins and signals (continued)

Signal Return

Pin Pin

12 30

13 —

14 —

15—

16—

17—

18—

19-30 —

3116

32—

33—

3 4	—
35	—
3 6	—

	Signal			Direc-	Description
				tion
				OUT	A HIGH signal indicates that the printer
	PE
SLCT					IS out of paper.
				OUT	Pulled up to + 5 volts through 3.3k ohm
					resistance.
				IN	When this signal is LOW, the paper is
	AUTO
	FEED				automatically fed 1 line after printing.
XT					(The signal level can be fixed to this by
					setting DIP switch 2-8 to ON.)
		—		—	Unused.
	GND			—	Ground for twisted-pair grounding.
CHASSIS				—	Printer’s chassis ground, which is
GND					isolated from the logic ground.
NC				—	Unused
GND				—	Grounds for twisted-pair grounding.
				IN	When this level becomes LOW, the
		INIT
					printer controller is reset to its power-up
					state and the print buffer is cleared. This
					level is usually HIGH, its pulse width
					must be more than 50 microseconds at
					the receiving terminal.
				OUT	This level becomes LOW when the
			ERROR
					printer is in:
					1) Paper-end state.
					2) Off-Line.
					3) Error state.
GND				—	Same as for Pins 19-30.
	—			—	Unused.

—OUT Pulled up to + 5V through 3.3k ohm resistance.

SLCT	-	IN	The DC1/DC3 code is valid only when
IN			this signal is HIGH. (Internal fixing can
			be carried out with DIP switch 2-7. The
			level of this signal is factory-set to LOW.)

Notes:

1.The column heading Direction refers to the direction of signal flow as viewed from the printer.

2.Return denotes the twisted-pair return, to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side. To prevent noise, these cables should be shielded and con- nected to the chassis of the host computer or the printer but not at both ends.

F-2