Epson FX-286 Signal, GND, Table E-1,continued, CHASSIS, INIT, ERROR

Table E-1, continued

Signal	Return			Signal	Direc-		Description
Pin	Pin				tion
		SLCT
13					OUT		Pullled up to + 5 volts through 3.3K
							ohm resistance.
14		AUTO FEED			IN		When this signal is LOW, the paper is
		XT					automatically fed 1 line after printing.
							The signal level can be fixed to this by
							setting DIP switch 2-4 to ON.)
15		NC					Unused.
16		OV					Logic ground level.
17			CHASSIS				Printer’s chassis ground, which is
			GND				isolated from the logic ground.
18			NC				Unused.
19 - 30			GND				Twisted-pair return signal ground level.
						IN
							When this level becomes LOW, the
31		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
32		ERROR
							printer is in:
							1) Paper-end state.
							2) Off line.
			GND				3) Error state.
33							Same as for Pins 19 - 30.
34			NC				Unused.
35							Pulled up to + 5V through 3.3K ohm
							resistance.
36						IN	The DC1/DC3 code is valid only when
			SLCT IN
							this signal is “HIGH”. (Internal fixing
							can be carried out with DIP switch pin
							2-1. 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.

3.All interface conditions are based on TTL level. Both the rise and the fall times of each signal must be less than 0.2 microseconds.

E-2