Epson MX-80F/T manual out

						Table 5			(cont.)
Signal	Return				-
				Signal		IDirection					Description
Pin No.	! Pin No.	I
18	-			NC						Not used.
9 to30	-			GND						TWISTED-PAIR	RETURN signal GND level.
-
										When the level of this signal becomes
										“LOW”, the printer controller is reset to its
31	-			lNlT			In			initial state and the print buffer is cleared.
										This signal is normally at “HIGH” level, and
										its pulse width must be more than 56~s at
					--					the receiving terminal.
										The level of this signal becomes “LOW”
						out				when the printer is in -
32				ERROR						1. PAPER END state
										2. OFF-LINE state
										3. Error state
33	-			GND		-			Same as with Pin Nos. 19 to 30.
34	-			NC						Not used.
35										Pulled up to +5V through 4.7KD resistance.
										Data entry to the printer is possible only
								1		when the level of this signal is “LOW”.
36	-		SLCT IN				In			(Internal fixing	can be carried out with DIP
										SW 1-8. The condition at the time of
									shipment is set “LOW’ for this signal.)

NOTES: 1. “Direction” refers to the direction of signal flow as viewed from the printer.

2.“Return” denotes “TWISTED PAIR RETURN” and is to be connected at signal ground level.

As to the wiring for the interface, be sure to use a twisted-pair cable for each signal and never fail to complete connection on the Return side. To prevent noise effectively, these cables should be shielded and con- nected to the chassis of the host computer and the printer, respec- tively.

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

4.Data transfer must not be carried out by ignoring the ACKNLG or BUSY signal. (Data transfer to this printer can be carried out only after con- firming the ACKNLG signal or when the level of the BUSY signal is “LOW”.)

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