First Alert T-1000 Technical, Specifications, 6-6 Technical Specifications

Technical	Specifications
Signal	Return
P i n	P i n	S i g n a l		Direction	Description
1 6	-	OV	-		Logic ground level.
17	-	CHASSIS			Printer's chassis ground, which is isolated
		G N D	-		from the logic ground.
1 8	-	N C	-		Unused.
1 9 - 3 0	-	GND	-		Twisted-pair return signal ground level.
3 1	-	INIT		I N	When level becomes LOW, the printer
					controller is reset to its power-up state
					and the print butter is cleared. This level
					is usually HIGH; its pulse width must be
					more than 50 µs at the receiving
					terminal
3 2	-	ERROR		OUT	This level becomes LOW when the printer
					is in:
					1) Paper-end state
					2) Off line state
					3) Error state.
3 3		G N D			Same as for Pins 19 - 30.
34		NC	-		Unused.
35	-	-	-		Pulled up to +5 V through 3.3 K
					resistance.
36	-			IN IN	The DC1/DC3 code is valid only when
		SLCT
					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.)

6-6Technical Specifications