Star Micronics DP8340RC user manual Connectors and Signals, Ack

7-3.		Connectors and Signals
	Pin No.	Signal Name				IN/OUT	Function
							Signals when data is ready to be read.Signal
1			STROBE			IN	gose from HIGH to LOW (for at least 0.5
							microsec.) when data is available.
							These signals provide the information of the
2-9		DATA1-8				IN	first to eighth bits of parallel data.Each signal
							is at HIGH level for a logical 1 and at a LOW
							level for a logical 0.
							A 9 microsecond LOW pulse acknowledges
10				ACK		OUT
							receipt of data.
							When this signal goes LOW, the printer is ready
							to accept data. When the printer is in one of
11				BUSY		OUT	the conditions below.”HIGH” is set.
							1. Data being entered.
							2. Off line.
							3. Error condition.
12				PAPER		OUT	This signal is normally LOW. It will go HIGH
				OUT			if the printer runs out of paper.
	13	SELECTED				OUT	This signal is HIGH when the printer is online.
	14-15				N/C		Unused
16			SIGNAL				Signal ground.
				GND
17		CHASSIS					Chassis ground, isolated from logic ground.
				GND
	18				N/C		Unused
	19-30			GND			Twisted pair return signal ground level.
							When this signal gose LOW, the printer is reset
31				RESET		IN
							to its power-on condition.
							This signal is normally HIGH. This signal goes
							LOW to signal that the printer cannot print
32			ERROR			OUT
							due to an error condition.
							Refer to Item 7-6 Emergency Suspension.
	33	EXT GND					External ground.
	34-36				N/C		Unused.

Figure 7-3. Parallel Interface Connector (Printer side)

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