Star Micronics NX-15 user manual 189

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189

The printer will report that it has run out of paper by making the PAPER OUT signal on pin 12 high. This pin can be held low by turning DIP switch 1-5 off. When the printer is in the on-line state, pin 13 is held high. This signal (SELECTED) tells the computer that the printer is ready to receive data.

Table F-1

Parallel interface pin functions

Pin No.	~i:;:l
	Direction
1	STROBE IN

Function

Signals when data is ready to be read. Signal goes from HIGH to LOW (for at least 0.5 microseconds) when data is available.

2	DATA1	IN
3	DATA2	IN
4	DATA3	IN
5	DATA4	IN
6	DATA5	IN
7	DATA6	IN
8	DATA7	IN
9	DATA8	IN
10	ACK	OUT

These signals provide the information of the 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 O.

ALOW pulse acknowl-edges receipt~ data.

11	BUSY	OUT	When this signal goes LOW the printer is
			ready to accept data.

12 PAPER OUT OUT

13 SELECTED OUT

14-15 N/C

16SIGNAL GND

17CHASSIS GND

18“+ 5VDC OUT 19-30 GND

31RESET IN

This signal is normally LOW. It will go HIGH if the printer runs out of paper. This signal can be held LOW permanent ly by turning DIP switch 1-5 off.

This signal is HIGH when the printer is on-line.

Unused Signal ground.

Printer’s chassis ground, isolated from logic mound.

External supply of + 5VDC.

Twisted pair return signal ground level.

When this signal goes LOW the printer is reset to its power-on condition.

32	ERROR	OUT	This signal is normally HIGH. This
II		I	signal goes LOW to signal that the
			[pfinter~annot Print duetoan error condi-1
ad	L,’x L “L. LJ		UALLLI.	CI, &
34, 35	NIC		Unused.
136	SELECTIN	I	Data entm to the printer is possible only
I	I		Iwhen	this_ level is LOW.
1	I	1	1