Star Micronics LC-1521 Appendix C Interface Pin Outs, Parallel Interface, Pin Name Function

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Appendix C: Interface Pin Outs

Parallel Interface

Pin					Name			Function
1			STROBE					Goes low for ≥0.5μs when active.
2					DATA0			These signals represent information for the 1st through 8th bit of parallel data,
								respectively. Each signal is HIGH when data is logical 1, and LOW when logical
3					DATA1
								0.
4					DATA2
5					DATA3
6					DATA4
7					DATA5
8					DATA6
9					DATA7
10							ACK	10μs low to acknowledge receipt of data.
11					BUSY			Printer sets line low when ready to receive data.
12					PAPER			High when paper runs out.
13			SELECT					High when printer is on-line.
14						AFXT		Printer ignores this signal
15								Not used.
16	SIGNAL GND							Signal ground
17		CHASSIS						Chassis ground (isolated from signal ground)
18							+5V	+5V DC output from printer
19 - 30						GND		Twisted pair ground return
31					RESET			Printer is reset when this signal goes low.
32				ERROR				Low when printing cannot continue due to error.
33		EXT GND						External ground
34 - 35								Not used
36		SELECT IN						Printer ignores this signal

Optional Serial Interface (IS-8H192 and SPC-8K)

Pin	Name	Function
1	GND	Printer chassis ground
2	TXD	Data from printer
3	RXD	Data to printer
4	RTS	Always space
5	CTS	Space when computer is ready to send data. Printer ignores this signal.
6		Not used.
7	GND	Signal ground
8 - 10		Not used.
11	RCH	Printer sets line to space when ready to receive data. Same signal as Pin 20.
12 - 19		Not used.
20	DTR	Printer sets line to space when ready to receive data.
21 - 25		Not used.