Star Micronics LC-90 manual Parallel Interface, Optional Serial Interface

Appendix C: Interface Pin Outs /	Annexe C: Disposition des broches pour interfaces
Anhang C: Interface-Pin-Belegung	/ Appendice C: Uscite a terminale interfaccia

Parallel Interface

Pin			Name		Function
1	STROBE				Goes low for ³0.5ms when active.
2			DATA0		High when active.
3			DATA1		High when active.
4			DATA2		High when active.
5			DATA3		High when active.
6			DATA4		High when active.
7			DATA5		High when active.
8			DATA6		High when active.
9			DATA7		High when active.
10					10ms low to acknowledge receipt of data.
				ACK
11			BUSY		Printer sets line low when ready to receive data.
12			PAPER		High when paper runs out. Can be disabled with the User Setup Utility.
13	SELECT				High when printer is on-line.
14			AFXT		Normally high.
15					Not connected.
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					Printer is reset when this signal goes low.
			RESET
32					Low when printing cannot continue due to error.
		ERROR
33	EXT GND				External ground
34 - 35					Not connected
36	SELECT IN				Normally low.

Optional Serial Interface

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

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