Star Micronics LaserPrinter4 manual Serial interface Pin No Signal Direction Function Name

●Serial interface

Pin No.	Signal	Direction	Function
	Name
1	GND	—	Chassisground.
2	TXD	OUT	Carriesdatafromtheprinter.
3	RXD	IN	Carriesdata to the printer.
4	RTS	OUT	Onwhenthe printeris readyto
	N/C		reeeivedata.
5-6			Unused.
7	GND	—	Signalground.
8-19	N/C		Unused.
20	DTR	OUT	Onwhenthe printeris readyto
21-25	N/C		receivedata.
			Unuswl.

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