Epson LX-80 Appendix, The Parallel Interface, Pin, tion, Sji,l, Direc, Return, Signal, Description, Table I-1.Pins and signals

Appendix I

The Parallel Interface

The LX-80 printer uses a parallel interface to communicate with the computer; this appendix describes it.

Connector pin assignments and a description of respective interface signals are shown in Table I-1.

Table I-1. Pins and signals

Sji,l	Return	Signal	Direc-		Description
	Pin		tion
1
	19	STROBE	IN	STROBE pulse to read data in. Pulse
				width must be more than 0.5 micro-
				seconds at the receiving terminal.
	E	DATA1	IN	These signal represent information of
z		DATA2	IN	the 1 st to 8th bits of parallel data,
4		DATA3	IN	respectively. Each signal is at HIGH
	;:	DATA4	IN	level when data is logical 1 and LOW
z		DATA5	IN	when it is logical 0.
	z	DATA6	I!
87		DATA7
9	2	DATA8	IN
10	28		OUT	Approximately 12-microsecond pulse
		ACKNLG
				LOW indicates that data has been
				received and that the printer is ready
				to accept	more data.
11	29	BUSY	OUT	A HIGH signal indicates that the print-
				er cannot receive data. The signal
				goes HIGH in the following cases:
				1) During	data entry.
				2) During	printing.
				3) When off-line.
				4) During printer-error state.
12	30	PE	OUT	A HIGH signal indicates that the print-
				er is out of paper.

I-1