Epson FX-286 The Parallel Interface, Pin, Pin, tion, Direc, Signal, S i g n a l, R e t u r n, Description, Table E-1.Pins and signals

Appendix E

The Parallel Interface

The FX-286 printers use 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 E-1.

Table E-1. Pins and signals

S i g n a l	R e t u r n	Signal	Direc-	Description
Pin	Pin		tion
			IN	STROBE pulse to read data in. Pulse
1	19	STROBE
				width must be more than 0.5
				microseconds at the receiving
				terminal.
2	20	DATA 1	IN	These signals represent information of
3	21	DATA 2	IN	the 1st to 8th bits of parallel data,
4	22	DATA 3	IN	respectively Each signal is at HIGH
5	23	DATA 4	IN	level when data is logical 1 and LOW
6	24	DATA 5	IN	when it is logical 0.
7	25	DATA 6	IN
8	26	DATA 7	IN
9	27	DATA 8	IN
			OUT	Approximately, 12-microsecond pulse.
10	28	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
				printer cannot receive data. The signal
				goes HIGH in the following cases:
				1) During data entry (ea. char. time)
				2) During printing
				3) When Off Line
				4) During printer-error state
12	30	PE	OUT	A HIGH signal indicates that the
				printer is out of paper.

E-1