Epson LQ-570 Input buffer capacity, Skip-over-perforation, Continuous paper page length, Tear off, Auto line feed, Specifications and pin assignments, MICRO FEED buttons

LQ-570+

Input buffer capacity

The printer stores print data. sent from your computer in its input buffer. Keep DIP switch 1-7 off to select an 8Kbyte buffer.

Skip-over-perforation.

Turning DIP switch l-8 on when you are using continuous paper enables the skip-over-perforation function Use this function to leave a l-inch (25.4mm) margin between the last printable line on one page and the first printable line on the next page. This causes the printer to skip over the perforation between continuous sheets.

Most application programs take care of the top and bottom margins. Do not turn on skipover-perforation unless your program does not provide these margins.

Adjust your top-of-form position with the MICRO FEED buttons to get half of the margin at the bottom of one page and half at the top of the next page.

Continuous paper page length

When you are printing on continuous paper, DIP switches 2-1 and2-2 let you select from the four page lengths described in DIP-switch Table 5.

Tear off

When you turn DIP switch 2-3 on, the tear-off feature is automatic when using continuous paper. The printer automatically advances the last printed page to the tear-off position You can then easily tear off the printed paper.

The printer automatically returns the paper to the loading position when it receives more print data. You can also return the paper to the loading position by pressing the TEAR OFF button or the LOAD/EJECT button

Use the tear-off feature only with continuous paper loaded with the push tractor. Do not use the tear-off feature with the pull tractor.

Auto line feed

When auto line feed is on (DIP switch 2-4 on), the printer accompanies each carriage-return code (CR) received with a linefeed code (LF).

If your printer is double spacing, turn DIP switch 2-4 off. If each line overprints the next, turn DIP switch 2-4 on

Interface Specifications

Your printer is equipped with a parallel interface.

Specifications and pin assignments

The built-in parallel interface has the following characteristics:

Datajkrzat:	8bit parallel
SlphXhdkWl:	STROBl?	pulse
Handshake timing:	BUSY and m signal
Signal led:	TTL compatiile level
GPlnector:	3+1-i 5 7-30360 (Amphenol) connector
	or equivalent

Connector pin assignments and a description of their respective interface signals are shown in the following table.

Signal

Return

.

Pin

Pin

Slgnal

Dlrectlon

Descrltilon

I

19

STROBE

IN

STROBE

pulse to read data. Pulse

wrdth must be more than 0.5

1;;ctmos%$XXrds at the receiving

;:

DATA 1

These signals represent rnformatron

DATA

2

of the 1 si to 8th bits of parallel data,

22

DATA

3

respectively. Each signal is at HIGH

23

DATA

4

level when data IS logical 1 and

;z

DATA

5

LOW when it is logical 0.

DATA 6

26

DATA 7

27

DATA 8

10

28

OUT

About an 11 -mrcrosecond pulse.

ACKNLG

LOW indicates that data has been

received and that the printer is

ready to accept more data.

BUSY

OUT

HIGH sianal indicates that the

printer ¬ receive data. The

signal goes HIGH in the following

CXSB:

1) During data entry (ea. char. time)

2) During pnnhng

3) Durrng

PAUSE

4) Durina orinter-error state

PE

OUT

A HIGH sranal indicates that the

printer is &t of paper.

13

-

SLCT

OUT

-

14

Am

IN

When this signal is LOW, the paper

FEED

1s automatically fed 1 line after

x-r

printing. (The signal level can be

fixed to this by setting DIP switch

-

2-4 to ON.)

15

NC

Not used.

11

GND

-

16

GND

17

CHASSIS

-

Printer’s chassis ground which IS

-

NC

18

1930

GND

-

Twisted-parr return signal ground

level.

31

16

INIT

IN

When this level becomes LOW, the

printer controller is reset to its

power-up state and the print buffer

is cleared. This level is normally

HIGH; its pulse width must be more

than 50 microseconds at the

receiving

terminal.

32

-

OUT

This level becomes LOW when the

ERROR

printer is: 1) in paper out state, 2) in

PAUSE state, 3) in error state

33

-

GND

-

Same as for Prns 1 Q-30.

34

-

NC

-

Not used.

35

-

-

OUT

Pulled up to 5V through 3.3 Kohm

36

-

IN

The DCl/DC3 code is valid only

SLCT IN

when thus signal is HIGH. This

signal IS

always LOW.

Note:

•The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

. “Return” denotes the twisted-pair return, to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side.

•All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds.

•Data transfer must be carried out by observing the m orBUSY signal, (Data transfer to this printer can be carried out

only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW.)

24-Pin Printers 5/93 LQ-570+ - 5