EPSON Stylus Pro and Pro XL

Pin assignments

Signal

Return

 

 

 

 

 

 

 

pin

pin

Signal

Direction

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

19

 

 

STROBE

IN

STROBE pulse to read

 

 

 

 

 

 

 

data.

 

 

 

 

 

 

 

 

 

2

20

 

 

DATA 1

IN

These signals represent

3

21

 

 

DATA 2

IN

information in bits 0 to 7 of

4

22

 

 

DATA 3

IN

parallel data respectively.

5

23

 

 

DATA 4

IN

Each signal is at HIGH level

6

24

 

 

DATA 5

IN

when data is logical 1 and

7

25

 

 

DATA 6

IN

LOW when it is logical 0.

8

26

 

 

DATA 7

IN

 

 

9

27

 

 

DATA 8

IN

 

 

 

 

 

 

 

About a 5-μs pulse. LOW

10

28

 

ACKNLG

OUT

 

 

 

 

 

 

 

indicates data has been

 

 

 

 

 

 

 

received and the printer is

 

 

 

 

 

 

 

ready to accept more data.

 

 

 

 

 

 

 

 

 

11

29

 

 

BUSY

OUT

A HIGH signal indicates the

 

 

 

 

 

 

 

printer cannot receive data.

 

 

 

 

 

 

 

The signal goes HIGH in the

 

 

 

 

 

 

 

following cases:

 

 

 

 

 

 

 

1) During data entry

 

 

 

 

 

 

 

(for each character)

 

 

 

 

 

 

 

2) During initialization

 

 

 

 

 

 

 

3) During self test and

 

 

 

 

 

 

 

default-setting printing

 

 

 

 

 

 

 

4) During a printer-error

 

 

 

 

 

 

 

state

 

 

 

 

 

 

 

 

 

12

30

 

 

PE

OUT

A HIGH signal indicates the

 

 

 

 

 

 

 

printer is in a paper-out

 

 

 

 

 

 

 

state or in an error state

Signal

Return

 

 

 

pin

pin

Signal

Direction

Description

 

 

 

 

 

33

-

GND

-

Same as for pins 19-30

 

 

 

 

 

34

-

NC

-

Not used

 

 

 

 

 

35

-

+5 V

OUT

Pulled up to +5 V through

 

 

 

 

1 KΩ resistance

 

 

 

 

 

36

-

NC

-

Not used

 

 

 

 

 

Notes:

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

❏“Return pin” denotes the twisted-pair return pin 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 ACKNLG or BUSY 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.

Timing chart

The figure below shows the timing chart for the parallel interface.

13

-

 

SLCT

OUT

Pulled up to +5 V through

 

 

 

 

 

 

1 kΩ resistance

 

 

 

 

 

 

 

 

 

 

 

 

IN

When this signal is LOW,

14

-

 

AUTO

 

 

 

FEED

 

the paper is automatically

 

 

 

XT

 

fed one line after printing

 

 

 

 

 

 

 

15

-

 

NC

-

Not used

 

 

 

 

 

 

 

16

-

 

GND

-

Logic ground level

 

 

 

 

 

 

 

17

-

CHASSIS

-

Printer’s chassis ground,

BUSY

ACKNLG

DATA

STROBE

0.5 μs (Min.)

0 μs (Min.)

 

 

GND

 

which is connected to the

 

 

 

 

 

 

logic ground

 

 

 

 

 

 

 

18

-

 

NC

-

Not used

 

 

 

 

 

 

 

19-30

-

GND

-

Twisted-pair return signal

 

 

 

 

 

 

ground level

 

 

 

 

 

 

 

 

 

 

 

 

 

When this signal goes LOW,

31

16

 

INIT

IN

 

 

 

 

 

 

the printer controller is reset

 

 

 

 

 

 

to its state when the power

 

 

 

 

 

 

is first turned on and the

 

 

 

 

 

 

print buffer is cleared. This

 

 

 

 

 

 

level is normally HIGH; its

 

 

 

 

 

 

pulse width must be more

 

 

 

 

 

 

than 50 μs at the receiving

 

 

 

 

 

 

terminal.

 

 

 

 

 

 

 

 

 

 

 

This signal level goes LOW

32

-

ERROR

OUT

 

 

 

 

 

 

when the printer:

 

 

 

 

 

 

1) Is out of paper

 

 

 

 

 

 

2) Is in an error state

 

 

 

 

 

 

3) Has no ink cartridges

 

 

 

 

 

 

installed

5 μs (Typ.)

0 μs (Min.)

Transition time (both the rise and the fall) of every signal must be less than 0.2 μs.

Serial Interface

The printer’s built-in serial interface is based on the RS-422 standard to allow the printer to be connected to an Apple Macintosh.

Standard:

Based on RS-422

Synchronization:

Asynchronous

Bit rate:

57.6 Kbps/230.4 Kbps

Handshaking:

DTR and XON/XOFF protocol

EPSON Stylus Pro and Pro XL-4

8/1/95

Ink Jet Printers