Chapter 3

Hardware

Parallel Port Interface (J15)

Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The VIA Southbridge provides the parallel port interface signals.

Table 3-13. Parallel Interface Pin/Signal Descriptions (J15)

Pin #

Signal

In/Out

Description

1

Strobe*

Out

Strobe* – This is an output signal used to strobe data into the printer.

 

 

 

I/O pin in ECP/EPP mode.

2

AUTOFDX*

Out

Auto Feed * – This is a request signal into the printer to automatically

 

 

 

feed one line after each line is printed.

3

PD0

I/O

Parallel Port Data 0 – This pin (0 to 7) provides parallel port data

 

 

 

signals.

4

ERR*

Out

Error – This printer output status indicates an error condition on the

 

 

 

printer if the signal state is Low.

5

PD1

I/O

Parallel Port Data 1 – Refer to pin 3 for more information.

 

 

 

 

6

INIT*

Out

Initialize * – This signal is used to Initialize printer. Output in

 

 

 

standard mode, I/O in ECP/EPP mode.

7

PD2

I/O

Parallel Port Data 2 – Refer to pin 3 for more information.

 

 

 

 

8

SLCTIN

Out

Select In – This output signal is used to select the printer. I/O pin in

 

 

 

ECP/EPP mode.

9

PD3

I/O

Parallel Port Data 3 – Refer to pin 3 for more information.

 

 

 

 

10

GND

 

Ground

11

PD4

I/O

Parallel Port Data 4 – Refer to pin 3 for more information.

12

GND

 

Ground

13

PD5

I/O

Parallel Port Data 5 – Refer to pin 3 for more information.

 

 

 

 

14

GND

 

Ground

15

PD6

I/O

Parallel Port Data 6 – Refer to pin 3 for more information.

 

 

 

 

16

GND

 

Ground

17

PD7

I/O

Parallel Port Data 7 – Refer to pin 3 for more information.

 

 

 

 

18

GND

 

Ground

19

ACK*

In

Acknowledge * – This printer output status indicates it has received

 

 

 

the data and is ready to accept new data if the signal state is Low.

20

GND

 

Ground

21

BUSY

In

Busy – This printer output status indicates the printer is not ready to

 

 

 

accept data if the signal state is High.

22

GND

 

Ground

23

PE

In

Paper End – This printer output status indicates the printer is out of

 

 

 

paper if the signal state is High.

24

GND

 

Ground

25

SLCT

In

Select – This printer output status indicates the printer is selected and

 

 

 

powered on if the signal state is High.

26

GND

 

Ground

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

42

Reference Manual

LittleBoard 550

Page 48
Image 48
Ampro Corporation Littleboard 550 manual Parallel Port Interface J15, Pin # Signal In/Out Description