Pin

 

 

Signal name

GND

In/Out

Description

 

n o .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

Host Busy

30

In

Set LOW to indicate that host

 

 

 

 

 

 

 

 

can receive peripheral

 

 

 

 

 

 

 

 

device to host data. Then set

 

 

 

 

 

 

 

 

high to acknowledge receipt

 

 

 

 

 

 

 

 

of that nibble. Set high in

 

 

 

 

 

 

 

 

response to PtrClk

 

 

 

 

 

 

 

 

(nAck) low pulse to m-enter

 

 

 

 

 

 

 

 

reverse data transfer phase.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In

Set LOW to initialize the winter.

31

 

 

INIT

 

 

30

 

 

 

 

 

 

 

 

 

32

 

 

 

29

out

This signal is LOW when the

 

 

DataAvail/

 

 

 

 

DataBit-0,4

 

 

printer is in an error state.

 

 

 

 

 

 

 

 

 

36

 

 

1284-Active

30

In

Set HIGH during 1284 mode.

 

 

 

 

 

 

 

 

 

18

 

 

Logic H

 

out

This line is pulled up to +5V

 

 

 

 

 

 

 

 

through 3.9 k

resistance.

 

 

 

 

 

 

 

 

 

3 5

 

 

+5V

-

O u t

This line is pulled up to +5V

 

 

 

 

 

 

 

 

through 3.3 k

resistance.

 

 

 

 

 

 

 

 

 

 

 

17

 

Chassis

-

-

Chassis

GND.

 

 

 

 

 

 

 

 

 

 

 

 

16, 33,

 

 

GND

-

-

Signal

GND.

 

19-30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15 ,34

 

 

NC

-

-

Not connected.

 

 

 

 

 

 

 

 

 

 

 

In/Out shows the direction of signal flow as viewed from the printer.

A-16 Specifications, Command Summary, and Character Tables