Signal

Return

 

 

 

 

 

 

 

Pin

Pin

Signal

Direction

Description

 

 

 

 

 

 

 

 

 

18

—

Logic H

OUT

Pulled up to +5 V through

 

 

 

 

 

 

 

 

3.9 KΩ resistance

 

 

 

 

 

 

 

 

 

19-30

—

 

GND

—

Twisted-pair return signal

 

 

 

 

 

 

 

 

ground level

 

 

 

 

 

 

 

 

 

31

30

 

 

 

 

IN

When this signal goes LOW,

 

 

INIT

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

32

29

 

 

OUT

This signal level goes LOW

 

ERROR

 

 

 

 

 

 

 

 

 

when the printer:

 

 

 

 

 

 

 

 

1) Is out of paper

 

 

 

 

 

 

 

 

2) Is in an error state

 

 

 

 

 

 

 

 

3) Has no ink cartridges

 

 

 

 

 

 

 

 

installed

 

 

 

 

 

 

 

 

 

33

—

 

GND

—

Same as for Pins 19-30

 

 

 

 

 

 

 

 

 

34

—

 

 

NC

—

Not connected

 

 

 

 

 

 

 

 

 

35

—

 

+5 V

OUT

Pulled up to +5 V through

 

 

 

 

 

 

 

 

3.3 KΩ resistance

 

 

 

 

 

 

 

 

 

36

30

 

SLIN

IN

Not used

 

 

 

 

 

 

 

 

 

Note:

❑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.

Technical Specifications A-11