Signal

Return

 

Signal

 

Direction

Description

Pin

Pin

 

 

 

 

 

 

 

 

 

 

 

 

18

-

 

NC

 

 

Not used

 

 

 

 

 

 

 

19-30

 

 

GND

-

Twisted-pair return signal ground

 

 

 

 

 

 

level

 

 

 

 

 

 

 

 

 

 

-

 

 

 

31

16

 

INIT

 

IN

When this level becomes LOW,

 

 

 

 

 

 

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 us at the receiving

 

 

 

 

 

 

terminal.

 

 

 

 

 

 

 

32

-

 

 

 

OUT

This level becomes LOW when:

 

ERROR

 

 

 

 

 

 

 

1) The paper-is out

 

 

 

 

 

 

2) The PAUSE button is

 

 

 

 

 

 

pressed

 

 

 

 

 

 

3) An error occurs

 

 

 

 

 

 

33

-

1

GND

-

Same as for pins 19-30

 

 

 

 

 

 

 

34

 

 

NC

 

 

Not used

 

 

 

 

 

 

 

35

-

 

 

 

 

Pulled up to 5 V through 1 .O kR

 

 

 

 

 

 

resistance

 

 

 

 

 

 

 

36

 

 

NC

 

 

Not used

 

 

 

 

 

 

 

Note:

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

“Return” denotes the twisted-pair return, 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 the 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 BUSY signal is LOW.

A p p e n d i x A - 9