Signal

Return

 

 

 

 

 

 

 

 

 

Pin

Pin

Slgnul

 

Direction

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

32

-

 

 

OUT

 

This level becomes LOW

 

 

ERROR

 

 

 

 

 

 

 

 

 

 

 

 

when the

printer:

 

 

 

 

 

 

 

 

 

1) Is out of paper

 

 

 

 

 

 

 

 

 

2) The Pause button is

 

 

 

 

 

 

 

 

 

pressed

 

 

 

 

 

 

 

 

 

3) Is In an error state

 

 

 

 

 

 

 

 

 

 

 

33

-

GND

 

 

 

Same as for pins 19-30

 

 

 

 

 

 

 

 

 

 

 

1

-ii

1 -

1 NC

1

-

1

Notused

 

I

 

35

-

 

 

 

OUT

 

Pulled up to 5 V through

 

 

 

 

 

 

 

 

1 .O kg resistance

 

 

 

 

 

 

 

 

 

 

 

36

-

NC

 

IN

 

Not used

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:

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

cl “Return” denotes the twisted-pairreturn, to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cub/e for each signal and to complete the connection on the return side.

cl A//interface conditions are based on the TJL level. Both the r!.se and full times of each signal must be less than 0.2 microseconds.

0Data transfer must be carried out by observing the ACKNl G or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNl G signal or when the BUSY signal is LOW.

Initialization

The printer can be initialized (returned to a fixed set of conditions) in three ways:

Hardware initialization

: The power is turned on.

 

*The printer receives an Ksignal from the

 

parallel interface (pln 31 goes LOW).

 

The followlng condltlon then results:

1)The printer mechanism Is Lnltialized.

2)The Input data buffer Is cleared.

3)The download character set is cleared.

4)The print buffer Is cleared.

5)The default values are set.

A-10 Appendix