Operator's Guide

C-5

 

 

 

 

 

 

 

Signal Pin #

 

 

 

 

 

and

 

Signal Name

Description

 

 

 

Direction

 

 

 

 

 

 

 

 

 

 

 

13

%

ON LINE

When high, this signal indicates the printer is on line

 

 

 

 

and ready to accept data (if not busy).

 

 

 

14

 

0V

Logic GROUND level.

 

 

 

15

 

NC

Not used.

 

 

 

16

 

0V

Logic GROUND level.

 

 

 

17

 

CHASSIS GND

Must be connected to computer chassis to ensure

 

 

 

 

 

 

proper printer operation. Connect to printer chassis,

 

 

 

 

not to signal ground.

 

 

 

18

%

+5 VOLTS

Supplies power for external devices. The current is

limited to 3/4 a. to prevent heavy loads on the power supply. Some computers provide +5 v on this pin. This may cause the printer to appear "on" after the power switch has been turned off. The indicator lights remain lit, but the printer beeps if printing is attempted. In this case, you should open Pin 18 in the cable.

19

STROBE* RET

20

DATA 1 RET

21

DATA 2 RET

22

DATA 3 RET

23

DATA 4 RET

24

DATA 5 RET

25

DATA 6 RET

Pins 19 through 30 are GROUND level returns for Pins

1 through 12.

Parallel Interface Pin Assignments, continued

Page 371
Image 371
Epson 4100 manual Strobe* Ret