Appendix F: Interfacing

This appendix gives the pin assignments for the parallel interface and Universal Serial Bus (USB). It also explains how to install the optional Serial Interface Board and gives the pin assignments for the serial interface.

Pin Assignments for Parallel Interface Signals

PinSignalReturn PinDirection

 

 

 

 

1

Strobe

19

To Printer

2

Data 1

20

To Printer

3

Data 2

21

To Printer

4

Data 3

22

To Printer

5

Data 4

23

To Printer

6

Data 5

24

To Printer

7

Data 6

25

To Printer

8

Data 7

26

To Printer

9

Data 8

27

To Printer

10

Acknowledge

28

From Printer

11

Busy

29

From Printer

12

Paper End

30

From Printer

13

Select

No Return

From Printer

14

Auto Feed

 

To Printer

15

Not used

 

 

16

0V

No Return

Signal Ground

17

Chassis Ground

No Return

Frame Ground

18

+5V *

 

From Printer

19-30

0V

 

Ground

31

Input Prime

 

To Printer

32

Fault

 

From Printer

33

0V

 

Signal Ground

34

Not used

 

 

35

Not used

 

High Level

36

Select In

 

To Printer

* 1.2 mA maximum

ML790/791 Printer Handbook

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