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ML720/721 Printer Handbook 107
A
ppendix E: Interfacing
* 1.2 mA maximum
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19-30
31
32
33
34-
35
36
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
From Printer
From Printer
From Printer
From Printer
To Printer
Signal Ground
Frame Ground
From Printer
Ground
To Printer
From Printer
Signal Ground
High Level
To Printer
Strobe
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Acknowledge
Busy
Paper End
Select
Auto Feed
Not used
0V
Chassis Ground
+5V *
0V
Input Prime
Fault
0V
Not used
Not used
Select In
Pin Signal Direction
19
20
21
22
23
24
25
26
27
28
29
30
No Return
No Return
No Return
Return Pin
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