Oki MICROLINE ML521 Reference Manual page 164

Appendix A: Interfacing
This appendix gives the pin assignments for the parallel and serial interfaces of MICROLINE
printers. It also includes the most common serial cable configurations.
Parallel Interface
Note: The parallel cable should be no longer than 6 ft. (1.8m). The cable must be shielded in
order to comply with FCC requirements.
Table 102: Pin Assignments for Parallel Interface Signals
Pin
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
† Pins controlled by jumper plugs in the printer.
* 50 mA maximum.
Signal Return Pin
Strobe 19
Data 1 20
Data 2 21
Data 3 22
Data 4 23
Data 5 24
Data 6 25
Data 7 26
Data 8 27
Acknowledge 28
Busy 29
Paper end 30
Select No return
Autofeed –
Not used –
0V No return
Chassis Ground No return
+5V* –
0V –
I-Prime –
Fault –
0V –
Not used –
Appendix A: Interfacing
Direction
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
–
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