Appendix E: 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
Pin | Signal | Return Pin | Direction |
|
|
|
|
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 |
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
ML720/721 Printer Handbook | 107 |