User's Guide 79
Appendix B: INTERFACE SPECIFICATIONS

Introduction

This appendix presents the interface specifications of I/O ports for the printer. These
specifications include pin assignments, protocols and detailed information about how to
properly interface your printer with your host or terminal.

Serial

The RS-232 connector on the printer side is a female, DB-9.
Pin Direction Definition
1In DSR
2In RxData
3Out TxData
5-Ground
6Out DTR
7Out RTS
8In CTS
9Out +5V
Note: Pin 9 is reserved for KDU (keyboard device unit) only, therefore do not
connect this pin if you are using a general host like a PC.