34 Interface Specifications
Appendix B: Interface Specifications
A. INTRODUCTION
This section details 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 ter minal.
Serial
The RS232 connector on the printer side is a female DB-9.
Pin Direction Definition
1 In DSR
2 In RxData
3 Out TxData
5 - Ground
6 Out DTR
7 Out RTS
8 In CTS
9 Out +5V
Note:
Pin 9 is reserved for factory use only. Do not connect this pin if you
are using a general host like a PC.
Connection with host:
Host 25S Printer 9P Host 9S Printer 9P
(PC or compatible) (PC or compatible)
DTR 20....................1 DSR DTR 4 .......................1 DSR
DSR 6 ......................6 DTR DSR 6 ........................6 DTR
TX 2.........................2 RX TX 3 ..........................2 RX
RX 3.........................3 TX RX 2..........................3 TX
CTS 5.......................7 RTS CTS 8........................7 RTS
RTS 4.......................8 CTR RTS 7.........................8 CTS
GND 7.....................5 GND GND 5......................5 GND
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