3. Interface Specifications
Connection with host:
Introduction
Host 25S
Printer 9P
Host 9S Printer 9P
(PC or compatible)
(PC or compatible)
This appendix presents the interface specifications of IO 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.
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
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
Alternatively you can just connect the 3 wires in the following way.
Host 25S
Printer 9P
Host 9S Printer 9P
(PC or compatible)
(PC or compatible)
TX 2
……….. 2 RX
TX 3
……….. 2 RX
RX 3 ……….. 3 TX
RX 2 ……….. 3 TX
GND 7 ……….. 5 GND
GND 5 ……….. 5 GND
pin 4
pin 4
pin 5
pin 6
pin 6
pin 7
pin 20
pin 8
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.
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