User`s guide

User Manual 53
Appendix B: INTERFACE SPECIFICATIONS
This appendix presents the serial and parallel interface specifications. These specifications
include pin assignments, protocols and detailed information about how to properly interface your
printer with your host or terminal. The Serial ports Communication protocol can only be changed
through the installed emulation.
Serial Interface
Pin Configuration
The RS-232 serial interface uses a female, DB-9 connector.
Pin Direction Definition
1 Tied to in 6 Not used
2 In Receive Data (RxData)
3 Out Transmit Data (TxData)
4 - No connection
5 - Logic Ground
6 Tied to pin 1 Not used
7 Out Request to Send (RTS)
8 In Clear to Send (CTS)
9 Out +5V
Note: Pin 9 is reserved for Keyboard Device Unit (KDU) 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
Three Wire Connection
This method is the simplest method of connecting the printer to a host or terminal. This
method requires Software Protocol Handshaking (XON/XOFF flow control).
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