Connection with host: The most simple way to connect to other hosts (not PC compatible) or
terminals is:
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
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
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Printer Terminal/Host
Pin 2- RxData ………… TxData
Pin 3- TxData ………… RxData
Pin 5- Ground ………… Ground
In general as long as the data quantity is not too large or you use
Xon/Xoff as flow control, there will be no problem at all.
Baud rate: 2400, 4800, 9600, 19200 and 38400.
(set from bits 6 ~ 8 of DIP switch )
Data format: always 8 data bits, 1 start bit and 1 stop bit.
Parity : always non parity
Handshaking : XON/XOFF as well as CTS/RTS (hardware flow control).
If you run an application with the bundled printer driver under Windows
and use the serial port, you should check the above parameters and set
the flow control to “Xon/Xoff” or “hardware”.
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