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Note :
The simplest way to connect to other hosts (not PC compatible) or
terminals is:
Pin 9 on OS-204/214/314 and pin 1 on OS-203 are reserved for
KDU(keyboard device unit), therefore do not connect these
pins 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
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 and you
use Xon/Xoff as flow control, it will be problem free.
Baud rate: 2400, 4800, 9600, 19200 and 38400.
(programmable by command)
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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