Argox R Series - Manual (Page 61)

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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
The most simple way to connect to other hosts (not PC
compatible) or terminals is:
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: 600, 1200, 2400, 4800, 9600, 19200 and 38400.