Century Hawk 4 User Manual page 47

Alternately you can just connect the 3 wires as follows:
Host 25S
TX 2 .........
RX 3 .........
GND 7 .........
pin 4
pin 5
pin 6
pin 20
Baud rate: 9600, 19200, 38400, 57600
(Baud Rate set by DIP switches 7–8)
Data format: always 8 data bits, 1 start bit and 1 stop bit.
Parity: always non parity.
Flow control: RTS/CTS (Hardware flow control).
If you are using software or drivers under the Windows environment, the
flow control must be set to "hardware"
Printer 9P
3 RX
2 TX
5 GND
41
Host 9S
RX 2 .........
TX 3 .........
GND 5 .........
pin 4
pin 6
pin 7
pin 8
Printer 9P
2 TX
3 RX
5 GND