I spent time trying to gather information to make this project and it was successfull .As a result ,I decided to share it to make it easy for everyone to find all the project in one place.

Step 1: Arduino Connection

We are tying to apply this sketch . So the arduino connection will be as the shown picture .

Then by
taking 4 external wires from :

pin 29 (green) //Data

pin 30 (Yellow) //Clock

5V (red) //+ve

ground (blue) //- ve

** the handwritten sketch is copied from :

https://www.instructables.com/id/Arduino-PS2-Barco...

Step 2: Connect to Barcode Scanner

We will look at the terminal with wires(in the above picture) of the connector as male data pins .

Connecting the 4 taken wires(from previous step) to the wires of that connector (data with data , ground with ground , clock with clock and power with power ).
** connection is by spinning each wire on the corresponding one .
Now connect the socket of the connector to the ps2 barcode scanner .