Hello
How can i use the CS I/O port to communicate between tow CR1000 (i want to save the first CR1000 data's in the seconde)
You need to add devices to convert CSIO to a serial port.
The least expensive option would probably be one SC932A on each datalogger and part 13657 (female to female null modem cable) between them.
If you have an open pair of control ports on each datalogger, you could use those instead.
The dataloggers will need some settings changed. This blog article shows how to use Network Planner to figure it out.
https://www.campbellsci.com/blog/many-possibilities-of-pakbus-networking