Hi,
thank you to keep us busy.
It would be more motivating if you give the informations rather than let us find out..
***
It still is no SPI.
It is just a synchronous serial interface.
And the solution is similar than already given in post #2, just replace the signal names:
* CKO CMOS level --> RS485 transmitter IC --> 40 m twisted pair --> RS485 receiver IC --> CKI CMOS level
* SDO CMOS level --> RS485 transmitter IC --> 40 m twisted pair --> RS485 receiver IC --> SDI CMOS level
Klaus