I want to sniff some data from a SPI Bus between boards from a loom machine. The bus starts at J9 from PCB 5722 and goes through 8 boards named PCB 5778, which I guess are the slaves. The connector where the BUS starts has 14 pins and some of them are /OUTEN_EXP, SI, CKOUT+, CKOUT-, CEOUT+ and CEOUT-. The BUS goes through connectors J3 and J4 of each 5778 board and comes back to PCB 5722 on connector J10 which seems to have 2 termination resistor between CKOUT+ and CKOUT- and CEOUT+ and CEOUT-

Is that normal for SPI to have CKOUT+ and CKOUT- and CEOUT+ and CEOUT-? Looks like differential pairs. After some research I found that in some cases LVDS can be used on SPI to increase the length of the bus. Is that the case?

Also, the lack of more CE pins leads me to think it's connected in a Daisy-Chain topology.

Any tips on how can I sniff the data from this BUS?