Solution
The connection between the ECU, NI SLSC, NI PXI/CompactRIO, and the host interface is described in this document. The RTI connects between the NI SLSC and NI PXI/CompactRIO.

RTI-12302, RTI-12303, RTI-12304, RTI-12305, and RTI-12344 are Level 1 compliant as described in this link. The RTI should be selected based on the bus type of the PXI modules. You can compare the bus type in this link or this link.
More detailed information about the AL-3011 is available in this document. The J1 and J2 front I/O connectors are 44-pin high-density D-SUB, and you can use compatible cables for them.