To connect 4W (4-wire) between a FSII-BASE-II & RTS Matrix XCP-RJ11/12/RJ45 Breakout Panel 4W, you need to switch your selected 4W Port Function on the FSII-BASE-II to: TO PANEL
Attached is an excerpt from the FSII-BASE-II User Guide (ref 399G169D.pdf; page 106):
Pinout for various Port Function as shown on the Left.
Here you can find the various pinout diagrams for the RTS Digital Matrix’s XCP-40-RJ11(RJ12) & XCP-48-RJ45 breakout panels (full pdf attached below):
Additional Technical Details