Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 480

Additional interfaces
Installing the expansion card with the serial interface
Figure 323: Installing the expansion card with the serial interface
▶ Install the expansion card with the serial interface into PCIe slot 5.
▶ Fasten the expansion card with the serial interface with the two screws.
480 Upgrade and Maintenance Manual RX2540 M7