Fujitsu PRIMERGY RX2520 M4 Upgrade And Maintenance Manual page 341

Serial interface
Figure 241: Installing the serial interface (A)
Ê Insert the serial interface into the slot cover (1).
Ê Connect the cable to the connector "SERIAL" on the system board (2)
Figure 242: Installing the serial interface (B)
Ê Fasten the serial interface with two hexagon bolts (see circles).
Upgrade and Maintenance Manual 341
RX2520 M4