NEC Express5800 User Manual page 223

3.
Route the cable so that it does not interfere with the other PCI board, and connect the
cable to the serial port B connector on mother board.
See the figure below for connector location.
IMPORTANT:
polarity of connector.
Serial port connector
4.
Make sure that the removed slot cover, screw, or tools are not left in the server. Then,
reassemble the server.
5.
Run the BIOS SETUP utility to configure the serial port B.
Select [Advanced: - [I/O Device Configuration] - [Serial Port B] - [Enabled].
Connect the cable properly by making sure the
Upgrading Your Server 9-29