HPE ProLiant DL325 Gen11 User Manual page 183

8. Remove the serial port blank:
a. Detach the right side of the blank.
b. Repeat step a on the left side to remove the blank.
9. Install the serial port:
a. Insert the serial port into the rear panel opening.
b. Install the hex screws.
HPE ProLiant DL325 Gen11 Server User Guide 183