MSI B550 GAMING PLUS Manuel D'utilisation page 38

JCOM1: Serial Port Connector
This connector allows you to connect the optional serial port with bracket.
JBAT1: Clear CMOS (Reset BIOS) Jumper
There is CMOS memory onboard that is external powered from a battery located on
the motherboard to save system configuration data. If you want to clear the system
configuration, set the jumpers to clear the CMOS memory.
Resetting BIOS to default values
1. Power off the computer and unplug the power cord.
2. Use a jumper cap to short JBAT1 for about 5-10 seconds.
3. Remove the jumper cap from JBAT1.
4. Plug the power cord and Power on the computer.
1 DCD
3 SOUT
5 Ground
7 RTS
9 RI
Keep Data
(default)
2 10
1
9
2 SIN
4 DTR
6 DSR
8 CTS
10 No Pin
Clear CMOS/
Reset BIOS
Overview of Components
25