Gigabyte B550M S2H User Manual page 18

15) COM (Serial Port Header)
The COM header can provide one serial port via an optional COM port cable. For purchasing the optional
COM port cable, please contact the local dealer.
9 1
10 2
16) TPM (Trusted Platform Module Header)
You may connect a TPM (Trusted Platform Module) to this header.
2 12
1 11
17) CLR_CMOS (Clear CMOS Jumper)
Use this jumper to clear the BIOS configuration and reset the CMOS values to factory defaults. To clear
the CMOS values, use a metal object like a screwdriver to touch the two pins for a few seconds.
• Always turn off your computer before clearing the CMOS values.
• After system restart, go to BIOS Setup to load factory defaults (select Load Optimized Defaults) or
manually configure the BIOS settings (refer to Chapter 2, "BIOS Setup," for BIOS configurations).
Pin No. Definition Pin No. Definition
1 NDCD- 6
2 NSIN 7
3 NSOUT 8
4 NDTR- 9
5 GND 10
Pin No. Definition Pin No. Definition
1 7
LAD0
2 8
VCC3
3 9
LAD1
4 10
No Pin
5 11
LAD2
6 12
LCLK
Open: Normal
Short: Clear CMOS Values
- 18 -
NDSR-
NRTS-
NCTS-
NRI-
No Pin
LAD3
GND
LFRAME
NC
SERIRQ
LRESET
1 2 3