Asus PRIME B760M-A AX - Motherboard Overview - Internal Connectors; CMOS, COM, and Audio Headers

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13. RTC Battery header
The RTC Battery header allows you to connect the lithium CMOS battery.
14. Clear CMOS header
The Clear CMOS header allows you to clear the Real Time Clock (RTC) RAM in
the CMOS, which contains the date, time, system passwords, and system setup
parameters.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Short-circuit pin 1-2 with a metal object or jumper cap for about 5-10 seconds.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to
re-enter data.
DO NOT short-circuit the pins except when clearing the RTC RAM. Short-circuiting or
placing a jumper cap will cause system boot failure!
If the steps above do not help, remove the onboard button cell battery and short the two
pins again to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the button
cell battery.
15. COM Port header
The COM (Serial) Port header allows you to connect a COM port module.
Connect the COM port module cable to this header, then install the module to a
slot opening on the system chassis.
The COM port module is purchased separately.
16. Front Panel Audio header
The Front Panel Audio header is for a chassis-mounted front panel audio
I/O module that supports HD Audio. Connect one end of the front panel
audio I/O module cable to this header.
We recommend that you connect a high-denition front panel audio
module to this header to avail of the motherboard’s high-denition
audio capability.
PIN 1
VBAT GND
BATT_CON
CLRTC
+3V_BAT GND
PIN 1
PIN 1
COM
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS
PORT1L
PORT1R PORT2R
SENSE_SEND
PORT2L
AGND NC SENSE1_RETUR SENSE2_RETUR
AAFP
PIN 1
HD-audio-compliant
pin definition
PRIME B760M-A AX