Biostar B550MX/E PRO Manual page 19

JSPDIFOUT1: Digital Audio-out Connector
The connector is for connecting the S/PDIF output bracket.
F_AUDIO: Front Panel Audio Header
This header allows user to connect the chassis-mount front panel audio I/O which supports HD
and AC'97 audio standards.
Note
» It is recommended that you connect a high-definition front panel audio module to this connector to
avail of the motherboard's high definition audio capability.
» Please try to disable the "Front Panel Jack Detection" if you want to use an AC'97 front audio output
cable. The function can be found via O.S. Audio Utility.
COM1: Serial Port Connector
The motherboard has a serial port header for connecting RS-232 Port.
B550MX/E PRO | B550MH/E PRO
Pin Assignment
1 Ground
2 SPDIF_OUT
3 NA
4 +5V
HD Audio AC'97
Pin Assignment Pin Assignment
1 Mic Left in 1
2 Ground 2
3 Mic Right in 3
4 GPIO 4
5 Right line in 5
6 Jack Sense 6
7 Front Sense 7
8 Key 8
9 Left line in 9
10 Jack Sense 10
Pin Assignment
1 Carrier detect
2 Received data
3 Transmitted data
4 Data terminal ready
5 Signal ground
6 Data set ready
7 Request to send
8 Clear to send
9 Ring indicator
10 Key
Chapter 2: Hardware installation | 19
Mic In
Ground
Mic Power
Audio Power
RT Line Out
RT Line Out
Reserved
Key
LFT Line Out
LFT Line Out