Asus Pro B660M-C D4 - Page 12

1-4
13. COM Port headers
These headers are for serial (COM) ports. Connect the serial port module cables
to these headers, then install the modules to slot openings at the back of the
system chassis.
14. COM Debug header
This header allows connection to a COM Debug card.
The COM Debug Card is purchased separately.
15. Front panel audio header
This header is for a chassis-mounted front panel audio I/O module that
supports HD audio standard. 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.
• If you want to connect a high-denition front panel audio module
to this header, set the Front Panel Type item in the BIOS Setup
to [HD Audio]. By default, this header is set to [HD Audio].
16. LPT header
The LPT (Line Printing Terminal) header supports devices such as
a printer. LPT standardizes as IEEE 1284, which is the parallel port
interface on IBM PC-compatible computers.
17. M.2 slot (Key E)
This slot allows you to install an M.2 (WIFI) module.
The M.2 Wi-Fi module is purchased separately.
18. Mono-out header
This internal Mono-out header allows connection to an internal, low power
speaker for basic system sound capability. The subsystem is capable of driving
a speaker load of 3 Watts RMS at 4 Ohms.
19. System Management Bus header
The System Management Bus (SMBus) connector allows you to
connect a SMBus device. This connector is generally used for
communication with the system and power management-related
tasks.
COM
PIN 1
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS
PIN 1
GND GND O_COM1_TXD1
SOUTC_P80
+3V
COM_DEBUG
AAFP
AGND NC SENSE1_RETUR SENSE2_RETUR
PORT1 L
PORT1 R PORT2 R
SENSE_SEND
PORT2 L
HD-audio-compliant
pin definition
PIN 1
O_LPT_XSTB#_R
O_LPT_XPD0_R O_LPT_XPD1_R O_LPT_XPD2_R O_LPT_XPD3_R O_LPT_XPD4_R O_LPT_XPD5_R O_LPT_XPD6_R O_LPT_XPD7_R O_LPT_ACK#_R
O_LPT_BUSY_R
O_LPT_PE_R
O_LPT_SLCT_R
O_LPT_XAFD#_R O_LPT_ERROR#_R O_LPT_XINIT#_R O_LPT_XSLIN#_R GND GND GND GND GND GND GND GND
SMBUS
SMBUS_CLK
GND
SMBUS_DATA
PIN 1
R_OUT-
R_OUT+
PIN 1
MONO-OUT
Chapter 1: Product Introduction