Asus Pro B660M-C D4-CSM Pro B660M-C D4 Users Manual English - Page 12

RXD DTR DSR CTS 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. COM PIN 1 DCD TXD GND RTS RI 14. COM Debug header This header allows connection to a COM Debug card. The COM Debug Card is purchased separately. COM_DEBUG GND GND O_COM1_TXD1 PIN 1 SOUTC_P80 +3V AGND NC SENSE1_RETUR SENSE2_RETUR 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-definition front panel audio module to this header to avail of the motherboard's highdefinition audio capability. AAFP PORT1 L PORT1 R PORT2 R SENSE_SEND PORT2 L • If you want to connect a high-definition 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]. HD-audio-compliant pin definition O_LPT_XAFD#_R O_LPT_ERROR#_R O_LPT_XINIT#_R O_LPT_XSLIN#_R GND GND GND GND GND GND GND GND 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. 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 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 MONO-OUT This internal Mono-out header allows connection to an internal, low power PIN 1 speaker for basic system sound capability. The subsystem is capable of driving a speaker load of 3 Watts RMS at 4 Ohms. R_OUTR_OUT+ 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. SMBUS SMBUS_CLK GND SMBUS_DATA PIN 1 1-4 Chapter 1: Product Introduction