Asus B75M-PLUS B75M-PLUS User's Manual - Page 28
B75M-PLUS Digital audio connector, B75M-PLUS Serial port COM connector
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RXD DTR DSR CTS DCD TXD GND RTS RI 10. Serial port connector (10-1 pin COM) This connector is for a serial (COM) port. Connect the serial port module cable to this connector, then install the module to a slot opening at the back of the system chassis. COM PIN 1 B75M-PLUS B75M-PLUS Serial port (COM) connector The COM module is purchased separately. 11. Digital audio connector (4-1 pin SPDIF_OUT) This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. Connect the S/PDIF Out module cable to this connector, then install the module to a slot opening at the back of the system chassis. B75M-PLUS SPDIF_OUT B75M-PLUS Digital audio connector The S/PDIF module is purchased separately. +5V SPDIFOUT GND 1-20 Chapter 1: Product introduction