Technical Reference 
41 
2.2.2.1  Signal Tables for the Connectors and Headers 
 
 
Table 12.  Serial Port Header 
Pin  Signal Name  Pin  Signal Name 
1  DCD (Data Carrier Detect)  2  RXD# (Receive Data) 
3  TXD# (Transmit Data)  4  DTR (Data Terminal Ready) 
5  Ground  6  DSR (Data Set Ready) 
7  RTS (Request To Send)  8  CTS (Clear To Send) 
9  RI (Ring Indicator)  10  Key (no pin) 
 
 
Table 13.  Front Panel Audio Header for Intel HD Audio 
Pin  Signal Name  Pin  Signal Name 
1  [Port 1] Left channel  2  Ground 
3  [Port 1] Right channel  4  PRESENCE# (Dongle present) 
5  [Port 2] Right channel  6  [Port 1] SENSE_RETURN 
7  SENSE_SEND (Jack detection)  8  Key (no pin) 
9  [Port 2] Left channel  10  [Port 2] SENSE_RETURN 
 
 
Table 14.  Front Panel Audio Header for AC ’97 Audio  
Pin  Signal Name  Pin  Signal Name 
1   MIC  2  AUD_GND 
3  MIC_BIAS  4  AUD_GND 
5  FP_OUT_R  6  FP_RETURN_R 
7  AUD_5V  8  KEY (no pin) 
9  FP_OUT_L  10  FP_RETURN_L 
 
NOTE 
Not all AC ’97 signals are supported; specifically, pins 4, 6, 7, and 10 are not 
supported. 
 
 
Table 15.  Front Panel USB Header  
Pin  Signal Name  Pin  Signal Name 
1   +5 VDC  2  +5 VDC 
3  D-  4  D- 
5  D+  6  D+ 
7  Ground  8  Ground 
9  KEY (no pin)  10  No Connect