User`s manual

AIMB-740-B/741-B User’s Manual 6
Table 1.2: Connectors
Label
Function
CN1 Primary IDE connector
CN2 Secondary IDE connector
CN3 Floppy drive connector
CN4 Parallel port
CN6 USB port 4, 5
CN7 VGA connector (only for AIMB-740-
6CB1)
CN9 Serial port: COM1
CN10 Serial port connector: COM2
CN10 Serial port connector: COM2 (RS 232/
422/485)
CN23 Serial port connector: COM3 (RS 232)
CN26 Serial port connector: COM4 (RS 232
CN67 Serial port connector: COM5 (RS 232)
CN70 Serial port connector: COM6 (RS 232/
422/285)
CN11 PS/2 keyboard and mouse connector
CN12 External keyboard connector
CN14 CPU FAN connector
CN15 System FAN connector 1
CN16 Power LED and Keyboard Lock
CN17 External speaker
CN18 Reset connector
CN19 HDD LED connector
CN21 ATX soft power switch (PS_ON)
CN22 HW Monitor Alarm
Close: Enable OBS Alarm
Open: Disable OBS Alarm
CN29 SM BUS Connector
PIN1: SMB_DATA
PIN2: SMB_CLOCK