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ASUS P4T-EM User’s Manual 37
3. HARDWARE SETUP
Connectors
3. H/W SETUP
®
P4T-EM
P4T-EM HDD Activity LED
TIP: If the case-mounted LED does not
light, try reversing the 2-pin plug.
HDDLED
16) IDE Activity LED (2-pin HDLED)
This connector supplies power to the cabinet’s IDE activity LED. Read and
write activity by devices connected to the Primary/Secondary IDE and Primary/
Secondary ATA100 connectors will cause the LED to light up.
17) SMB Connector (5-1 pin SMB)
This connector allows you to connect SMBus (System Management Bus) de-
vices. SMBus devices communicate by means of the SMBus with an SMBus
host and/or other SMBus devices. SMBus is a specific implementation of an
I2C bus, which is a multi-device bus; that is, multiple chips can be connected to
the same bus and each one can act as a master by initiating data transfer.
®
P4T-EM
P4T-EM SMBus Connector
SMB
1
SMBCLK
Ground
SMBDATA
+3V
FLOATING