Asus PR-DLS PR-DLS User Manual - Page 45
ASUS PR-DLS motherboard user guide, Chassis alarm lead 4-1 pin CHASSIS, SMBus connector 6-1 pin SMB
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4. Chassis alarm lead (4-1 pin CHASSIS) This lead is for a chassis designed with intrusion detection feature. This requires an external detection mechanism such as a chassis intrusion sensor or microswitch. When you remove any chassis component, the sensor triggers and sends a high-level signal to this lead to record a chassis intrusion event. By default, the pins labeled "Chassis Signal" and "Ground" are shorted with a jumper cap. If you wish to use the chassis intrusion detection feature, remove the jumper cap from the pins. CHASSIS +5Volt (Power Supply Stand By) Chassis Signal Ground PR-DLS PR-DLS Chassis Open Alarm Lead 5. SMBus connector (6-1 pin SMB) This connector allows you to connect SMBus (System Management Bus) devices. Devices communicate with an SMBus host and/or other SMBus devices using the SMBus interface. SMBus is a specific implementation of an I2C bus, a multi-device bus that allows multiple chips to connect to the same bus and enable each one to act as a master by initiating data transfer. PR-DLS PR-DLS SMBus Connectors +5V SMBDATA Ground SMBCLK FLOATING SMB 1 ASUS PR-DLS motherboard user guide 2-19