Asus WS C422 SAGE/10G Manual page 37

11. Thermal sensor connector (2-pin T_SENSOR)
This connector is for the thermistor cable that monitors the temperature of the devices
and the critical components inside the motherboard. Connect the thermistor cable
and place the sensor on the device or the motherboard's component to detect its
temperature.
The thermal sensor is purchased separately.
12. Serial port connector (10-1 pin COM1)
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.
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