Asus TS300-E6/PS4 - Manual (Page 65)

ASUS TS300-E6/PS4 4-11
5. Serial port connector (10-1 pin COM2)
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.
6. CPU, front and rear fan connectors
(4-pin CPU_FAN1, FRNT_FAN1–3, REAR_FAN1)
The fan connectors support cooling fans of 350 mA–740 mA (8.88 W max.)
or a total of 1.75 A–3.7 A (44.4 W max.) at +12V. Connect the fan cables to
the fan connectors on the motherboard, ensuring that the black wire of each
cable matches the ground pin of the connector.
• DO NOT forget to connect the fan cables to the fan connectors. Insufficient
air flow inside the system may damage the motherboard components.
• These are not jumpers! DO NOT place jumper caps on the fan connectors!
• All fans feature the ASUS Smart Fan technology.