Asus P7F-C/SAS - Manual (Page 49)

ASUS P7F-C Series 2-31
10. Thermal sensor cable connectors (3-pin TR1)
This connector is for temperature monitoring. Connect the thermal sensor
cable to this connector and place the other end to the device, which you want
to monitor temperature.
11. Parallel port connector (26-1 pin LPT1)
This connector is for a parallel port. Connect the parallel port module cable
to this connector, then install the module to a slot opening at the back of the
system chassis.