Kontron KTA75-FLEX - Manual (Page 39)

KTD-N0861-B Page 31 Pin Connectors
KTA75/Flex Users Guide
KTA70M/mITX Users Guide
7.10 CPU/System Fan Connectors (J25, J24)
The CPU Fan connector and the System Fan connector are identical 4 pin type connectors. The type is Tyco
1470947-1 or similar.
Header Pin Signal Description Type
1 PWM PWM output O-3.3
2 TACHO Tacho signal (open drain) I
3 12V Power +12V PWR
4 GND Ground PWR
Signal Description
PWM PWM is output signal used to control the fan speed (only for 4-wire Fans).
Tacho
Tarcho input signal is used to monitor the rotation speed RPM (Rotation Per Minute).
Prepared for two pulses per turn.