User manual

Installation Instructions
- 16 - EC3-1816CLD2NA
2.14 GPIO Port
Pin Signal Pin Signal
1 GPIO1 2 GPIO5
3 GPIO2 4 GPIO6
5 GPIO3 6 GPIO7
7 GPIO4 8 GPIO8
GPIO1
(Pitch: 2.0mm)
9 GND 10 NC
Note: By the factory default, the pin 1, 3, 5 and 7 of the connector are TTL
input while pin 2, 4, 6, and 8 are CMOS output. The factory default state is
high level and the voltage range for input/output signal is 0-5V.
2.15 Fan Connector
The motherboard provides one 1×4Pin CPU fan connector (CPUFAN1, pitch:
2.54mm). When using the fan connector, please pay attention to the following two
issues:
 The current for the fan should be no more than 500mA (12v).
 Please confirm that the fan cable complies with the socket cable. Power
cable (usually red) is in the middle. In addition, please confirm the
position of earth cable (usually black) and fan speed output pulse signal
cable (other colors). Some fans have no speed detection while the output
of the cable is up to 12V. These substandard connection will damage the
CPU card. It is recommended to use a fan with speed detection.
 Adjust the fan’s airflow to the direction of heat venting.
Pin Signal
1 GND
2 +12V
3 FAN_IO
CPUFAN1
4 FAN_PWM
FAN_IO: fan speed pulse output; FAN_PWM: fan speed PWM control.