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The voltages that can be drawn are outlined in the following table. It is
recommended not to draw more than 1 A per power pin.
Pin
1
2
3
4
Dip switch
The dip switch allows you to:
• Configure the power-on function.
• Configure the bottom (external) serial port to the RS-485 standard.
• Activate resistor termination (for a multidrop network).
• Configure the fan speed.
The specifications for the dip switch are outlined in the following table.
Switch
ON
1
Automatic power-on.
2
Bottom serial port set to
RS-485 standard.
3
120-Ohm resistor termination activated, to
eliminate signal distortion in multidrop networks.
4
Fan at full speed.
Pinout descriptions of internal connectors and dip switch
Voltage
5 V
Ground
Ground
12 V
off
on
1
2
3
4
OFF
Manual power-on (push button).
Bottom serial port set to
RS-232 standard.
No resistor termination activated.
Fan in automatic mode.
189
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