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COM3 & COM4 Power Setting
COM3 and COM4 can be set to provide power to your serial device.
The voltage can be set to +5V or 12V by setting jumper JP9 on the motherboard.
When enabled, the power is available on pin 10 of the RJ45 serial connector.
If you use the serial RJ45 to DB9 adapter cable, the power is on pin 9 of the DB9
connector. By default, the power option is disabled in the BIOS.
Enable COM3/COM4 power in BIOS
1. Power on the system, and press
the <DEL> key when the system
is booting up to enter the BIOS
Setup utility.
2. Select the Advanced tab
3. Select Power Configuration
COM/VGA Ports and press
<Enter> to go to display the
available options.
4. To enable the power, select
COM3 Power Setting or COM4
Power setting and press
<Enter>. Select Power and
press <Enter>.
Save the change by pressing
F10.
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