Asus KNPA-U16, User Manual

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2-24 Chapter 2: Hardware Information
3. USB 3.0 connector (20-1 pin USB3_34; 4-pin Type-A USB3_4)
The 20-1 pin connector allows you to connect a USB 3.0 module for additional USB 3.0
front or rear panel ports. The 4-pin USB (Universal Serial Bus) Type-A port is available
for connecting USB 3.0 devices.
4. Serial port connector (10-1 pin COM1)
This connector is for the serial COM port. Connect the serial port module cable to one
of these connectors, then install the module to a slot opening at the back of the system
chassis.
The COM module is purchased separately.