Does anyone know how to use the UART connection on the UP Xtreme i11?

The User's Manual for the i11 shows a UART connection on CN11. up_xtreme_i11_upx-tgl01_manual_1st_ed_0615_1.pdf, section 2.3.9.

Pins 8, 9 and 10 of that connector are GND, UART_TX and UART_RX.

But I can't find out much about that connection. Is it a standard serial port I can use? Do I need a level shifter in order to connect it to an RS232 device, and if so is it 3.3V or 5V?

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