Hardware Function Usage

Debug Serial Port

The EC-R3399PC computer does not expose a debug serial port. You need to open the enclosure to access the debug serial port on the ROC-RK3399-PC motherboard, and connect a USB to TTL serial adapter for debugging. The serial port parameters are: baud rate 1500000, 8 data bits, 1 stop bit, no parity, no flow control.

For the connection and usage of the debug serial port, please refer to: Debug Serial Port.

Display Interfaces

The EC-R3399PC provides two display output interfaces and supports dual-display:

• HDMI 2.0: 4K@60fps output.
• DP 1.2: output through the USB-C interface, up to 4K@60fps.

For dual-display, the combination of 1 x USB-C (2K output) + 1 x HDMI (4K output) is supported, which can be configured in the display settings of the system.

Ethernet

The EC-R3399PC provides 1 RJ45 Gigabit Ethernet port, which is recognized as the eth0 device in the system.

After the Ethernet port is connected to the network, you can check the IP address via the debug serial port or adb:

ifconfig eth0

Connectivity test:

ping -I eth0 -c 10 www.baidu.com

USB Interfaces

The EC-R3399PC provides the following USB interfaces:

• 1 x USB3.0 (current limit 1A)
• 1 x USB2.0 (current limit 500mA)
• 1 x USB-C multi-function interface (USB3.0 OTG data transfer, DP1.2 video output). In OTG mode it is mainly used to connect to a host computer for firmware flashing

Storage

The EC-R3399PC provides the following storage expansions:

• TF Card: the TF card slot on the panel supports TF card storage expansion. Please power off the device before inserting or removing the card.
• NVMe SSD: the motherboard inside provides 1 x PCIe2.1 (2 Lanes), expandable with a 2242 NVMe SSD, which needs to be installed after opening the enclosure. After installation, the SSD can be formatted and mounted in the system:

mkfs.ext4 /dev/nvme0n1
mount /dev/nvme0n1 /mnt/
df -h

Audio

The EC-R3399PC provides a 3.5mm audio jack with MIC recording support. In addition, HDMI audio output and DP1.2 audio output (through the USB-C interface) are supported.

IR and Buttons

The EC-R3399PC supports the IR remote control function. There are 1 Power button and 1 Recovery button (at the end of the audio jack) on the panel.