APEX ORIN NX II RS232 Interface

Hardware Specifications

DB9 Pin Definition for the UART Interface:

Pin Definition

Pin	Signal
2	RX
3	TX
5	GND

Relationship between Functions and Device Nodes

Function	Overview	Device Node
UART(232)A	RS232 A	/dev/ttyUART_232_A
UART(232)B	RS232 B	/dev/ttyUART_232_B
UART(232)C	RS232 C	/dev/ttyUART_232_C
UART(232)D	RS232 D	/dev/ttyUART_232_D

Usage

• Connect connector 1 to the device’s RS232 connector

• Connect connector 2 to the PC

Preparation

PC (Ubuntu)

# Install
sudo apt-get install putty -y

Device

# Install
sudo apt-get install putty -y

Transmit and Receive Verification

Device

# Open PuTTY
sudo putty

In PuTTY, configure “Session”: enter the connected device node in “Serial line”, set “Speed” to 115200, and select “Serial” under “Connection type”.

Under “Terminal”, select “Force on” in “Line discipline options”, then click “Open” to enter the data transfer window.

PC

Obtain the UART Device Node on the PC

# After connecting the USB-to-serial module to the PC, run the following command to obtain the UART device node:
ls /dev | grep -E 'ttyUSB[0-9]+' | sort -V | tail -n 1

# Open PuTTY
sudo putty

In PuTTY, configure “Session”: enter the connected device node in “Serial line”, set “Speed” to 115200, and select “Serial” under “Connection type”.

Under “Terminal”, select “Force on” in “Line discipline options”, then click “Open” to enter the data transfer window.

Use PuTTY to Verify Transmission and Reception

Observe the data transfer windows on the device and PC. Enter text in either window. If both windows display the same text, transmission and reception are successful.

PC Display

Device Display