Pixhawk connection problem with Jetson Nano: "MAV> link 1 down" output

[m.tugra32]

Hello everyone!
I’ve been trying to connect a pixhawk to Jetson Nano. I followed the steps on this site: Connecting PixHawk to Raspberry Pi and NVIDIA Jetson - Hackster.io
I connected gnd, rx and tx cables to telemetry 2 port properly and downloaded the necessary libraries.
After that, I typed the following command:
sudo mavproxy.py --master=/dev/ttyTHS1

And I got this output:
Connect /dev/ttyTHS1 source_system=255
Log Directory:
Telemetry log: mav.tlog
Waiting for heartbeat from /dev/ttyTHS1
MAV> link 1 down

How can I solve this problem?

[DaneLLL]

Hi,
We don’t know about the device and please share more information. Which interface is connected with the device? Uart or CSI?

[m.tugra32]

Uart interface is connected

[DaneLLL]

Hi,
Please try this:
Unit nvgetty.service not loaded - #3 by JerryChang

And disable nvgetty for a try:
RS485(/dev/ttyTHS0) lose packet when reboot and first receive data - #3 by JerryChang