i connected both method to ld06 RS232-USB(Jetson Nano ttyUSB0 ) Module and ld06 uart - Jetson Nano uart (ttyTHS1) connection.

same error message appears for both usb connection and uart connection.
Error message below.

how can i solve this problem?

roslaunch ldlidar_ros ld06.launch

... logging to /home/nvidia/.ros/log/7e779752-afa3-11ee-a1d6-48b02d821810/roslaunch-hexa-nano-ros-20192.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://hexa-nano-ros:44365/

SUMMARY

PARAMETERS

• /ldlidar_publisher_ld06/angle_crop_max: 225.0
• /ldlidar_publisher_ld06/angle_crop_min: 135.0
• /ldlidar_publisher_ld06/enable_angle_crop_func: False
• /ldlidar_publisher_ld06/frame_id: base_laser
• /ldlidar_publisher_ld06/laser_scan_dir: True
• /ldlidar_publisher_ld06/laser_scan_topic_name: scan
• /ldlidar_publisher_ld06/point_cloud_2d_topic_name: pointcloud2d
• /ldlidar_publisher_ld06/port_name: /dev/ttyTHS1
• /ldlidar_publisher_ld06/product_name: LDLiDAR_LD06
• /ldlidar_publisher_ld06/range_max: 12.0
• /ldlidar_publisher_ld06/range_min: 0.02
• /ldlidar_publisher_ld06/serial_baudrate: 230400
• /rosdistro: melodic
• /rosversion: 1.14.13

NODES
/
base_to_laser_ld06 (tf/static_transform_publisher)
ldlidar_publisher_ld06 (ldlidar_ros/ldlidar_ros_node)

auto-starting new master
process[master]: started with pid [20206]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 7e779752-afa3-11ee-a1d6-48b02d821810
process[rosout-1]: started with pid [20219]
started core service [/rosout]
process[ldlidar_publisher_ld06-2]: started with pid [20235]
process[base_to_laser_ld06-3]: started with pid [20237]
[ INFO] [1704882726.051915654]: LDLiDAR SDK Pack Version is:3.3.1
[ INFO] [1704882726.055409137]: ROS param input:
[ INFO] [1704882726.055477524]: <product_name>: LDLiDAR_LD06
[ INFO] [1704882726.055527004]: <laser_scan_topic_name>: scan
[ INFO] [1704882726.055641068]: <point_cloud_2d_topic_name>: pointcloud2d
[ INFO] [1704882726.055695391]: <frame_id>: base_laser
[ INFO] [1704882726.055787580]: <port_name>: /dev/ttyTHS1
[ INFO] [1704882726.055837945]: <serial_baudrate>: 230400
[ INFO] [1704882726.055882581]: <laser_scan_dir>: Counterclockwise
[ INFO] [1704882726.055927009]: <enable_angle_crop_func>: false
[ INFO] [1704882726.055978885]: <angle_crop_min>: 135.000000
[ INFO] [1704882726.056026385]: <angle_crop_max>: 225.000000
[ INFO] [1704882726.056171127]: <range_min>: 0.020000
[ INFO] [1704882726.056231648]: <range_max>: 12.000000
[ INFO] [1704882726.056482537]: ldlidar serial connect is success
[ERROR] [1704882729.557566205]: ldlidar communication is abnormal.
[ldlidar_publisher_ld06-2] process has died [pid 20235, exit code 1, cmd /home/nvidia/catkin_ws/devel/lib/ldlidar_ros/ldlidar_ros_node __name:=ldlidar_publisher_ld06 __log:=/home/nvidia/.ros/log/7e779752-afa3-11ee-a1d6-48b02d821810/ldlidar_publisher_ld06-2.log].
log file: /home/nvidia/.ros/log/7e779752-afa3-11ee-a1d6-48b02d821810/ldlidar_publisher_ld06-2*.log