CUAV LTE-LINK se User manual

LTE-LINK SE
User's Guide
v2.0.0
CUAV TECH INC.,LTD

LTE-LINK SE user's Guide
I
目录
1 Overview...................................................................................................................................... 1
1.1 Product Features................................................................................................................ 1
1.2 Main purpose and scope of application............................................................................. 2
1.3 Safety................................................................................................................................. 2
2 Technical characteristics............................................................................................................... 3
2.1 The main function..............................................................................................................3
2.2 The main parameters...................................................................................................... 3-4
3 Product appearance and interface description.............................................................................. 5
3.1 Product appearance............................................................................................................5
3.2 Product hardware and interface description...................................................................... 5
3.2.1 Hardware interface diagram................................................................................... 5
3.2.2 Hardware and interface description........................................................................ 6
3.2.3 Wiring instructions................................................................................................. 7
4 Hardware installation and debugging........................................................................................... 8
4.1 Device connection diagram............................................................................................... 8
4.2 Interface debugging........................................................................................................... 8
4.2.1 Prepare to work.......................................................................................................8
4.2.2 Data transmission interface debugging...................................................................9
4.2.3 HDMI interface debugging..............................................................................10-11
4.2.4 TF memory card interface debugging...................................................................12
4.2.5 SIM card access and network service connection debugging.............................. 13
5 Use and operation....................................................................................................................... 14
5.1 Preparation before use..................................................................................................... 14
5.2 Boot interface and system version information............................................................... 14
5.3 CUAV cloud server connection....................................................................................... 15
5.3.1 Effective SIM card insertion detection................................................................. 15
5.3.2 Register SIM card network...................................................................................15

LTE-LINK SE user's Guide
II
5.3.3 Connect to the public network..............................................................................16
5.3.4 Public network connection is successful.............................................................. 16
5.3.5 Synchronize network time to device.................................................................... 16
5.3.6 Request to connect to CUAV Cloud Server..........................................................17
5.3.7 Successfully connected to the server.................................................................... 17
5.4 Device binding and unbinding.........................................................................................18
5.4.1 Device binding................................................................................................ 18-19
5.4.2 Device unbinding..................................................................................................20
5.5 Digital transmission.........................................................................................................20
5.6 Image Transmission.........................................................................................................20
5.7 Video................................................................................................................................22
5.7.1 Premise demand....................................................................................................22
5.7.2 Video mode...........................................................................................................23
5.7.3 Several restrictions on recording.......................................................................... 24
5.7.4 TF memory card overflow handling..................................................................... 25
5.8 Taking photos...................................................................................................................24
5.9 System version upgrade...................................................................................................26
5.9.1 Online upgrade..................................................................................................... 26
5.9.2 Offline upgrade.....................................................................................................27
5.10 System version configuration restore............................................................................ 28
5.11 Attention points when equipment use............................................................................28
6 Failure analysis and troubleshooting.......................................................................................... 29
6.1 Network and server connection..................................................................................29-30
6.2 Status message indication information list...................................................................... 31
6.2.1 Upgrade function message prompt list................................................................. 31
6.2.2 Device network detection message prompt list.................................................... 31
6.2.3 External device function message prompt list...................................................... 32
6.2.4 Device management control message prompt list................................................ 33
6.3 Other abnormalities......................................................................................................... 34

LTE-LINK SE user's Guide
III

LTE-LINK SE user's Guide
1
1 Overview
LTE-LINK SE is a multifunctional link system suitable for open source flight control
equipment and camera video data acquisition and transmission. The system works in a 4G
network environment and is used with the CUAV cloud platform APP to realize open source
flight control equipment and camera video Unlimited distance transmission of data. The system
uses 12V ~ 55V DC power supply as power, and a wide range of working voltage is compatible
with the power supply system of most drones on the market.
In terms of system upgrade and update, the product can upgrade the system version of the
device to the latest version officially released by CUAV Cloud, allowing users to use the system
upgrade to bring more convenient and complete functions, while also being able to experience
the latest open source flight control protocol technology. In terms of product maintenance and
processing, the system provides the function of restoring the system. If the current system is
abnormal, the user can use this function to restore the system.
The system adopts OLED display, complete status information indication, simple operation,
running status stable and reliable, it is a link device that successfully solves the open source
flight control infinite distance control and the infinite distance collection and transmission of
camera video data.
1.1 Product Feature
Efficient 32-bit ARM processor
SIM card compatible with multiple operators
Unlimited distance data transmission, the data is processed by the ChaCha20-Poly1305
encryption algorithm
Support multi-platform cloud management
Provide remote online upgrade and offline upgrade of equipment

LTE-LINK SE user's Guide
2
1.2 Main purpose and scope of application
Drone flight control
Automatic cruise equipment (such as automatic cruise car, automatic cruise yacht)
Unlimited distance camera monitoring equipment
1.3 Safety
The device power cord and flight control data transmission line should use the interface
line matched by the product to avoid chip damage.
When the device is working in an environment with poor heat dissipation for a long
time, do not touch the device directly with your hands. You should disconnect the
power supply and wait for the surface temperature of the device to drop before
removing it.

LTE-LINK SE user's Guide
3
2 Technical characteristics
2.1 The main function
Flight control data transmission control
Real-time viewing of camera video data
Video
Taking photos
2.2 The main parameters
Form 2- 1 Overall performance parameter list
CPU
HiSilicon Hi3516DV100
Network card
ME909S(821a)
Network
frequency
band
LTE(FDD): B1、B3、B8
LTE(TDD): B38、B39、B40,B41
DC-HSPA+/HSPA+/HSPA/UMTS: B1、B9、B5、B8、B9
TD-SCDMA: B34, B39
EDGE/GPRS/GSM: 900/1800MHz
Flight control
type
CUAV series、Pixhawk series and so on.
Data protocol
MAVLink1、MAVLink2
Transmission
distance
There is no limit in theory, depending on network coverage
Video input
1080P、720P
Video
encoding
H265
Network
expansion
No support
Cloud video
No support

LTE-LINK SE user's Guide
4
storage
Video
recording
Active recording, automatic recording (automatic mode needs to be specified
by the user on the client-side)
Form 2- 2 Interface parameter list
data input
UART
Video input
HDMI
Antenna
interface
MMCX
Device screen
OLED 128*64 Pixel
Client-side
FeiGong transmission: Windows 7 and above
CUAV GS：Android 7.0 and above
For other third-party client-side, the data provided by the third party shall
prevail.
Form 2- 3 Working environment and physical parameter list
Operating
Voltage
12V ~ 55V
Operating
temperature
-10℃ ~ +60℃
Size
75.3mm 39.2mm 19mm
Weight
78g

LTE-LINK SE user's Guide
5
3 Product appearance and interface description
3.1 Product appearance
LTE-LINK SE product appearance shown as Figure 3-1.
Figure 3- 1 LTE-LINK SE product appearance
3.2 Product hardware and interface description
3.2.1 Hardware interface diagram
The product hardware interface is shown in Figure 3-2, Figure 3-3.
OLED display screen
SIM card slot
Power status light
System status light
NIC status light
Power connector
Data transmission
interface.
Button
Figure 3- 2

LTE-LINK SE user's Guide
6
HDMI video input
Fan machine
Antenna ANT1
Antenna ANT2
TF memory card
Figure 3- 3
3.2.2 Hardware and interface description
OLED display screen：Display LTE-LINK SE system status information.
SIM card slot：Used to access the SIM card.
Power status light：Indicates the current power supply situation of the device. If the
indicator is found to be off after power-on, it indicates that the power supply of the
device is abnormal.
System status light：When system normal operation indicator and the system is in
normal operation state, the indicator flashes at a frequency of 1s.
NIC status light：Indicates the current network status of the 4G network card. When it
flashes twice continuously within 1s, it means that the current network card is not
inserted into the SIM card or the inserted SIM card cannot connect to the network
service; when it flashes once within 1s, it means the current network card has been
inserted to the SIM card which is capable of connecting to the network ; when it is
always on, it indicates that the network card has successfully dialed in and the device
can use network services through the 4G network.
Power connector：Power supply for equipment.
Button：Used for account device binding, device CID QR code display and device
system restoration.

LTE-LINK SE user's Guide
7
Data transmission：Connect to external flight control equipment.
HDMI video input：Camera HDMI interface.
Fan machine：External fan power supply interface, which can supply power for
external cooling fan.
Antenna ANT1： The main interface of the network card network signal antenna, which
must be connected to the antenna when used.
Antenna ANT2：Network card network signal antenna secondary interface, increase
the stability of the network card network receiving signal.
TF memory card：Support external TF memory card for saving video recording files,
saving photo files and restoring the system offline.
3.2.3 Wiring instructions
The power cord is shown as Figure 3-4.
Figure 3- 4
The data transmission interface line is shown as Figure 3-5.
Figure 3- 5
The antenna and its extension cable are shown as Figure 3-6.
Figure 3- 6
The HDMI video data acquisition transmission line is shown as Figure 3-7.
Figure 3- 7

LTE-LINK SE user's Guide
8
4 Hardware installation and debugging
4.1 Device connection diagram
The user can connect the device interface line according to the product appearance
description in Chapter 3 to match the wiring instructions.
4.2 Interface operation
4.2.1 Prepare to work
Before debugging the device interface, check the voltage of the power supply device
currently pre-supplying the device to ensure that the voltage value is between 12V and 55V.
After connecting the power, check whether the OLED screen has a boot interface display. For
example, when the OLED screen is not displaying, then check the power indicator status on the
LTE-LINK SE. If the power indicator is on but the screen does not display, it is scheduled to be
an OLED screen problem. On the contrary, it is the power supply problem of the equipment
power supply. After the device is powered on, the OLED screen display interface is shown as
Figure 4-1.
Figure 4- 1 Initial detection interface
After the device is powered on, after the system displays the Logo and device system
version information finished, the OLED display enters the main display interface, as shown as
Figure 4-2.

LTE-LINK SE user's Guide
9
Figure 4- 2 Main menu interface
4.2.2 Data transmission interface debugging
When the data transmission interface of the LTE-LINK SE device is not connected to the
flight control device, it will be indicated by the icon marked as Figure 4-3. When the data
transmission interface of the device is connected to the flight control device, if the data
transmission interface of the device is normal, the data transmission connection icon indicator on
the screen interface will be displayed as shown in Figure 4-4. On the contrary, when the
connection is abnormal, the data transmission connection icon display status will not change.
When it is judged that the flight control data transmission connection is abnormal, it may be
caused by several reasons listed below. When users or maintenance personnel encounter such
problems, You can check and repair the equipment according to this list：
The end of the interface cable is loose or disconnected
The data transmission interface of LTE-LINK SE equipment is damaged
The data transmission interface of the flight control device is damaged
The connected flight control device is not a device of MAVLink protocol
The interface cable used does not match the connected flight control device
Figure 4- 3 Flight controller not connected

LTE-LINK SE user's Guide
10
Figure 4- 4 Flight controller connected
Note：The line sequence of the data transmission interface cable connected to the
LTE-LINK SE device is fixed and cannot be changed. When connecting the flight control data
transmission device, you need to modify it according to the interface line sequence of the
connected device. For example, there will be three USB cables when the product is sold. The
flight control data cable corresponds to the data transmission interface of the V5/V5 nano,
V3/V2, Pixhawk series devices, so this problem should not be ignored when troubleshooting.
4.2.3 HDMI interface debugging
The connection identification of the HDMI interface is shown as Figure 4-5. The
identification status of the icon in the figure is that there is no camera connected.
Figure 4- 5 HDMI not connected to the device status
If it is detected that a normal HDMI camera device is connected, the icon indication on the
screen interface will indicate the status as shown as Figure 4-6.

LTE-LINK SE user's Guide
11
Figure 4- 6 HDMI connected to the device status
For the HDMI input part, the status information prompt area of the LTE-LINK SE device
screen has corresponding status information display. When the screen icon does not change to
the HDMI connection status after the HDMI camera device is connected, the user needs to
troubleshoot the problem according to the screen status information prompt area displays content.
HDMI status related information prompts and causes are as follows：
1) < HDMI instability > and < h*v Nonsupport >
h and v indicate the HDMI input resolution actually detected by the link device. The
reasons for this problem are as follows：
HDMI cable problem
HDMI interface poor contact
The output resolution of the camera device connected to the HDMI cable is not
supported by the LTE-LINK SE device HDMI, the abnormal state is shown in
Figure 4-7.
Figure 4- 7 HDMI not connected to the device status
2) < Video Chip Error >
The screen prompts this status message, indicating that the HDMI video capture chip of
the current device is abnormal. When this problem occurs, the device needs to be
returned to the factory for repair. The state diagram is shown in Figure 4-8.

LTE-LINK SE user's Guide
12
Figure 4- 8Video capture chip abnormal
4.2.4 TF memory card interface debugging
The LTE-LINK SE device supports external storage device TF memory card function . The
external TF memory card is mainly used for the storage of the user's video files and
photographed photo files. If the user needs the video or photograph function,It is necessary to
debug the access status of the TF memory card during installation.
There is a TF memory card access status indicator icon on the main interface of the
LTE-LINK SE device screen,shown as Figure 4-9 means the device does not detect the TF
memory card access,When it is detected that a TF memory card is connected, the indicator icon
will be shown as Figure 4-10.
Figure 4- 9 TF card not connected
Figure 4- 10 TF card connected

LTE-LINK SE user's Guide
13
4.2.5 SIM card access and network service connection debugging
The LTE-LINK SE device does not support hot swapping of the SIM card, so please insert
the SIM card into the SIM card slot and connect two antennas at the same time before powering
on the device. After the device is powered on, it needs to judge whether the connected SIM card
is valid according to the indication status of the network card status light (LTE).
When the network card status light quick flashes twice continuously at a frequency of
1s, it means that the SIM card is not inserted or the inserted SIM cannot be connected
to the network through the LTE-LINK SE device.
When the network status light flashes once at a frequency of 1s, it means that the SIM
card has been inserted and the LTE-LINK SE device can connect to the network.
For the position of the NIC status light shown as Figure 3-2.

LTE-LINK SE user's Guide
14
5 Use and operation
5.1 Preparation before use
Before using the LTE-LINK SE device, please debug the various interfaces of the device
according to the description in Chapter 4,the preparation of the LTE-LINK SE equipment is
completed when the interface debugging is normal.
5.2 Boot interface and system version information
When the LTE-LINK SE device is powered on and the screen is normal, it will first display
the screen detection interface as shown in Figure 4-1. After the detection interface finish
displayed, the product company logo will be displayed shown as Figure 5-1.After the Logo is
displayed for about 3 seconds, the currently running system version number of the device will be
displayed,different versions of memory and troubleshooting methods will be different,When
using this document to troubleshoot problems, users need to confirm the consistency of the
version. The device version display is shown as Figure 5-2
Figure 5- 1 Logo
Figure 5- 2 System version

LTE-LINK SE user's Guide
15
5.3 CUAV cloud server connection
After the LTE-LINK SE device starts to the main interface, the device will automatically try
to connect to the CUAV cloud server. Generally speaking, according to the description in section
4.2.5, after the user inserts the SIM card for debugging, the device can be connected to the
CUAV cloud server normally.
5.3.1 Effective SIM card insertion detection
The device detects whether there is a valid SIM card currently connected, at the same time
the screen interface displays the "sim check …" status message, shown as Figure 5-3.
Figure 5- 3 Detecting SIM
5.3.2 Register SIM card network
After the SIM card has passed the detects, the device will register the SIM card network
status, and the status message on the screen interface will change from "sim check …" to "sim
net register", shown as Figure 5-4.
Figure 5- 4 Register SIM public network

LTE-LINK SE user's Guide
16
5.3.3 Connect to the public network
After the SIM card network registration is successful, the LTE-LINK SE network card
device starts to request to connect to the public network, and the status message on the screen
interface changes from "sim net register" to "lte net start …", shown as Figure 5-5.
Figure 5- 5 4G network connection request
5.3.4 Public network connection is successful
After the device is successfully connected to the public network, the status message on the
screen interface will change from "lte net start …" to "lte net OK".At the same time, the 4G
signal strength indicator area on the screen starts to display the current 4G signal strength value
of the device in real time, shown as Figure 5-6.
Figure 5- 6 NIC network connection is successful
5.3.5 Synchronize network time to device
After the public network connection is successful, the device needs to synchronize the local
time of the device to the network time first. The status message on the screen interface changed
from "lte net OK" to "wait time sync", indicating that the device is synchronizing network time,
shown as Figure 5-7.