Suntor ST20NPT User manual

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ST20NPT User Manual
TX RX
Contents
I. Disclaimer...............................................................................................................................................................................2nd
II. Precautions for integration................................................................................................................................................... 2nd
III. List of in-box items................................................................................................................................................................4th
IV.Interface Definition................................................................................................................................................................ 5th
4.1 TX Interface Definition............................................................................................................................................... 5th
4.2. RX Interface Definition..............................................................................................................................................6th
V. Operating Instructions & Steps..............................................................................................................................................7th
5.1. Make TX and RX and accessories ready....................................................................................................................7th
5.2. Connection..................................................................................................................................................................8th
5.3. Power on..................................................................................................................................................................... 8th
5.4. Definition of indicators...............................................................................................................................................9th
5.5. Start completed.......................................................................................................................................................... 9th
VI. Antenna Installation........................................................................................................................................................... 10th
6.1. Multi-rotor UAV........................................................................................................................................................ 10th

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6.2. Fixed Wing UAV.........................................................................................................................................................11th
VII. Software Operation........................................................................................................................................................... 11th
7.1. Two ways for changing the parameters.................................................................................................................... 11th
7.2. How to use the software...................................................................................................................................... 12th
7.2.1. Login..............................................................................................................................................................12th
7.2.2. RF Configuration...........................................................................................................................................13th
7.2.3. RS1 Configuration.........................................................................................................................................15th
7.2.4. RS2 Configuration.........................................................................................................................................16th
7.2.5. IP New Network Configuration.................................................................................................................... 17th
7.2.6. RF New NET Configuration......................................................................................................................... 17th
SUNTOR ELECTRONICS CO., LIMITED
I. Disclaimer
SUNTOR is the registered trademark of SUNTOR ELECTRONICS CO., LIMITED. All product names and brands
in this manual are trademarks or registered trademarks of the Company. SUNTOR ELECTRONICS CO.,
LIMITED reserves all copyrights of the product and the manual. All the information must not be copied or
reproduced in any form without permission of SUNTOR. There may be semantic differences between
disclaimers of different languages. The Chinese version shall prevail in Chinese mainland, while the English
version shall prevail in other regions. Thank you for purchasing SUNTOR ST20NPT. Please use ST20NPT
according to local radio regulations. Before using, please carefully read this disclaimer. Once the product is
used, all the contents of the disclaimer will be regarded recognized and accepted. Please install and
operate the product in strictly accordance with the requirements of this manual. SUNTOR ELECTRONICS CO.,
LIMITED and its affiliates will not assume any legal responsibility for results or losses caused by improper
use, installation, assembly and modification (including the use of non-specified SUNTOR parts and
accessories, such as the radio power amplifier, antenna and SMA extension cord).
II. Precautions for integration
1) Be sure to use the parts provided by SUNTOR.
2) Before powering on please make sure the antenna are in good connection and not install or remove
the antennas with power on.
3) Given that the carbon fiber body and metal load may have shielding effects on antenna signals, they
should not be installed between the antenna and ground terminal. Keep the antenna on board free
from winding or blocking by obstacles. The antenna end should be vertically downward without
bending to prevent shortening communication distance and failure communication.
4) Antennas on board should be kept away from other radio antennas to avoid electromagnetic noise and
V2.0

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interference. We recommend to make full use of data and video transmitting function of ST20NPT to
minimize the radio devices quantity on board.
5) Do not disassemble or modify SUNTOR ST20NPT. Any problem occur during installation, contact
SUNTOR or SUNTOR local branch office.
6) Keep appropriate distances between different electronic devices during installation to minimize the
electromagnetic interference.
7) Before using, please make sure all cables are in good connection and all components can work
properly.
8) After starting the product, the self-test indicators of ST20NPT will continuously blink for 30s and then
keep bright. Only after the video from the camera shown on the display, then you can confirm that the
device work properly now.
9) Check the surrounding environment to ensure there is no other 2.4GHz devices to cause interference.
10) If you use the Futaba remote controller, the controller should be adjusted into the French mode.
11) Adjust the Futaba controller into French mode as following steps:
[LINKAGE MENU]→FRQUENCY→ RTN b→ [AREA]→[FRANCE]
Or connect ST20NPT S1 serial port with trainer interface on back side of Futaba by TTL cable. And set the
Futaba RF as OFF. Through the S1 port uplink the PPM/SBUS signal.
12) Before using, please check the power of RX and TX. If the receiver power off, transmitter on board will
lose connection.
13) Adjusting RX antenna inclination can improve the signal strength and image quality.
14) The camera should be fully charged to ensure normal video output.
15) ST20NPT support video and duplex data communication. If the video stuck or stopped for more than
10s. It means the radio signal is weakened or the radio channel is narrowed. In this case, the aircraft
need to fly back to short the distance between TX and RX. Otherwise the TX will lose connection.
16) Please use good electromagnetic shielding accessories(such as HD displays, Network cables, etc.)
Notes: Improper operation of ST20NPT may cause personal injury or damage to properties. Please pay high

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attention to operation safety.
III. List of in-box items
On board *1
Ground terminal *1
TX antenna *2
RX antenna *2
DC to DC power cable *2
Network cable *2
TTL cable *2 (Length: 20cm)
TTL to RS232 * 2(Supply On Request)
USB TTL Cable*2
SMA Cable(Copper wire tinned shield semi-soft line) *2

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IV.Interface Definition
4.1 TX Interface Definition
A: DC7~18V input *1
B: Power on/off
C: RS232 serial port
D: S2 serial port(Audio)
E: Ethernet*1
F: WL indicator*1
G: Screw hollows *4 (for installation)
H: SMA antenna *1 (AUX Antenna)
I: S1 TTL serial port*1
J: Working station indicators * 6
K: SMA antenna *1 (Main Antenna)
L: HDMI mini*1(No available for ST20NPT)

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4.2. RX Interface Definition
4.2.1. RF Interface
RF: Standard SMA to connect with antenna or feeder cable
4.2.2. Ethernet Port
ETH：EZH 4P 1.5mm
4.2.3. Power Input Interface
DC: 3.5×1.35(Male) to 5.5×2.1(Female)
No
ETH Signal Definition
1
TX+
2
TX
3
RX+
4
RX

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4.2.4. Serial Port: : H 1.0mm 5P
V. Operating Instructions & Steps
5.1. Make TX and RX and accessories ready.
Besides the whole equipment we supply, you also need to make sure the IP Camera, display and power ready before
operating.
SH 5P NO.
Definition
1
TXD
2
RXD
3
3.3V
4
GND
5
No Definition

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5.2. Connection
Make the power cable, Ethernet cable, serial port cable and antennas in good connection.
(the serial port cable is for data links)
5.3. Power on
After checking all the connections are in good condition, turn on the the IP Camera, PC, transmitter and receiver. The
indicators will bright and the whole system starts work.

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5.4. Definition of indicators
5.4.1. TX Indicators Definition
After powering on, the devices will boot normally.
Then the indicators’ normal state will be as follows:
(1) Indicator light 1, 2, 3 and 6 will turn on in
green color.
(2) After one second, indicator light 1(green),
2(green), 3(green) and 6(blue) will start to
blink.
(3) After the startup completed, indicator light 1(green), 2(green), 3(green), 5(green) and 6(blue) will keep constant
bright. Indicator light 4(red) will blink frequently.
5.4.2. RX Indicators Definition
When the device begin to normally start work, all
indicators status is described as follow:
1) After powering on, light 1,2,3 turn green, light 6
turns blue and light 8 turns red.
2) After 1 second, light 1(Green), 2(Green), 3(Green)
and 6(Blue) start to blink. Light 5 (Green) and
8(Red) will keep constant light.
3) After the starting completed. Light 1(Green),
2(Green), 3(Green), 4(Red), 6(blue) and 8(Red) will
keep constant bright. By the way, when you use the the ETH1, 7 (Green) will blink frequently.
5.5. Start completed
The default IP address of the transmitter is 192.168.55.1 and the receiver is 192.168.55.2. You can match the IP camera
with the devices, then you can see the video in the screen which is transferred from the IP camera.
Remark: In UAV application, please make the connection successfully and the video show on ground station smoothly
then fly the UAV. About how to install the antenna on UAV please refer the following description.

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VI. Antenna Installation
6.1. Multi-rotor UAV
1) Using SMA metal shielded semi-flexible blue feeder cable provided by SUNTOR to connect the TX SMA
port with antenna.
2) The antenna needs to be
mounted vertically downwards.
3) The best installation location is
UAV ground bracket. With
antenna inside, the bracket can
only use fiberglass material.
4) If the ground bracket is
automatically retracted, the
antenna can be installed in the
lower part of the aircraft.
5) If the antenna is intercepted by
the camera or pod or the
loudspeaker, the video on RX
will appear image stuck or
mosaic.
SMA Feeder Cable

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6.2. Fixed Wing UAV
1) Using SMA metal shielded semi-flexible blue feeder cable provided by SUNTOR to connect the TX SMA
port with antenna.
2) The antenna needs to be mounted vertically downwards.
3) The best installation position is center of UAV tail, prominent outside the body and vertical downward.
4) The second optional mounting position is located below the wing and body joints, vertical down, as far
as possible away from the wing but near the machine abdomen, protruding below the abdomen level.
VII. Software Operation
7.1. Two ways for changing the parameters
The parameters can be changed by software SUNTOR supplied such as bandwidth, code stream and so on. Two
windows for device on board and ground station can be operated at the same time to do monitoring or setting. The

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SNR (db) / RSSI (dbm) will be updated in real time.
Notes：As for one pair of our devices, their parameters should be consistent, which means when you
change one of them, you have to change another one, or they will lose connection.
There are two ways to modify the parameters.
Solution 1. Connect Transmitter and Receiver separately to PC, then change their parameters one by one.
Solution 2. Make sure communication between TX and RX is successful, connect TX with PC to changing another one
RX parameters by input its IP address firstly. After changing finsh, the communication will fail. Becasue the
parameters of TX and RX are different now. Secondly, change the TX parameters. After the changing is ok, the
communication will be successful again. If you connect the PC with RX, you need to change the TX parameters firstly,
then is the RX parameters.
7.2. How to use the software
7.2.1. Login
1Open the TDD software
2Inputthe IP address (TX Default IP: 192.168.55.1)( TX Default IP: 192.168.55.2)

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3Next click Connect TDD button.
7.2.2. RF Configuration
Take TX as a sample, In RF Part, you can modify six parameters listed in
the following picture: TX Rate, TX Power, Channel Bandwidth, Channel
Frequency, Wireless Distance, TX-RX as the follow pic.
TX Rate (Default: QPSK FEC 1/2)
This setting determines the modulation type and rate that the data will be
wirelessly transferred.
‘Auto’ means the system will transfer data at the highest possible rate in
consideration of the receive signal strength (RSSI). Refer to Performance for a
table breakdown of performance at selected rates.
If setting a fixed TX Rate It is recommended to retain a fade margin of at least
10 dbm for optimum performance. For example, for a link (8MHz channel) with
a signal strength at least –75dBm, a TX rate of 16-QAM 3/4 FEC is
recommended. Setting to the highest rate with a poor link may result in
reduced performance.
Channel Bandwidth (Default: 4Mhz)
You can select the channel bandwidth from the list. Refer to the
specifications to see the relationship and performance between
channel bandwidth, throughput and sensitivity. Generally a larger
channel has greater throughput, at the cost of sensitivity, while a
smaller channel tends to be more robust, but at the cost of
throughput.

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Channel-Frequency (Default: 2479Mhz)
2402 - 2482 (1MHz BW, CH 1-81)
2402 - 2482 (2MHz BW, CH 1-81)
2405 - 2479 (4MHz BW, CH 4-78)
2407 - 2477 (8MHz BW, CH 6-76)
Wireless Distance (Default: e.g.,ST11HPT 10km)
The Wireless Distance parameter allows a user to set the expected
distance that the wireless signal needs to travel. The TDD-COFDM sets
various internal timeouts to account for this travel time. Longer
distances will require a higher setting, and shorter distances may
perform better if the setting is reduced.
RX-TX Mode
TX Master - A Master may provide a wireless data connection to many
slaves
RX Slave: A Salve may sustain one wireless connection,i.e. to an
Master.

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TX Power(Default: 29dbm)
This setting establishes the transmit power level which
will be presented to the antenna connector of the
TDD_COFDM. Unless required, the Tx Power should
not be set into maximum, but rather for the minimum
value required to maintain an adequate system fade
margin.
7.2.3. RS1 Configuration
In this section, you can modify two parameters listed in the
following picture: Data Baud Rate and Data Format
Data Baud Rate(Default: 115200)
The serial baud rate is the rate at which modem is to communicate with the
attached local asynchronous device.

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Data Format (Default: 8N1)
This setting determines the format of the data on the serial port.The default
is 8 data bits, No parity, and 1 Stop bit.
7.2.4. RS2 Configuration
This setting determines which protocol the serial server will use to transmit serial port data over the TDD-COFDM
network.

Remote IP Address
IP address of distant device to which UDP packets are sent when
data received at serial port.
Default: 192.168.55.2(master)
192.168.55.1(slave)

Remote Port
UDP port of distant device mentioned above.
Default: 20002

Listening Port
UDP port which the IP Series listens to (monitors).
UDP packets received on this port are forwarded to the unit’s
serial port.
Default: 20002

UDP Timeout(s)
UDP Timeout in second.
Default: 10
Character Timeout(ms)
Character Timeout in millisecond.
Default:10
Max Packet size
Default:1024

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7.2.5. IP New Network Configuration
This setting helps you to change the IP address of devices. The default
of master’s IP address is 192.168.55.1. The default of slave’s IP address
is 192.168.55.2
For example, if you want to change the master’s IP address to
“192.168.55”. Please do as the following steps.
IP Set : 192.168.55.5
IP Mask Set: 255.255.255.0
IP Gateway Set: 192.168.55.1
Then click the IP NEW NETWORK button.
Attention! When you have changed the IP address ,you should correct
another device ‘s “Remote IP Addr” into the same “IP SET”, or the serial
port will lose connection.
For example , you have changed the master’s IP address to “192.168.55.5”, the you should correct the salver’s
“Remote IP Addr” to “192.168.55.5”.
7.2.6. RF New NET Configuration
RF Net ID:
Each network of TDD-COFDM modules must have a unique Network
ID. This Network ID must be set in each unit on the network.
RF Encrypt KEY
This is the password, or preshared key that is required by any device
to connect to the wireless interface of the TDD-COFDM. It is to always
have a password defined, and changed from the factory default.
After you change the ID or the RF Encrypt Key, you need click the RF
NEW NET to save the changing.
Note: After many times chaning parameres, the software will be unstable. Then you need to click the RSETTDD
Button to restart the software. After restart, the software will be very stable.