They have different size and pin definitions.

 You can enter “log version” via the serial port to get the firmware version.

1. Please check if you selected the correct baud rate when you connect the board to the serial tool.

2. Please check if the serial connection is no problem.

3. Please verify that the board is powered on successfully by checking the power LED.

Please enter “log gpgga ontime 1” via the serial port and see if there is gga message output.
1. If there is gga message but no positioning info in it(all 0 values), please check if the antenna connection is ok. If there is no problem with the antenna connection, there may be something wrong with the antenna connector on the board.
2. If there is no gga message, please enter “log authlist” to check the expire time of the board. If it has expired, please contact the local dealer for a new license.

Enter “log authlist” to check the expire date of the TAP service. 

Please provide the info below to your local dealer.

1. Serial number: XXXX

2. L-band Listening Location:

3. L-band Listening Time:

4. License Period:

5. License Property: (demo license/commercial license DCG paid/commercial license DCG unpaid)

The TAP service is turned on by default if the board if the TAP service subscription is valid. You just need to connect to the antenna and place it in an open area, and you can get a fixed solution in 3-10 minutes.

Enter “pppsource tapsat disable” to close the TAP service, and enter “pppsource tapsat enable” to turn it on again.

Enter “log lbandtrackstat ontime 1” to check the bit error rate of the TAP satellites. The last value of the return message represents the Bit Error Rate (BER). In open skies, the BER is 0.000XXX. Under a light canopy, it is 0.00XXXX, and under a heavy canopy, it is 0.0XXXXX. A reading of 0.1XXXXX means the solution cannot be fixed. If the value reaches 0.300000, the L-Band satellite signal is not tracked.

If you are in a open sky, and the BER is still very big, there may be signal interference nearby.

Yes! Tersus PPK solution is platform independent, which does not just mean that it can go from your fixed wing UAV to your Multi-rotor but also means that it operates independently of your flight controller. In fact, there is no connection between the Tersus system and your flight controller, unless you are using your flight controller to trigger event mark in Tersus system or use Tersus system for navigation purpose. So whether you are using an APM, Pixhawk, NAZA, WOOKONG, MICROPILOT, Mikrokopter, Microdrone, or any other flight controller, Tersus PPK solution will still work!

Oscar combines IMU data and GNSS RTK results to real-time calculate the three-dimensional attitude of Oscar, thereby deduce Oscar's tilt angle. 

Tersus offers four kinds of radio modules.

Tersus GeoPix integrates the functions of GNSS observation post processing, Event Mark interpolation and Geotagging in EXIF. By clicking one button after input all necessary data, the software provides the result directly as input for image processing software. Tersus GeoPix is a part of Tersus Tool Suite which can be downloaded from Tersus official website.

For details, please visit: https://www.tersus-gnss.com/software

The Tersus TC50 Controller is a rugged multi-functional data controller with design of 5'' HD touch screen and an alphanumerical keypad. Equipped with powerful Octa-core processor and android operating system, it is perfect to adapt with Tersus survey software. With professional IP68 rating, it is robust and reliable for harsh operating conditions. 

For details, please visit: https://www.tersus-gnss.com/product/tc50-controller

The Tersus TC40 Controller is a rugged smart phone with design of 8'' IPS screen and 1280*800 resolution. Equipped with Android 8.1 mainstream operating system, 8-core 2.0G processor, it is perfect to adapt with Tersus Survey software and run fast. The 9000mAh large capacity battery is detachable, which can work continuously for 10 hours without pressure. The unique rounded corner design and plastic shell are compatible with appearance and protection. With professional IP67 rating, it is robust and reliable for harsh operating conditions.

The Tersus TC20 Controller is a rugged smart phone with design of 4.3'' touch screen and an alphanumerical keypad. Equipped with powerful processor, it is perfect to adapt with Tersus Survey software. With professional IP68 rating, it is robust and reliable for harsh conditions.

For details, please visit: https://www.tersus-gnss.com/product/tc20-controller

Nuwa is a survey application software based on Android OS (Operating System), designed by and all rights reserved to Tersus GNSS Inc. Nuwa is simple, easy to use and has a friendly user interface. It is designed to work with David GNSS receiver, Oscar GNSS Receiver and other receivers which support NMEA-0183.

- Supports Bluetooth and USB connection

- Configure Base, Rover and Static Survey

- Graphical Interface with background map (online/import)

- CAD Stakeout, Road Stakeout and Earthwork

- Data Management (import/export multiple formats)

- Various built-in tools

For details, please visit: https://www.tersus-gnss.com/product/nuwa

Generally speaking, there are several main classes of applications that can be used with Tersus David GNSS receivers to attain high-precision positioning details.

- Rover + CORS 

- Base + Rover + Radio

- Base + Rover + Tersus NTRIP Caster

- Raw Measurements Collection

Tersus Oscar GNSS receiver is a new generation of tilt compensation GNSS receiver. Empowered by a high precision inertial measurement unit (IMU) on Ultimate version, this kind of calibration-free tilt compensation is immune to magnetic disturbances. Oscar gives a surveyor unprecedented flexibility and efficiency - holding the survey pole upright is no longer necessary. With an internal high-performance multi-constellation and multi-frequency GNSS board, Oscar GNSS Receiver provides high accuracy and stable signal detection.

The built-in high-performance antenna can speed up the time to first fix (TTFF) and improve anti-jamming performance. With a Nano-SIM card inserted in Oscar, it can access Internet, transmit and receive correction data through 4G/WiFi network. The built-in UHF radio module supports long distance communication. The built-in large capacity battery is detachable and can display power level. Two batteries support up to 16 hours of fieldwork in 4G/3G/2G network and Rover radio mode. Oscar can be easily configured with 1.54'' interactive screen on Ultimate and Advanced versions. The rugged housing protects the equipment from harsh environments.

For details, please visit: https://www.tersus-gnss.com/product/oscar_gnss_receiver