Septentrio RxTools

RxTools is a desktop software suite from Septentrio for configuring and monitoring Septentrio GNSS receivers such as the mosaic-X5, mosaic-H, AsteRx-m3, and AsteRx SB series. The suite includes two key applications: RxControl for real-time receiver monitoring and configuration, and DataLink for serial and network data routing. To stream NTRIP corrections from RTKdata.com to a Septentrio receiver, you use DataLink as the NTRIP client to bridge correction data to the receiver. Alternatively, the receiver's built-in web interface offers a simpler path for users who prefer browser-based configuration.

Download: Septentrio RxTools (Windows, free)

Requirements

• Septentrio GNSS receiver (mosaic-X5, mosaic-H, AsteRx series, etc.)

• Multi-band GNSS antenna with clear sky view

• USB or serial cable connecting the receiver to your Windows PC

• Windows PC with RxTools installed and internet access

• Active RTKdata.com account with username and password

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Step-by-step setup (DataLink method)

1

Connect the receiver with RxControl

1. Connect your Septentrio receiver to the PC via USB or serial cable.

2. Launch RxControl from the RxTools suite.

3. Go to File → New Connection and select USB or the appropriate COM port.

4. Click Connect. RxControl will display receiver status, satellite tracking, and position data.

5. Verify that the receiver is tracking satellites and has at least a standalone position fix.

2

Configure NMEA GGA output

Before setting up DataLink, ensure the receiver outputs GGA messages so the NTRIP caster can determine your approximate position.

1. In RxControl, go to Navigation → Advanced Output Settings.

2. Under NMEA Output, enable GGA on the connection port (USB1 or COM1) at a 1-second interval.

3. Apply the settings.

Why GGA matters: RTKdata.com uses the AUTO mountpoint to generate a Virtual Reference Station based on your position. Without GGA output, the caster cannot determine your location and will not send appropriate corrections. This is the most common reason for NTRIP connections that appear active but produce no RTK improvement.

3

Launch DataLink and create connections

1. Launch DataLink from the RxTools suite (or from RxControl via Tools → DataLink).

2. You need to create two connections and bridge them:

Connection 1 — Serial Port (to the receiver):

1. Click New Connection → Serial Port.

2. Select the COM port or USB port connected to your Septentrio receiver.

3. Set the baud rate to 115200 (default for most Septentrio receivers).

4. Click OK.

Connection 2 — NTRIP Client (to RTKdata.com):

1. Click New Connection → NTRIP Client.

2. Fill in the connection fields:

• Send NMEA GGA: Enabled

North America

• Host (domain): rtk.rtkdata.com

• Host (IP fallback): 13.56.117.10

• Port: 2101

• Username / Password: From RTK Credentials in the internal dashboard (not website login)

• Mountpoint (ALL CAPS): AUTO (recommended) — or AUTO_WGS84, AUTO_ITRF2020, AUTO_ITRF2014

Europe

Australia

4

Bridge the two connections

1. In DataLink, select both connections.

2. Click Link or drag one connection onto the other to create a bidirectional bridge.

3. The bridge routes GGA from the receiver to the NTRIP caster, and RTCM corrections from the caster to the receiver.

4. Data flow indicators should show bytes moving in both directions.

5

Monitor RTK convergence in RxControl

1. Switch back to RxControl.

2. Open the Position window and the PVT Status panel.

3. Watch the solution type progress: Standalone → DGPS → RTK Float → RTK FIX.

4. Once RTK FIX appears, centimeter-level accuracy is achieved.

How to verify RTK is working:

• PVT Mode in RxControl shows RTK Fixed (solution type 4).

• Horizontal accuracy drops to 0.01–0.02 m.

• Correction age stays below 5 seconds.

• DataLink shows active bidirectional data flow (byte counters incrementing).

• Satellite Tracking view shows differential corrections applied (satellites marked with "D").

Alternative: Web interface method

Septentrio receivers include a built-in web interface that can configure NTRIP directly, bypassing DataLink entirely.

1. Connect the receiver via USB and open a browser to http://192.168.3.1 (default IP).

2. Navigate to Communication → NTRIP Client.

3. Enter the same RTKdata.com connection settings from the tabs above.

4. Enable the NTRIP client and monitor status from the web dashboard.

The web interface method is simpler and recommended for field deployments where you do not want to run desktop software.

Troubleshooting

Problem	Cause	Fix
DataLink NTRIP connection fails	Wrong hostname or port	Verify hostname; confirm port is 2101
Connected but no corrections applied	Bridge not configured	Ensure serial and NTRIP connections are linked bidirectionally in DataLink
Stuck on FLOAT	GGA not sent to caster	Enable GGA output at 1 Hz on the receiver port; check DataLink GGA forwarding
"Mountpoint not found"	Lowercase or wrong name	Enter AUTO in ALL CAPS
COM port busy or unavailable	Another app using the port	Close other serial tools; use separate ports for RxControl and DataLink
Position jumps erratically	Multipath interference	Move antenna away from reflective surfaces; use a ground plane

Tips for Septentrio RxTools

• DataLink is a routing tool. It passes data between caster and receiver without processing corrections.

• RxControl diagnostics. Use built-in sky plots, position scatter plots, and C/N0 views to diagnose signal quality.

• Keep firmware current. Septentrio firmware updates improve NTRIP handling and RTK convergence time.

• Advanced mountpoints. For specific reference frames, use AUTO_ITRF2020 or AUTO_ITRF2014 instead of AUTO.

• Concurrent logging. RxControl can log raw SBF data while receiving corrections for post-processing QC.