Trimble R750 WebUI Access Guide — Wi-Fi & Ethernet | 9JA Enterprise
WebUI Access
Trimble R750 — WebUI Connection Guide
How to access the R750's built-in web interface from any browser — no software installation required. Covers both the Wi-Fi hotspot method and the Ethernet direct cable method, including firmware v6.43+ password changes.
In this guide
Credentials
Default Login Credentials
These credentials work for both the Wi-Fi and Ethernet connection methods. Change the admin password after first login.
| Account | Username | Password | Access level |
|---|---|---|---|
| Admin | admin | password | Full access — all settings |
| Guest | guest | guest | Read-only — status and firmware info |
△ Note — credentials unknown?
If login credentials have been changed and are unknown, a factory reset via the receiver's power button sequence will restore defaults. This also resets all network and configuration settings.
Method 1
Wi-Fi Connection (Wireless)
The R750 broadcasts its own Wi-Fi access point — no router or external network needed. Connect your laptop or tablet directly to the receiver's hotspot.
1
Power on the R750
- Press and hold the power button until the LED ring illuminates.
- Wait 60–90 seconds for full boot. The Wi-Fi LED (radio icon) should glow steady white when the hotspot is active.
2
Connect your computer or tablet to the R750 Wi-Fi
- Open your OS Wi-Fi settings (Windows: system tray → Network icon).
- Look for the network named: Trimble GNSS XXXX (where XXXX = last 4 digits of the serial number).
- Select the network and enter the Wi-Fi passphrase when prompted.
💡 Wi-Fi password — firmware version matters
Firmware before v6.43: Default Wi-Fi password is abcdeabcde
Firmware v6.43 and later: The Wi-Fi password is the full device serial number (e.g. 5810012345). This is case sensitive — enter it exactly as printed on the receiver label. If abcdeabcde does not work, try the full serial number.
Firmware v6.43 and later: The Wi-Fi password is the full device serial number (e.g. 5810012345). This is case sensitive — enter it exactly as printed on the receiver label. If abcdeabcde does not work, try the full serial number.
3
Open the WebUI in your browser
- Open Chrome, Edge, Firefox, or Safari.
- In the address bar, type the following and press Enter:
http://192.168.142.1
4
Log in
- The R750 WebUI login page will appear.
- Enter: Username: admin Password: password
- Click Log In to access the dashboard.
💡 Page won't load?
Open a Command Prompt (Windows) and run:
ping 192.168.142.1 — if you get replies, the receiver is reachable and the issue is browser-related. Try clearing browser cache or using an incognito/private window. Disable any VPN software.
Wi-Fi — Quick Reference
| Parameter | Value |
|---|---|
| SSID (network name) | Trimble GNSS XXXX (last 4 digits of serial) |
| Wi-Fi password (firmware < v6.43) | abcdeabcde (factory default, firmware before v6.43) |
| Wi-Fi password (firmware v6.43+) | Full serial number — CASE SENSITIVE |
| WebUI IP address | 192.168.142.1 |
| WebUI URL | http://192.168.142.1 |
| Port | 80 (HTTP) |
| Admin username / password | admin / password |
Method 2
Ethernet Direct Cable Connection
The R750 supports Ethernet via a Trimble LEMO data cable (P/N 54693-00) that breaks out to an RJ-45 connector. This method is faster and more stable — recommended for WinFlash firmware upgrades and option file loading.
1
Obtain the correct cable
- You need the Trimble LEMO-to-Ethernet data cable, P/N 54693-00.
- One end is a LEMO 7-pin connector (plugs into the R750 data port). The other end is a standard RJ-45.
- A Trimble docking station or GEO cradle with an Ethernet port also works.
2
Connect cable and power on the R750
- Plug the LEMO end firmly into the R750 data port — align the red dot.
- Connect the RJ-45 end to your laptop's Ethernet port (or a USB-to-Ethernet adapter).
- Power on the R750 and wait 60–90 seconds for full boot.
- The link LED on your Ethernet adapter should show solid or blinking green when connected.
3
Set your PC to a static IP address
- Windows: Right-click Start → Network Connections → right-click your Ethernet adapter → Properties.
- Select Internet Protocol Version 4 (TCP/IPv4) → Properties.
- Choose "Use the following IP address" and enter these values:
| Field | Value to enter |
|---|---|
| IP Address | 192.168.1.100 |
| Subnet Mask | 255.255.255.0 |
| Default Gateway | 192.168.1.1 (or leave blank) |
| DNS Servers | (leave blank) |
4
Open the WebUI in your browser
- Open Chrome, Edge, Firefox, or Safari.
- Enter the R750's default Ethernet IP address:
http://192.168.1.20
💡 IP not responding?
If
192.168.1.20 doesn't load, try 192.168.0.20 or 192.168.1.1. You can also check the current Ethernet IP via the Wi-Fi WebUI under Settings → Network. Disable Wi-Fi on your PC while using Ethernet to prevent routing conflicts.
5
Log in
- The WebUI login page will load — same credentials as Wi-Fi.
- Username: admin Password: password
- Click Log In.
Ethernet — Quick Reference
| Parameter | Value |
|---|---|
| Required cable | Trimble LEMO-to-Ethernet P/N 54693-00 |
| R750 data port | LEMO 7-pin (align red dot when inserting) |
| PC static IP | 192.168.1.100 |
| PC subnet mask | 255.255.255.0 |
| WebUI IP (factory default) | 192.168.1.20 |
| WebUI URL | http://192.168.1.20 |
| Admin username / password | admin / password |
Dashboard
WebUI Dashboard — Key Sections
| Tab / Section | What you can do |
|---|---|
| Status | View satellite tracking, signal strength, fix type, position, and receiver uptime. |
| Configuration | Set receiver mode (Rover / Base / Repeater), I/O port settings, NMEA/CMR output formats. |
| Firmware | Check installed firmware version; initiate over-the-air firmware updates. |
| Options | View all licensed feature options (GNSS constellations, RTK, logging, radio, etc.) and load new option files. |
| Network | Configure Wi-Fi SSID and password, Ethernet IP address, NTRIP client/server settings, and Bluetooth. |
| Files | Browse internally logged raw GNSS data files — download or delete log sessions. |
| Admin | Change the WebUI password, reboot the receiver, perform a factory reset, view system log. |
Troubleshooting
Common Issues & Fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Wi-Fi network not visible in device list | Receiver still booting or Wi-Fi disabled | Wait 90 seconds after power-on. Confirm Wi-Fi LED is steady. Power cycle if needed. |
| Browser: "This site can't be reached" | PC not on receiver subnet or wrong IP | Confirm PC is connected to the R750 hotspot. Run: ping 192.168.142.1 from Command Prompt. |
| Wi-Fi password rejected | Firmware v6.43+ changed the default password | Enter the full serial number as the password — it is case sensitive. Check the label on the receiver. |
| Login page won't accept credentials | Password was changed from factory default | Try "trimble" or "abcdeabcde". Last resort: factory reset restores defaults. |
| Ethernet: no link light on adapter | Wrong cable type or damaged LEMO pin | Verify cable P/N 54693-00. Inspect LEMO pins carefully — bent pins are common on used units. |
| Ethernet: page loads then drops | IP conflict or Windows reverting to DHCP | Confirm static IP is saved correctly. Disable Wi-Fi on PC to force Ethernet-only routing. |
| WebUI loads blank or only partially | Browser cache issue or compatibility | Hard-refresh: Ctrl+Shift+R (Windows) or Cmd+Shift+R (Mac). Try an incognito or private window. |
| WinFlash can't see the R750 over Ethernet | WinFlash using wrong IP or Windows Firewall blocking | Set WinFlash connection IP to 192.168.1.20. Temporarily disable Windows Firewall for testing. |
Need expert support for your R750?
9JA Enterprise sells, repairs, and rents Trimble R750 receivers. We also offer remote diagnostics.