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Solar O&M
Test inverters, meters, weather stations, and protection relays at the solar site.
MODBUS RTU · RS485 · ANDROID
Diagnose Modbus RTU Problems.Right From Your Android Phone.
Read and write registers, scan Slave IDs, inspect raw TX/RX frames, decode values, and troubleshoot communication problems — without carrying a laptop.
Your portable field bench
- 01Android
- 02USB OTG
- 03USB-RS485
- 04Device
Built for the field
When Modbus Doesn't Work, Find Out Why.
A silent device or an implausible value can have many causes. Test the likely failure points directly beside the equipment.
- 01
The device is not responding.
- 02
The values look wrong.
- 03
You don't know the Slave ID.
- 04
Wiring, serial settings, addressing, and data format are all suspects.
No laptop. No complicated setup. Connect, inspect the evidence, and narrow the problem down.
Core features
A Field Workbench in Your Pocket.
Switch between the essential Modbus tools without rebuilding your test setup.
AI-assisted diagnosis
Don't Just See the Error.Understand What to Check Next.
The assistant analyzes a diagnostic snapshot — communication settings, TX/RX history, errors, and decoded values — then proposes practical field checks.
Less guessing. Faster troubleshooting.AI Diagnosis is an experimental troubleshooting assistant. Verify results with qualified personnel and the device documentation.
Diagnostic snapshot
- Serial settings
- TX/RX history
- Errors & timeouts
- Decoded values
Likely causes to investigate
- Wrong Slave ID or function code
- Baud rate or parity mismatch
- RS485 A/B, GND, or termination problem
- CRC mismatch or electrical noise
- Register offset, endianness, or data type mismatch
How it works
Start Testing in 3 Steps.
- 01
Connect
Connect a USB-RS485 converter to your Android phone or tablet using USB OTG.
Android → USB OTG → USB-RS485 → RS485 Device - 02
Configure
Set baud rate, data bits, parity, stop bits, and Slave ID. Enter a register or select a saved template.
Serial settings + address + register - 03
Diagnose
Read the device, inspect responses, monitor traffic, decode values, or run AI-assisted diagnosis.
Read → Inspect → Narrow down
Use cases
Made for Engineers Who Work With Equipment.
Industrial Automation
Verify PLCs, sensors, controllers, gateways, and industrial equipment.
Equipment Commissioning
Confirm serial settings and register responses before handover.
Field Maintenance
Separate network, configuration, protocol, and device-level failures.
Protocol Development
Validate register maps and Modbus implementations during integration.
Troubleshooting
Use raw communication evidence instead of guessing what happened on the bus.
Free & Pro
Start Free. Upgrade When the Work Demands More.
The essential read workflow is available free. Pro adds the tools used for deeper commissioning and diagnosis.
01
Free
For basic Modbus RTU testing
- Basic register reading
- Standard communication settings
- Local protocol search
- Favorites
- Limited custom templates
02
Pro
For regular field and commissioning work
- Advanced communication controls
- Write operations with verification
- Continuous polling and Slave ID Scan
- Extended bus monitor and history
- Advanced templates and protocol testing
- AI-assisted diagnosis access*
*Cloud and AI functionality may be subject to usage limits.
Hardware requirements
What You Need.
The field installation may also require correct A/B wiring, a GND reference, device power, and suitable termination.
- 01Android 7.0 or newer
- 02Android phone or tablet with USB Host / OTG support
- 03USB-RS485 converter
- 04USB-C adapter when required
- 05A powered RS485 device to test
FAQ
Frequently Asked Questions.
Does the app require a laptop?
No. Common RS485 and Modbus RTU tests run directly from a compatible Android phone or tablet.
What hardware do I need?
Normally: Android device → USB OTG → USB-RS485 converter → RS485 device.
Can I scan for an unknown Slave ID?
Yes. Quick Scan can search a Slave ID range and identify responding devices.
Can I see the raw Modbus communication?
Yes. The bus monitor shows TX/RX frames, communication history, errors, and response information.
Can the app write registers?
Yes. Pro supports common Modbus write operations with read-back verification. Confirm the register map and equipment safety requirements before writing.
What if the value I read looks wrong?
Compare UInt16, Int16, HEX, Binary, 32-bit, and Float32 interpretations. Register offset, data type, byte order, and word order are common causes.
What does AI Diagnosis do?
It uses available communication settings, TX/RX history, errors, and decoded values to suggest likely causes and practical next checks. It does not replace device documentation or professional judgment.
Is this only for solar equipment?
No. It works with compatible Modbus RTU / RS485 equipment across energy, automation, building control, instrumentation, PLC, meter, sensor, and controller applications.
Your next field check
Stop Guessing What's Wrong With Your RS485 Connection.
Turn the Android phone already in your pocket into a practical Modbus RTU field diagnostic tool.
Read. Scan. Monitor. Diagnose.