Modbus Monitor Free is a fast simple Modbus TCP/RTU tester for Android.
Connect to PLCs sensors and industrial devices in seconds — no coding required.

Easy enough for beginners. Powerful enough for real-world testing.

✔ Connect instantly via Wi-Fi Bluetooth or USB
✔ Read and write coils and registers in seconds
✔ Simple form-based setup with clear register addressing
✔ Clean form-based interface — just enter values and go

Simple 3-step workflow:

1. Select function (FC01 FC02 FC03 FC04 FC05 FC06 FC15 FC16)
2. Enter device address and register
3. Tap Read or Write

Connect wired or wireless:

- Modbus TCP (Wi-Fi / Ethernet)
- Bluetooth Classic (SPP)
- Bluetooth Low Energy (BLE)
- USB Serial (FTDI Prolific CH34x CP21xx CDC)

Perfect for:

- PLC testing and troubleshooting
- Sensor and device diagnostics
- Industrial automation learning
- Arduino / Raspberry Pi Modbus projects
- Field engineers and technicians

What you can do:

- Test communication before programming
- Read live values from devices
- Write registers and control outputs
- Validate Modbus configurations quickly

Key features:

- Function code dropdown (no memorizing required)
- Separate fields for device register quantity and value
- Real-time response display
- 6-digit address preview
- Clean lightweight interface

Need continuous monitoring? Try Modbus Monitor Advanced:

- Monitor up to three communication channels simultaneously
- Data logging & CSV export
- Advanced data conversion
- Reusable monitoring configurations
- Automation and advanced monitoring tools
- Pre-built Modbus device maps available for energy meters power meters PLCs and more

Start testing your Modbus devices in seconds.

📚 Learning Resources:
Built-in helper tips guide you through each step
Video tutorials on our YouTube channel
Responsive email support
Active user community

Need Help?
📧 Email: [email protected]
🌐 Website: ModbusMonitor.com
📺 Video Tutorials: Search "Modbus Monitor" on YouTube

Start testing Modbus devices today with a simple practical Android Modbus tool.