Modbus Monitor

Quantum Bit Solutions

About this app

Absolutely — here is your **clean, optimized, ready-to-paste Play Store full description**

**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 WiFi, Bluetooth, or USB**
**✔ Read and write coils and registers in seconds**
**✔ No complex setup or address confusion**
**✔ 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

**Works with your hardware:**

* Modbus TCP (WiFi / 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
* No ads, no tracking

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**Need more? Try Modbus Monitor Advanced (separate app):**

* Data logging & CSV export
* Continuous polling
* Automation & monitoring
* Cloud integration

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**Start testing your Modbus devices in seconds.**

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📚 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: [e-mail]
🌐 Website: ModbusMonitor.com
📺 Video Tutorials: Search "Modbus Monitor" on YouTube

Start your Modbus journey today with the easiest Modbus app available!

Ratings and reviews

It's a neat idea, but only works about halfway, at best. I could only get it to read integers. floats read as ints, so that's basically non-functional. I could not get it to write anything at all. when reading back the Tx/Rx string, it doesn't even show transmitting the Write value. Awkward overall and minimally useful. good proof of concept to continue to build.

Difficult App, very little documentation. This is all the help for using the API and there are numerous technical errors. No examples of reading or writing to coils, and no clear output of the send message and reply: "The Modbus addresses are polled using the 6-digit address scheme “Xnnnnnn”. The first digit (“X” ) is the standard Modbus address scheme followed by 5-digit Modbus". I did eventually manage to work out how to use the app myself, but it was not easy. Good documentation required.

Very useful utility, working!

What’s new

- Added Copy Button
- Comply to release policies
- Better Serial Port Configuration using single dialog
- Added Scan Button
- Crash Improvements