Modbus Poll

SCADA Protocols

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About this app

If you work with PLCs, VFDs, sensors, or any Modbus device, you know the pain. You need to check a register value. You need to write a coil. But your laptop is back at the office — or buried in your bag.
Modbus Poll for Android solves that problem. It turns your phone into a Modbus master. Connect over Wi-Fi, read registers, write values, and troubleshoot devices right from the field.
No laptop needed. No cables. Just your phone and a Wi-Fi connection.

Modbus Poll is an Android app that sends Modbus queries to electronic devices like PLCs, HMIs, drives, and sensors. It works as a Modbus master — meaning it sends requests and reads responses from your slave devices.
Think of it as a lightweight Modbus testing tool that fits in your pocket.
Supported Protocols
Most Modbus apps on Android only support basic TCP. Modbus Poll goes further. It supports four connection modes:

- Modbus TCP/IP — the standard choice for Ethernet-connected devices
- Modbus UDP/IP — faster, connectionless option for simple queries
- Modbus RTU over TCP/IP — for gateways that convert serial RTU to TCP
- Modbus RTU over UDP/IP — RTU framing over UDP connections

This means you can talk to almost any Modbus device on your network, no matter how it's set up.

What’s new

Improved UI, and better stability.