Modbus Poll

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.