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.