Modbus/Serial Monitor

SyncLabs.

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About this app

Modbus / Serial Monitor is a professional-grade tool for engineers, makers, and industrial technicians who need to communicate with serial devices directly from their Android phone or tablet.

Connect via USB or Bluetooth
Connect to RS-485/RS-232 converters over USB OTG, or pair with BLE serial modules including Nordic UART (NUS), HM-10, JDY-08, and ESP32 BLE UART.

Modbus RTU Support
Send and receive Modbus RTU frames with configurable device ID, function code, register address, and value. Supports FC01–FC06 and FC16. Built-in CRC calculation — no manual byte counting needed.

Quick Messages
Save frequently used command sequences and send them with a single tap. Perfect for repetitive testing workflows.

Modbus Profiles
Configure and monitor multiple sensor registers simultaneously. View live register readings from your Modbus devices in a clean, structured layout.

Serial Monitor
Raw serial terminal with timestamped log output. View all incoming and outgoing bytes in real time.

Key Features

USB Serial (CH340, CP210x, FTDI, and more)
BLE Serial (Nordic UART, HM-10/AT-09, ESP32)
Modbus RTU frame builder with CRC
Multi-register sensor monitoring
Quick message shortcuts
Dark theme optimized for workshop environments
Landscape mode with split terminal view
Ideal for RS-485 bus diagnostics, sensor commissioning, PLC testing, and embedded development.

What’s new

Fixed several connection and stability issues, including USB disconnect handling, reconnect baud rate behavior, and dialog crashes in profile settings. Also improved repeat send controls, quick message handling, and Modbus monitor usability.