Modbus WASM Serial Server Simulator

Requirements: Chromium-based browser (Chrome, Edge, Opera) + HTTPS or localhost. Ensure you select the correct serial port using the browser dialog.

Server Configuration

Disconnected

Modbus Mode

Unit / Slave ID

Baud Rate

Parity

Data Bits

Stop Bits

Digital Twin Registers

Address	Value (U16)	Modify

Address	Value (U16)	Modify

Address	State	Toggle

Address	State	Toggle

Exception Status (FC07)

Status Byte Value (0 - 255)

FIFO Queue (FC18)

Queue Values (comma-separated integers)

File Records (FC14/FC15)

File Number

Record Address	Value (U16)	Modify

Server Execution Log