Question 1

How to set up a Modbus TCP client with tokio-modbus?

Accepted Answer

Add tokio-modbus with the 'tcp' feature in Cargo.toml, then use the async API to connect via TCP and read/write registers or coils. The README provides example configurations for feature selection.

Question 2

Does tokio-modbus work with serial ports for RTU communication?

Accepted Answer

Yes, it supports Modbus RTU over serial interfaces like RS-485 using the 'rtu' feature, but you'll need to handle serial port configuration (e.g., baud rate) externally, as the library focuses on protocol handling.

Question 3

tokio-modbus vs libmodbus: which is better for industrial projects?

Accepted Answer

tokio-modbus offers Rust's safety and modern async patterns, while libmodbus is a C library with broader ecosystem support. Choose based on language preference; tokio-modbus is ideal for Rust-centric teams prioritizing memory safety.

Question 4

Can I use tokio-modbus in embedded systems?

Accepted Answer

It's possible with Rust embedded projects, but the tokio runtime may add memory overhead. Use sync features or limit async components, and ensure your target supports tokio's requirements.

Question 5

How to implement a custom Modbus server with error handling?

Accepted Answer

Start with the provided server implementations (e.g., 'rtu-server' feature) and customize by implementing trait methods for request handling. The library is designed for extension, but error handling relies on Rust's Result types, requiring manual integration for specific use cases.

Question 6

What are the performance benchmarks for tokio-modbus?

Accepted Answer

The README doesn't include benchmarks, but as a pure Rust library, it leverages tokio's efficient async runtime. Performance depends on hardware and network conditions; for critical applications, conduct your own testing with real devices.

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