modbus with rust

[preveen-stack]

To read a Modbus holding register in Rust language, you can use a Modbus library that supports the Modbus protocol over a serial or TCP connection. One such library is the modbus-rs library.

Here is an example code snippet that shows how to use the modbus-rs library to read a Modbus holding register:

use modbus::{Client, Coil, Error, ModbusClient, ReadHoldingRegisters};

fn main() -> Result<(), Error> {
    let client = modbus::rtu::connect("/dev/ttyUSB0", 19200)?;
    let response = client
        .call(ReadHoldingRegisters::new(0x0000, 0x0001))?;
    let value = response.get(0)?;
    println!("Value: {}", value);
    Ok(())
}

This code creates a Modbus client over a serial connection with a baud rate of 19200. It then sends a request to read a holding register at address 0x0000 with a count of 1. The response is then printed to the console.

Note that you'll need to add the modbus library to your project's dependencies in the Cargo.toml file:

[dependencies]
modbus = "0.11.0"

Also, make sure to import the necessary modules at the top of your Rust file:

use modbus::{Client, Coil, Error, ModbusClient, ReadHoldingRegisters};

Finally, make sure to handle any errors that may arise when using the Modbus library. In this example, we're simply printing any errors to the console.