Function read_data_set_ready 

pub fn read_data_set_ready<R: Runtime>(
    _app: AppHandle<R>,
    serial: State<'_, SerialPort<R>>,
    path: String,
) -> Result<bool, Error>

Reads the DSR (Data Set Ready) control signal state

Reads the current state of the DSR signal line. This signal indicates whether the remote device (modem) is ready for communication.

Arguments

• _app - The Tauri app handle
• serial - The serial port state
• path - The path to the serial port (e.g., “COM1”, “/dev/ttyUSB0”)

Returns

The DSR signal state (true for high, false for low), or an Error if it failed.

Example

use tauri_plugin_serialplugin::commands::read_data_set_ready;
use tauri::{AppHandle, State};
 
#[tauri::command]
async fn check_dsr(
    app: AppHandle<tauri::Wry>,
    serial: State<'_, tauri_plugin_serialplugin::desktop_api::SerialPort<tauri::Wry>>
) -> Result<(), String> {
    let dsr_state = read_data_set_ready(app, serial, "COM1".to_string())
        .map_err(|e| e.to_string())?;
    println!("DSR signal is: {}", if dsr_state { "high" } else { "low" });
    Ok(())
}

JavaScript Equivalent

import { SerialPort } from "tauri-plugin-serialplugin-api";;
 
const port = new SerialPort({ path: "COM1" });
await port.open();
const dsrState = await port.readDataSetReady();
console.log("DSR signal is:", dsrState ? "high" : "low");