Struct AsyncMaster 

pub struct AsyncMaster { /* private fields */ }

Async Modbus RTU master that honors Modbus idle timing rules between frames.

Implementations

impl AsyncMaster

pub fn new_rs485(path: &str, baud_rate: u32) -> Result<Self>

Builds a master configured for an RS-485 style setup (8N1, async I/O).

The port timeout is pinned to the Modbus RTU silent interval (T3.5) for the supplied baud rate so that the reader can detect frame boundaries.

pub fn baud_rate(&self) -> u32

Returns the baud rate currently configured on the serial link.

pub fn set_baudrate(&mut self, baud_rate: u32) -> Result<()>

Updates the serial baud rate and matching Modbus idle timeout.

pub async fn send(&mut self, req: &Request<'_>) -> Result<Response, Error>

Sends a Modbus RTU request and waits for the corresponding response.

Broadcast requests return immediately after the frame is flushed because the Modbus RTU spec forbids responses to slave id 0.

Trait Implementations

impl Debug for AsyncMaster

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.