Struct ModbusInstrument 

pub struct ModbusInstrument {
    pub slave_addr: u8,
    pub port_path: String,
    pub baudrate: u64,
    pub timeout: Duration,
    pub ctx: Context,
}

A generic async Modbus instrument.

Note: according to the Modbus spec, “coils” hold boolean values, while registers hold u16 values. This is reflected in the methods in this struct.

Fields

slave_addr: u8

port_path: String

baudrate: u64

timeout: Duration

ctx: Context

Implementations

impl ModbusInstrument

pub async fn new( slave_addr: u8, port_path: &str, baudrate: u64, timeout: Duration, ) -> Result<ModbusInstrument>

Creates a new ModbusInstrument. Opens a serial port on the given port path.

This will not fail if the device is unresponsive, only if the port file (/dev/ttyUSB0 or similar) doesn’t exist.

pub async fn read_registers( &mut self, register: u16, count: u16, ) -> Result<Vec<u16>>

Asyncronously reads a number of registers.

pub async fn write_register(&mut self, register: u16, value: u16) -> Result<()>

Writes to a register with the given u16. Returns Ok(()) on success.

pub async fn read_coils(&mut self, coil: u16, count: u16) -> Result<Vec<bool>>

The same as read_registers(), but for coils

pub async fn write_coil(&mut self, coil: u16, value: bool) -> Result<()>

The same as write_register(), but for coils

Trait Implementations

impl Debug for ModbusInstrument

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

Formats the value using the given formatter.