tokio-modbus
A tokio-based modbus library.
Features
- pure Rust library
- async (non-blocking)
- Modbus TCP
- Modbus RTU
Installation
Add this to your Cargo.toml
:
[dependencies]
tokio-modbus = "*"
If you like to use Modbus TCP only:
[dependencies]
tokio-modbus = { version = "*", default-features = false, features = ["tcp"] }
If you like to use Modbus RTU only:
[dependencies]
tokio-modbus = { version = "*", default-features = false, features = ["rtu"] }
TCP client example
extern crate futures;
extern crate tokio_core;
extern crate tokio_modbus;
use tokio_core::reactor::Core;
use futures::future::Future;
use tokio_modbus::{Client, TcpClient};
pub fn main() {
let mut core = Core::new().unwrap();
let handle = core.handle();
let addr = "192.168.0.222:502".parse().unwrap();
let task = TcpClient::connect(&addr, &handle).and_then(|client| {
println!("Fetching the coupler ID");
client
.read_input_registers(0x1000, 7)
.and_then(move |buff| {
println!("Response is '{:?}'", buff);
Ok(())
})
});
core.run(task).unwrap();
}
RTU client example
extern crate futures;
extern crate tokio_core;
extern crate tokio_modbus;
extern crate tokio_serial;
use tokio_core::reactor::Core;
use futures::future::Future;
use tokio_modbus::{Client, RtuClient};
use tokio_serial::{BaudRate, Serial, SerialPortSettings};
pub fn main() {
let mut core = Core::new().unwrap();
let handle = core.handle();
let tty_path = "/dev/ttyUSB0";
let server_addr = 0x01;
let mut settings = SerialPortSettings::default();
settings.baud_rate = BaudRate::Baud19200;
let mut port = Serial::from_path(tty_path, &settings, &handle).unwrap();
port.set_exclusive(false).unwrap();
let task = RtuClient::connect(port, server_addr, &handle).and_then(|client| {
println!("Reading a sensor value");
client
.read_holding_registers(0x082B, 2)
.and_then(move |res| {
println!("Sensor value is: {:?}", res);
Ok(())
})
});
core.run(task).unwrap();
}
More examples can be found in the examples folder.
Protocol-Specification
License
MIT/Apache-2.0