scietex.hal.serial 1.2.4

Scietex Serial Communication Library

scietex.hal.serial

scietex.hal.serial is a comprehensive serial communication library designed to provide a high-level interface for managing serial ports and facilitating communication with serial devices. The package is structured into four main modules, each serving a distinct purpose:

• config: Simplifies the creation, storage, and serialization of serial port configurations.
• virtual: Enables the generation and management of virtual serial networks, ideal for testing environments and overcoming hardware limitations.
• server: Implements a Modbus server to streamline communication between various devices and applications.
• client: Provides a Modbus client that can be customized to interact with a wide range of the equipment.

System Requirements

• Python: 3.9 or higher.
• Operating Systems: Compatible with Linux and macOS.

Installation

To install the package, execute the following command in your terminal:

pip install scietex.hal.serial

Usage

Serial Connection Configuration

Configuring a serial connection is straightforward. Here's how you can set it up:

from scietex.hal.serial import SerialConnectionConfig

ser_conf = SerialConnectionConfig(port="/dev/ttyS01")
ser_conf.baudrate = 9600

For serialization purposes, you can convert the configuration to a dictionary:

from scietex.hal.serial import (
  SerialConnectionConfig, ModbusSerialConnectionConfig
)

ser_conf = SerialConnectionConfig(port="/dev/ttyS01")
ser_conf.baudrate = 9600
ser_conf.timeout = 1.0
print(ser_conf)

modbus_conf = ModbusSerialConnectionConfig(**ser_conf.to_dict())
print(modbus_conf)

Virtual Serial Network

Creating a virtual serial network is simple. Here's an example of creating a virtual serial pair:

from scietex.hal.serial import VirtualSerialPair

if __name__ == "__main__":
    vsp = VirtualSerialPair()
    vsp.start()
    # Now your virtual serial pair is ready
    print(vsp.serial_ports)

    vsp.stop()

For more complex topologies, you can use the VirtualSerialNetwork class to connect multiple virtual ports or even integrate with external physical ports:

from scietex.hal.serial import VirtualSerialNetwork, SerialConnectionConfig

if __name__ == "__main__":
    vsn1 = VirtualSerialNetwork(virtual_ports_num=3)
    vsn1.start()
    print(f"VSN 1 ports: {vsn1.serial_ports}")

    vsn2 = VirtualSerialNetwork(virtual_ports_num=2)
    vsn2.start()

    vsn2.add(
        [SerialConnectionConfig(vsn1.serial_ports[0])]
    )

    # Create two more virtual ports
    vsn1.create(2)

    print(f"VSN 1 ports: {vsn1.serial_ports}")
    print(f"VSN 2 ports: {vsn2.serial_ports}")

    vsn1.stop()
    vsn2.stop()

Modbus Server

To start a Modbus server, follow these steps:

import asyncio
from scietex.hal.serial import RS485Server, ModbusSerialConnectionConfig


async def main():
    config = ModbusSerialConnectionConfig("/dev/ttyS001")
    server = RS485Server(config)
    await server.start()

    await server.stop()


if __name__ == "__main__":
    asyncio.run(main())

The server supports multiple slaves, which can be added, updated, or removed dynamically.

Modbus Client

The Modbus client requires a connection configuration and a slave address. Optionally, you can provide a label for enhanced logging readability:

import asyncio
from scietex.hal.serial import VirtualSerialPair, RS485Server, RS485Client, ModbusSerialConnectionConfig

async def main():
    vsp = VirtualSerialPair()
    vsp.start()

    server_config = ModbusSerialConnectionConfig(vsp.serial_ports[0])
    client_config = ModbusSerialConnectionConfig(vsp.serial_ports[1])

    server = RS485Server(server_config)
    await server.start()

    client = RS485Client(client_config, address=1, label="My RS485 Device")
    data = await client.read_registers(0, count=10)
    print(f"Registers payload: {data}")
    
    await client.write_register_float(register=0, value=3.14159, factor=100)
    data = await client.read_registers(0, count=10)
    print(f"Registers payload: {data}")

    value = await client.read_register_float(register=0, factor=100)
    print(f"Read value: {value}")

    await server.stop()
    vsp.stop()

if __name__ == "__main__":
    asyncio.run(main())

Contribution

We welcome contributions to the project! Whether it's bug fixes, feature enhancements, or documentation improvements, your input is valuable. Please feel free to submit pull requests or open issues to discuss potential changes.

License

This project is licensed under the MIT License. For more details, please refer to the LICENSE file included in the repository.