# Async ModBus
[![Async Modbus][pypi-version]](https://pypi.python.org/pypi/async_modbus)
[![Python Versions][pypi-python-versions]](https://pypi.python.org/pypi/async_modbus)
[![CI Status][CI]](https://github.com/tiagocoutinho/async_modbus/actions/workflows/ci.yml)
![License][license]
[](https://github.com/pre-commit/pre-commit)
Asynchronous (as in python async/await) modbus python 3 client library.
A thin layer on on top of the venerable
[umodbus](https://github.com/AdvancedClimateSystems/uModbus) library providing
an object oriented client API.
async_modbus is async library agnostic. You should be able to use it with
[asyncio](https://docs.python.org/3/library/asyncio.html),
[curio](https://curio.rtfd.io), [trio](https://trio.rtfd.io) or
[anyio](https://anyio.rtfd.io).
It expects an object with the same interface as
[StreamReader](https://docs.python.org/3/library/asyncio-stream.html#streamreader)
and
[StreamWriter](https://docs.python.org/3/library/asyncio-stream.html#streamwriter)
so you may need to write a thin wrapper if you are not using asyncio.
The examples below show how to use it with curio.
Note: the `modbus_for_url()` relies on the
[connio](https://github.com/tiagocoutinho/connio) library which relies on
the asyncio event loop so you it's usage is limited to asyncio applications.
## Why another modbus library?
This library is not a re-implementation of the ModBus communication protocol.
You can view it instead as a complement to the
[umodbus](https://github.com/AdvancedClimateSystems/uModbus) library.
Here is what async_modbus provides on top of umodbus:
* Simple yet powerful object oriented API
* Convenient `modbus_for_url()` helper function. Type an URL and you're ready
to go.
* when appropriate, [numpy](https://numpy.org) arrays are used. It's usage not
only reduces the memory footprint and increases speed, but also makes it easy
for users to efficiently reformat data.
* Compatible with the [connio](https://github.com/tiagocoutinho/connio),
[sockio](https://github.com/tiagocoutinho/sockio) and
[serialio](https://github.com/tiagocoutinho/serialio) libraries which provide
transparent socket re-connection among other features.
## Installation
From within your favorite python environment type:
`$ pip install async_modbus`
Numpy will be used if installed. You can install it yourself, or include the optional dependency:
`$ pip install async_modbus[numpy]`
## Library
The core of the async_modbus library consists of a `modbus_for_url()` function
and the two classes `AsyncTCPClient` and `AsyncRTUClient`.
Here are some examples:
### asyncio examples
*simple TCP client*
```python
import asyncio
import numpy
from async_modbus import modbus_for_url
async def main():
client = modbus_for_url("tcp://localhost:15020")
values = numpy.array([1, 0, 1, 1]) # would also work with list<bool or int>
reply = await client.write_coils(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_coils(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
asyncio.run(main())
```
*RTU on local serial line with custom serial options*
```python
import asyncio
from async_modbus import modbus_for_url
async def main():
client = modbus_for_url("serial:///dev/ttyS0", {"baudrate":19200, "parity":"E"})
values = [1, 0, 1, 1]
reply = await client.write_coils(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_discrete_inputs(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
asyncio.run(main())
```
*RTU over remote serial line using RFC2217*
```python
import asyncio
from async_modbus import modbus_for_url
async def main():
client = modbus_for_url("rfc2217://moxa.acme.org:6610")
values = [1, 0, 1, 1]
reply = await client.write_coils(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_discrete_inputs(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
asyncio.run(main())
```
*asyncio TCP streams*
```python
import asyncio
import numpy
from async_modbus import AsyncTCPClient
async def main():
reader, writer = await asyncio.open_connection('localhost', 15020)
client = AsyncTCPClient((reader, writer))
values = numpy.array([0, 2**15 - 1, 10, 3, 32766])
reply = await client.write_registers(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_holding_registers(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
writer.close()
await writer.wait_closed()
asyncio.run(main())
```
*async serial line RTU using remote raw TCP*
```python
import asyncio
import numpy
from async_modbus import AsyncRTUClient
from serial_asyncio import open_serial_connection
async def main():
reader, writer = await open_serial_connection(url="socket://moxa.acme.org:6610")
client = AsyncRTUClient((reader, writer))
values = [0, 2**15 - 1, 10, 3, 32766]
reply = await client.write_registers(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_input_registers(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
writer.close()
await writer.wait_closed()
asyncio.run(main())
```
### curio examples
**curio TCP streams**
```python
import curio
from async_modbus import AsyncTCPClient
async def main():
sock = await curio.open_connection("0", 15020)
client = AsyncTCPClient(sock.as_stream())
values = [1, 0, 1, 1]
reply = await client.write_coils(slave_id=1, starting_address=1, values=values)
assert reply is len(values)
reply = await client.read_coils(slave_id=1, starting_address=1, quantity=len(values))
assert (reply == values).all()
await sock.close()
```
## Credits
### Development Lead
* Tiago Coutinho <coutinhotiago@gmail.com>
### Contributors
None yet. Why not be the first?
### Special thanks to
* [umodbus](https://github.com/AdvancedClimateSystems/uModbus)
* [numpy](https://numpy.org)
[pypi-python-versions]: https://img.shields.io/pypi/pyversions/async_modbus.svg
[pypi-version]: https://img.shields.io/pypi/v/async_modbus.svg
[pypi-status]: https://img.shields.io/pypi/status/async_modbus.svg
[license]: https://img.shields.io/pypi/l/async_modbus.svg
[CI]: https://github.com/tiagocoutinho/async_modbus/actions/workflows/ci.yml/badge.svg
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"description": "# Async ModBus\n\n[![Async Modbus][pypi-version]](https://pypi.python.org/pypi/async_modbus)\n[![Python Versions][pypi-python-versions]](https://pypi.python.org/pypi/async_modbus)\n[![CI Status][CI]](https://github.com/tiagocoutinho/async_modbus/actions/workflows/ci.yml)\n![License][license]\n[](https://github.com/pre-commit/pre-commit)\n\n\nAsynchronous (as in python async/await) modbus python 3 client library.\nA thin layer on on top of the venerable\n[umodbus](https://github.com/AdvancedClimateSystems/uModbus) library providing\nan object oriented client API.\n\nasync_modbus is async library agnostic. You should be able to use it with\n[asyncio](https://docs.python.org/3/library/asyncio.html),\n[curio](https://curio.rtfd.io), [trio](https://trio.rtfd.io) or\n[anyio](https://anyio.rtfd.io).\n\nIt expects an object with the same interface as\n[StreamReader](https://docs.python.org/3/library/asyncio-stream.html#streamreader)\nand\n[StreamWriter](https://docs.python.org/3/library/asyncio-stream.html#streamwriter)\nso you may need to write a thin wrapper if you are not using asyncio.\nThe examples below show how to use it with curio.\n\nNote: the `modbus_for_url()` relies on the\n[connio](https://github.com/tiagocoutinho/connio) library which relies on\nthe asyncio event loop so you it's usage is limited to asyncio applications.\n\n\n## Why another modbus library?\n\nThis library is not a re-implementation of the ModBus communication protocol.\nYou can view it instead as a complement to the\n[umodbus](https://github.com/AdvancedClimateSystems/uModbus) library.\n\nHere is what async_modbus provides on top of umodbus:\n\n* Simple yet powerful object oriented API\n* Convenient `modbus_for_url()` helper function. Type an URL and you're ready\n to go.\n* when appropriate, [numpy](https://numpy.org) arrays are used. It's usage not\n only reduces the memory footprint and increases speed, but also makes it easy\n for users to efficiently reformat data.\n* Compatible with the [connio](https://github.com/tiagocoutinho/connio),\n [sockio](https://github.com/tiagocoutinho/sockio) and\n [serialio](https://github.com/tiagocoutinho/serialio) libraries which provide\n transparent socket re-connection among other features.\n\n\n## Installation\n\nFrom within your favorite python environment type:\n\n`$ pip install async_modbus`\n\nNumpy will be used if installed. You can install it yourself, or include the optional dependency:\n\n`$ pip install async_modbus[numpy]`\n\n## Library\n\nThe core of the async_modbus library consists of a `modbus_for_url()` function\nand the two classes `AsyncTCPClient` and `AsyncRTUClient`.\n\nHere are some examples:\n\n### asyncio examples\n\n*simple TCP client*\n\n```python\nimport asyncio\n\nimport numpy\n\nfrom async_modbus import modbus_for_url\n\n\nasync def main():\n\n client = modbus_for_url(\"tcp://localhost:15020\")\n\n values = numpy.array([1, 0, 1, 1]) # would also work with list<bool or int>\n reply = await client.write_coils(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_coils(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n\nasyncio.run(main())\n```\n\n*RTU on local serial line with custom serial options*\n\n```python\nimport asyncio\n\nfrom async_modbus import modbus_for_url\n\n\nasync def main():\n\n client = modbus_for_url(\"serial:///dev/ttyS0\", {\"baudrate\":19200, \"parity\":\"E\"})\n\n values = [1, 0, 1, 1]\n reply = await client.write_coils(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_discrete_inputs(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n\nasyncio.run(main())\n```\n\n*RTU over remote serial line using RFC2217*\n\n```python\nimport asyncio\n\nfrom async_modbus import modbus_for_url\n\n\nasync def main():\n\n client = modbus_for_url(\"rfc2217://moxa.acme.org:6610\")\n\n values = [1, 0, 1, 1]\n reply = await client.write_coils(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_discrete_inputs(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n\nasyncio.run(main())\n```\n\n*asyncio TCP streams*\n\n```python\nimport asyncio\n\nimport numpy\n\nfrom async_modbus import AsyncTCPClient\n\n\nasync def main():\n\n reader, writer = await asyncio.open_connection('localhost', 15020)\n client = AsyncTCPClient((reader, writer))\n\n values = numpy.array([0, 2**15 - 1, 10, 3, 32766])\n reply = await client.write_registers(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_holding_registers(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n writer.close()\n await writer.wait_closed()\n\n\nasyncio.run(main())\n```\n\n*async serial line RTU using remote raw TCP*\n\n```python\nimport asyncio\n\nimport numpy\n\nfrom async_modbus import AsyncRTUClient\nfrom serial_asyncio import open_serial_connection\n\n\nasync def main():\n\n reader, writer = await open_serial_connection(url=\"socket://moxa.acme.org:6610\")\n client = AsyncRTUClient((reader, writer))\n\n values = [0, 2**15 - 1, 10, 3, 32766]\n reply = await client.write_registers(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_input_registers(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n writer.close()\n await writer.wait_closed()\n\n\nasyncio.run(main())\n```\n\n### curio examples\n\n**curio TCP streams**\n\n```python\nimport curio\nfrom async_modbus import AsyncTCPClient\n\n\nasync def main():\n\n sock = await curio.open_connection(\"0\", 15020)\n client = AsyncTCPClient(sock.as_stream())\n\n values = [1, 0, 1, 1]\n reply = await client.write_coils(slave_id=1, starting_address=1, values=values)\n assert reply is len(values)\n\n reply = await client.read_coils(slave_id=1, starting_address=1, quantity=len(values))\n assert (reply == values).all()\n\n await sock.close()\n```\n\n\n## Credits\n\n### Development Lead\n\n* Tiago Coutinho <coutinhotiago@gmail.com>\n\n### Contributors\n\nNone yet. Why not be the first?\n\n### Special thanks to\n\n* [umodbus](https://github.com/AdvancedClimateSystems/uModbus)\n* [numpy](https://numpy.org)\n\n\n[pypi-python-versions]: https://img.shields.io/pypi/pyversions/async_modbus.svg\n[pypi-version]: https://img.shields.io/pypi/v/async_modbus.svg\n[pypi-status]: https://img.shields.io/pypi/status/async_modbus.svg\n[license]: https://img.shields.io/pypi/l/async_modbus.svg\n[CI]: https://github.com/tiagocoutinho/async_modbus/actions/workflows/ci.yml/badge.svg\n\n\n",
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