# SDSS-V Modbus PCL library
[](https://sdss-drift.readthedocs.io/en/latest/?badge=latest)
[](https://github.com/psf/black)
[](https://github.com/sdss/drift/actions/workflows/test.yml)
[](https://codecov.io/gh/sdss/drift)
This library provides an asynchronous interface with modbus devices over a TCP ethernet controller (such as [this one](https://www.wago.com/us/controllers-bus-couplers-i-o/controller-modbus-tcp/p/750-862)) and control of the connected I/O modules. The code is a relatively thin wrapper around [Pymodbus](http://riptideio.github.io/pymodbus/) with the main feature being that it's possible to define a PLC controller and a complete set of modules as a YAML configuration file which can then be loaded. It also provides convenience methods to read and write to the I/O modules and to convert the read values to physical units.
This code is mostly intended to interface with the SDSS-V [FPS](https://www.sdss.org/future/technology/) electronic boxes but is probably general enough for other uses. It's originally based on Rick Pogge's [WAGO code](https://github.com/sdss/FPS/tree/master/WAGO).
## Installation
To install, run
```console
pip install sdss-drift
```
To install from source, git clone or download the code, navigate to the root of the downloaded directory, and do
```console
pip install .
```
`sdss-drift` uses [Poetry](https://poetry.eustace.io/) for development. To install it in development mode do
```console
poetry install -E docs
```
## Documentation
Refer to the Read the Docs [documentation](https://sdss-drift.readthedocs.io/en/latest) for more details.
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