PI GCS2 stage controller (PyMoDAQ PIWrapper) — device market

Install

Three ways to run this device. Each one serves its fake backend: no instrument, no simulator install and no upstream checkout.

OpenAI4S (one command)

shell

openai4s lab add labs/pymodaq__pymodaq_plugins_physik_instrumente

Installs the device into the OpenAI4S Lab on its fake backend and starts it. First time? See setup below.

Or, in the workbench, open the Lab tab → Market → Install.

Standalone MHS endpoint

shell

git clone --depth 1 https://github.com/PKU-YuanGroup/OpenMHS.git && cd OpenMHS
PYTHONPATH=MHS/sdk/src python3 -m mhs serve labs/pymodaq__pymodaq_plugins_physik_instrumente --port 7400
# in a second terminal, from the same directory:
PYTHONPATH=MHS/sdk/src python3 -m mhs describe --endpoint http://127.0.0.1:7400

Serves the device as an MHS endpoint on port 7400 from an OpenMHS clone (Python 3.10 or later, standard library only); describe prints what it offers.

Any MCP host (Claude Desktop, Cursor, …)

mcp configuration

{
  "mcpServers": {
    "pymodaq-plugins-physik-instrumente": {
      "command": "python3",
      "args": [
        "-m",
        "mhs",
        "serve",
        "labs/pymodaq__pymodaq_plugins_physik_instrumente",
        "--mcp"
      ],
      "env": {
        "PYTHONPATH": "/path/to/OpenMHS/MHS/sdk/src"
      }
    }
  }
}

Add this server to the host's MCP configuration and replace /path/to/OpenMHS with the path of your OpenMHS clone. The host starts the server and talks to it on stdin and stdout.

What it does

Measures

identity
axis_names
axis_units
positions
referenced
servo_enabled

Adjusts

Nothing declared.

Actions

move_absolute: Move one axis to an absolute position with the native move_absolute() and report the position the controller reads back
move_relative: Move one axis by a relative step with the native move_relative() and report the position the controller reads back
home_axis: Home one axis with the native move_home() and report whether the controller then reports it as referenced
stop_motion: Stop all motion with the native stop() (the controller's StopAll command). It takes no input because the native stop takes no profile or position

Names as the driver declares them. Units, limits and the safety declaration are in the package's REFERENCE.md.

First-time setup

The OpenAI4S workbench with the OpenMHS lab, from a source checkout:

shell

# OpenAI4S workbench with the OpenMHS lab (source checkout)
git clone --recursive https://github.com/PKU-YuanGroup/OpenAI4S.git
cd OpenAI4S && ./setup.sh && source .venv/bin/activate
openai4s lab add labs/pymodaq__pymodaq_plugins_physik_instrumente
openai4s serve        # open the Lab tab

The standalone endpoint and the MCP server need only an OpenMHS clone and Python 3.10 or later. More in the market's getting-started guide and on the OpenAI4S host page.

Source and evidence

Upstream: pymodaq/pymodaq_plugins_physik_instrumente
Pinned commit: 6fb8d954c432
Licence: MIT
Stars: 2
Evidence: contract_checked on the fake backend
Backends: fake, hardware

The driver package MHS/drivers/labs/pymodaq__pymodaq_plugins_physik_instrumente wraps the upstream code at the pinned commit. Its REFERENCE.md documents the full contract: every value, action, unit, limit and the safety declaration.