# Issue with Automation API (MSO device, 2.4.44, Apple Silicon) **URL:** \ **Category:** Logic 2 Software\ **Created:** [June 18, 2026, 8:22pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755 "2026-06-18T20:22:55Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![yi\_han](https://avatars.discourse-cdn.com/v4/letter/y/d07c76/32.png) [@yi\_han](https://discuss.saleae.com/u/yi_han)\ **Post date:** [June 18, 2026, 8:22pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/1 "2026-06-18T20:22:55Z")
Hi, I am trying to do a get\_device() using Automation API for MSO device: I am on version 2.4.44, MacOS host with Apple Silion. Automation is enabled, server address [http://127.0.0.1:10430](http://127.0.0.1:10430) I am using the following cmds: % python3 -m pip install logic2-automation --quiet % python3 -c “from saleae import automation; m=automation.Manager.connect(port=10430); print(m.get\_devices())” INFO:saleae.automation.manager:sub ChannelConnectivity.IDLE INFO:saleae.automation.manager:sub ChannelConnectivity.CONNECTING INFO:saleae.automation.manager:sub ChannelConnectivity.READY It hangs at this point Any ideas why? Thanks in advance for your help! ---
**Author:** ![yi\_han](https://avatars.discourse-cdn.com/v4/letter/y/d07c76/32.png) [@yi\_han](https://discuss.saleae.com/u/yi_han)\ **Post date:** [June 18, 2026, 8:37pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/2 "2026-06-18T20:37:14Z")
Note that if I swap MSO with Logic Pro 16 (No change in host HW/SW), I am able to get the device: % python3 -c “from saleae import automation; m=automation.Manager.connect(port=10430); print(m.get\_devices())” INFO:saleae.automation.manager:sub ChannelConnectivity.IDLE INFO:saleae.automation.manager:sub ChannelConnectivity.CONNECTING INFO:saleae.automation.manager:sub ChannelConnectivity.READY [DeviceDesc(device\_id=‘5A70BBAA8F54B51’, device\_type=\, is\_simulation=False)] For MSO, it just printed an empty string: INFO:saleae.automation.manager:sub ChannelConnectivity.IDLE INFO:saleae.automation.manager:sub ChannelConnectivity.CONNECTING INFO:saleae.automation.manager:sub ChannelConnectivity.READY [] ---
**Author:** ![timreyes](https://yyz2.discourse-cdn.com/flex030/user_avatar/discuss.saleae.com/timreyes/32/108_2.png) [@timreyes](https://discuss.saleae.com/u/timreyes)\ **Post date:** [June 24, 2026, 9:54pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/3 "2026-06-24T21:54:41Z")
@yi_han Sorry for the trouble with that! For Logic MSO automation, you will need to use the MSO API linked below: > **[Getting Started - Saleae API Documentation](https://docs.saleae.com/msoapi/guides/getting_started)** The Automation API [linked here](https://saleae.github.io/logic2-automation/getting_started.html) (where `get_devices()` comes from) is not compatible with Logic MSO. ---
**Author:** ![yi\_han](https://avatars.discourse-cdn.com/v4/letter/y/d07c76/32.png) [@yi\_han](https://discuss.saleae.com/u/yi_han)\ **Post date:** [June 24, 2026, 10:37pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/4 "2026-06-24T22:37:01Z")
Hi Tim, Thanks a lot for the information! Let me try it and get back to you if I need more help. —yi ---
**Author:** ![yi\_han](https://avatars.discourse-cdn.com/v4/letter/y/d07c76/32.png) [@yi\_han](https://discuss.saleae.com/u/yi_han)\ **Post date:** [July 8, 2026, 6:33pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/5 "2026-07-08T18:33:50Z")
Hi Tim, Need your help here: After running cmd: “pip3 install saleae-mso-api --extra-index-url [https://downloads.saleae.com/pypi/](https://downloads.saleae.com/pypi/)” I am only getting a defensive package. Any idea why? Thanks a lot! % pip3 show saleae-mso-api Name: saleae-mso-api Version: 0.0.1 Summary: Defensive package-name reservation notice for a potential supply-chain risk. Home-page: [https://bluebear.io](https://bluebear.io) Author: Author-email: License: SEE NOTICE.md Location: /Users/yi\_han/Library/Python/3.9/lib/python/site-packages Requires: Required-by: ---
**Author:** ![yi\_han](https://avatars.discourse-cdn.com/v4/letter/y/d07c76/32.png) [@yi\_han](https://discuss.saleae.com/u/yi_han)\ **Post date:** [July 8, 2026, 8:54pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/6 "2026-07-08T20:54:10Z")
Hi, I am able to install it now (virtual environment helped) % uv pip show saleae\_mso\_api Name: saleae-mso-api Version: 0.4.0 Location: ~/.venv/lib/python3.11/site-packages Requires: numpy, psutil, pyusb Required-by: But encounter a new issue when running the sample code from [Getting Started - Saleae API Documentation](https://docs.saleae.com/msoapi/guides/getting_started) % .venv/bin/python sample.py Traceback (most recent call last): File “~/sample.py”, line 5, in ``` mso = mso_api.MSO(serial_number="7B33M") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ``` File “~/.venv/lib/python3.11/site-packages/saleae/mso\_api/mso\_device.py”, line 40, in \__init_\_ ``` self.wrapper = wrapper or MsoWrapper(serial_number) ^^^^^^^^^^^^^^^^^^^^^^^^^ ``` File “.venv/lib/python3.11/site-packages/saleae/mso\_api/wrapper.py”, line 136, in \__init_\_ ``` if proc.name() == get_binary_tool_path().name: ^^^^^^^^^^^^^^^^^^^^^^ ``` File “~/.venv/lib/python3.11/site-packages/saleae/mso\_api/wrapper.py”, line 62, in get\_binary\_tool\_path ``` path = repo_root / "bin" / TO_PLATFORM_DIR\[platform.system()\] / f"mso_data_recorder{suffix}" \~\~\~\~\~\~\~\~\~\~\~\~\~\~\~^^^^^^^^^^^^^^^^^^^ ``` KeyError: ‘Darwin’ Exception ignored in: \ Traceback (most recent call last): File “~/.venv/lib/python3.11/site-packages/saleae/mso\_api/mso\_device.py”, line 104, in \__del_\_ ``` self.close() ``` File “~/.venv/lib/python3.11/site-packages/saleae/mso\_api/mso\_device.py”, line 101, in close ``` self.wrapper.close() ^^^^^^^^^^^^ ``` AttributeError: ‘MSO’ object has no attribute ‘wrapper’ I am on macOS 15.6 Thanks for any suggestions. ---
**Author:** ![timreyes](https://yyz2.discourse-cdn.com/flex030/user_avatar/discuss.saleae.com/timreyes/32/108_2.png) [@timreyes](https://discuss.saleae.com/u/timreyes)\ **Post date:** [July 15, 2026, 8:25pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/7 "2026-07-15T20:25:55Z")
@yi_han Glad to hear you were able to install it successfully! We’ll look into the new issue you are running into. ---
**Author:** ![markgarrison](https://yyz2.discourse-cdn.com/flex030/user_avatar/discuss.saleae.com/markgarrison/32/23_2.png) [@markgarrison](https://discuss.saleae.com/u/markgarrison)\ **Post date:** [July 16, 2026, 10:32pm UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/8 "2026-07-16T22:32:33Z")
Hi @yi_han, We just tried reproducing your issue, and we managed to find a different serious issue, oddly enough, also MacOS specific. We’ve internally fixed it and will ship it as soon as we can push it through testing. The error you’re seeing, `KeyError: ‘Darwin’` sounds a lot like you might be using a much older version of our MSO API, from before we added MacOS support. The object `TO_PLATFORM_DIR` does have a key called “Darwin” in it, which we added in version 0.5.2, in October of 2025. In the meantime, could you test it out on your machine? You can download it here: > **[Dropbox](https://www.dropbox.com/scl/fi/0mfjxd2pykba694gptlgp/saleae_mso_api-0.5.8-py3-none-any.whl.zip?rlkey=6iw9abae8rtlcu16z5u8zjm3e&st=dw8d6gmz&dl=0)** That’s a zip file that you can decompress to get the wheel file, `saleae_mso_api-0.5.8-py3-none-any.whl`. Basic testing: ```auto mkdir mso-api-test cd mso-api-test python -m venv .venv source .venv/bin/activate pip install ../saleae_mso_api-0.5.8-py3-none-any.whl # copy and paste in the sample script here. python sample.py ``` Sample script taken from here: [Getting Started - Saleae API Documentation](https://docs.saleae.com/msoapi/guides/getting_started) ```py from pathlib import Path import numpy as np from saleae import mso_api mso = mso_api.MSO() capture_config = mso_api.CaptureConfig( enabled_channels=[mso_api.AnalogChannel(channel=0, name="clock")], analog_settings=mso_api.AnalogSettings(sample_rate=100e6), capture_settings=mso_api.TimedCapture(capture_length_seconds=0.1), ) for n in range(3): save_dir = Path('my-captures') / f'{n:02d}' capture = mso.capture(capture_config, save_dir=save_dir) avg_voltage = np.mean(capture.analog_data["clock"].voltages) print(f"Capture {n:02d} in {save_dir} avg voltage: {avg_voltage:.3f} V") ``` The expected output should look like this: ```auto Capture 00 in my-captures/00 avg voltage: -0.018 V Capture 01 in my-captures/01 avg voltage: -0.016 V Capture 02 in my-captures/02 avg voltage: -0.016 V ``` If your MSO is not plugged in, you will get this: ```auto Mso not found retcode=1 ``` ---
**Author:** ![markgarrison](https://yyz2.discourse-cdn.com/flex030/user_avatar/discuss.saleae.com/markgarrison/32/23_2.png) [@markgarrison](https://discuss.saleae.com/u/markgarrison)\ **Post date:** [July 31, 2026, 3:23am UTC](https://discuss.saleae.com/t/issue-with-automation-api-mso-device-2-4-44-apple-silicon/3755/9 "2026-07-31T03:23:43Z")
Hello, The issue I originally reproduced was fixed and just shipped in 0.5.8. I had installed it with pip, so I updated it like so: ```auto pip install --upgrade saleae-mso-api --extra-index-url https://downloads.saleae.com/pypi/ ``` Please let me know if you have any issues with it!