# Problems with serial connection on Mac

**URL:** <https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938>\
**Category:** PicoCalc\
**Created:** [June 10, 2025, 8:23pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938 "2025-06-10T20:23:00Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Lennart](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/lennart/32/11528_2.png) [@Lennart](https://forum.clockworkpi.com/u/Lennart)\
**Post date:** [June 10, 2025, 8:23pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/1 "2025-06-10T20:23:00Z")

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Hey,  
I am trying to connect the PicoCalc via USB C to my Mac.  
I see the device (_/dev/tty.usbmodem11401_) and I tried _minicom_, _screen_, and _tio_ (using 115200 baud).  
The programs connect, but then the connection is labeled as “offline”.

The keyboard is disabled – so the connection is detected by the PicoCalc.  
Any suggestions?

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**Author:** ![M57](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/m57/32/12528_2.png) [@M57](https://forum.clockworkpi.com/u/M57)\
**Post date:** [June 10, 2025, 8:57pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/2 "2025-06-10T20:57:59Z")

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Had the same problem, ended up just being the cable I was using.

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**Author:** ![Doctorfinlay](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/doctorfinlay/32/12583_2.png) [@Doctorfinlay](https://forum.clockworkpi.com/u/Doctorfinlay)\
**Post date:** [June 11, 2025, 7:57pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/3 "2025-06-11T19:57:32Z")

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I have the same issue- I used terminal to connect, it connects but then nothing, no cursor just a blank terminal screen. If I unplug the device it shows as disconnected, so it is definitely doing something. I am using a Pico 2W with the latest webmite build from this site.

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**Author:** ![Lennart](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/lennart/32/11528_2.png) [@Lennart](https://forum.clockworkpi.com/u/Lennart)\
**Post date:** [June 11, 2025, 8:03pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/4 "2025-06-11T20:03:12Z")

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I tried multiple cables, including the one that I have here running a keypad powered by a pico. But none of them worked.  
Anyone any other ideas?

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**Author:** ![BlairLeduc](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/blairleduc/32/11808_2.png) [@BlairLeduc](https://forum.clockworkpi.com/u/BlairLeduc)\
**Post date:** [June 11, 2025, 8:27pm UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/5 "2025-06-11T20:27:41Z")

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I do not have my PicoCalc yet, and I am not sure this helps, but there is the serial port on the pico (pins 1 and 2) that are connected to the USB-C port on the PicoCalc, and there is the virtual USB serial port on the micro-USB of the Pico. I am not sure which one webmite is expecting?

So, try either a USB-C to USB-C to the PicoCalc or USB-C to micro-USB to the Pico and see if either works.

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<div class="post-metadata">

**Author:** ![Lennart](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/lennart/32/11528_2.png) [@Lennart](https://forum.clockworkpi.com/u/Lennart)\
**Post date:** [June 13, 2025, 11:21am UTC](https://forum.clockworkpi.com/t/problems-with-serial-connection-on-mac/17938/6 "2025-06-13T11:21:58Z")

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Cannot say why it works now – but it does.

It’s the USB C port of the device you want to connect to.  
The Mini USB is only for flashing / updating the Pico.