# CAN bus connection

**URL:** <https://community.ecumaster.com/t/can-bus-connection/6020>\
**Category:** GENERAL\
**Created:** [June 15, 2026, 2:18pm UTC](https://community.ecumaster.com/t/can-bus-connection/6020 "2026-06-15T14:18:28Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Cubas2001](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@Cubas2001](https://community.ecumaster.com/u/Cubas2001)\
**Post date:** [June 15, 2026, 2:18pm UTC](https://community.ecumaster.com/t/can-bus-connection/6020/1 "2026-06-15T14:18:28Z")

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Hi everyone, i have a question about CAN bus connection. How to connect the USB to can to PMU 16? How to create the CAN bus ring between emu black, pmu 16, adu, keyboard and USB to CAN? Thanks

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**Author:** ![michal.kowalski](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/michal.kowalski/32/36_2.png) [@michal.kowalski](https://community.ecumaster.com/u/michal.kowalski)\
**Post date:** [June 15, 2026, 2:48pm UTC](https://community.ecumaster.com/t/can-bus-connection/6020/2 "2026-06-15T14:48:49Z")

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You should start by reading the PMU Manual. Especially chapters 3.1, 3.2 and 3.3 [https://www.ecumaster.com/files/PMU/PMU\_Manual.pdf](https://www.ecumaster.com/files/PMU/PMU_Manual.pdf).

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**Author:** ![Cubas2001](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@Cubas2001](https://community.ecumaster.com/u/Cubas2001)\
**Post date:** [June 15, 2026, 2:54pm UTC](https://community.ecumaster.com/t/can-bus-connection/6020/3 "2026-06-15T14:54:19Z")

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Ok, thanks for the help

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**Author:** ![Cubas2001](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@Cubas2001](https://community.ecumaster.com/u/Cubas2001)\
**Post date:** [June 15, 2026, 4:04pm UTC](https://community.ecumaster.com/t/can-bus-connection/6020/4 "2026-06-15T16:04:02Z")

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![Screenshot_2026-06-15-18-02-01-751_com.android.chrome-edit](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/3/3bff4e678eb0811647b7ed824d2d441146b12d76.jpeg)but the +12v switch Is the keyboard right?

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**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [June 16, 2026, 4:10am UTC](https://community.ecumaster.com/t/can-bus-connection/6020/5 "2026-06-16T04:10:47Z")

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yes. In the example you’ve highlighted the PMU is also powering the keypad.  
The USB-to-CAN is bottom left connected to a laptop. It does not need 12V power, it gets power from the USB connection

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<div class="post-metadata">

**Author:** ![Cubas2001](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@Cubas2001](https://community.ecumaster.com/u/Cubas2001)\
**Post date:** [June 16, 2026, 5:12am UTC](https://community.ecumaster.com/t/can-bus-connection/6020/6 "2026-06-16T05:12:04Z")

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Ok thanks for the help