# Issues when setting up 2nd MCU

**URL:** <https://klipper.discourse.group/t/issues-when-setting-up-2nd-mcu/11702>\
**Category:** General Discussion\
**Created:** [November 19, 2023, 12:44pm UTC](https://klipper.discourse.group/t/issues-when-setting-up-2nd-mcu/11702 "2023-11-19T12:44:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KiwiHuman](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/kiwihuman/32/6759_2.png) [@KiwiHuman](https://klipper.discourse.group/u/KiwiHuman)\
**Post date:** [November 19, 2023, 12:44pm UTC](https://klipper.discourse.group/t/issues-when-setting-up-2nd-mcu/11702/1 "2023-11-19T12:44:56Z")

</div>

### Basic Information:

Printer Model: SOVOL SV06  
 MCU / Printerboard: Sv06 default + GT2560(not yet working)  
 `klippy.log`  
[klippy.log](https://klipper.discourse.group/uploads/short-url/hmymOryp2p4Hcowk7oaztONMz8x.log) (315.5 KB)

### Describe your issue:

I am trying to setup a 2nd MCU to control an enclosure heater. I have a GT2560 that ,whilst it had a fault with controlling the stepper motors, has no issues with the heater/thermistor connections i will require using. whilst following the klipper flashing instructions on [Installation - Klipper documentation](https://www.klipper3d.org/Installation.html) I encountered my problem. whilst running ls /dev/serial/by-id/\* i get the following output

```auto
klipper@Klipper-SV06:~$ ls /dev/serial/by-id/*
/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
klipper@Klipper-SV06:~$ 

```

this is the same regardless of what USB devices are attached to the laptop i am using to run kipper I only see one device listed. I have tried with just the printer connected, just the MCU i want to add, just the camera I use, the printer and the camera and the new MCU and the camera. Because of this I am unable to differentiate between the different MCUs for configuration.

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<div class="post-metadata">

**Author:** ![KiwiHuman](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/kiwihuman/32/6759_2.png) [@KiwiHuman](https://klipper.discourse.group/u/KiwiHuman)\
**Post date:** [November 19, 2023, 4:07pm UTC](https://klipper.discourse.group/t/issues-when-setting-up-2nd-mcu/11702/2 "2023-11-19T16:07:38Z")

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UPDATE: I figures out that i can define the MCUs with /dev/serial/by-path instead of /dev/serial/by-id and this fixed my issue.

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [December 20, 2023, 2:08am UTC](https://klipper.discourse.group/t/issues-when-setting-up-2nd-mcu/11702/3 "2023-12-20T02:08:06Z")

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