# Error in VOXL mini 4 in 1 ESC diagram

Source: https://forum.modalai.com/topic/4366/error-in-voxl-mini-4-in-1-esc-diagram
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Posted: 2025-04-21 19:07:35 UTC by h3robotics
Replies: 3 · Views: 3203

## h3robotics · 2025-04-21 19:07:35 UTC

Hi,

I am having strange issues with the VOXL2. I had hooked it up with a 4-in-1 mini ESC using the diagram here: https://docs.modalai.com/images/d0014/CWD-D0014-4-CXX-M22-TX-REV2.jpg. It turns out there is an error on the way wiring is shown (see the red circle):

![voxl2-esc-connection.png](https://forum.modalai.com/assets/uploads/files/1745262052916-voxl2-esc-connection.png) 

With that wiring, I was unable to get the LTE v2 pro modem working. It was not being detected. I was also not able to get any battery info.

Now I have fixed the wiring as per the pinout of the connectors. But I am seeing the following issues:

- still I am not able to detect the LTE v2 modem.
- still no battery info. When I try to manually stop/start the "voxl_esc" driver in PX4 mavlink console, it gives me errors and fails to start.
- ADB over usb C does not work if the ESC UART connector J18 is not plugged into the VOXL 2.

Can you help me? I hope nothing is burnt/ broken due to the error in wiring above :(

## Reply by Alex Kushleyev (ModalAI staff) · 2025-04-25 03:51:09 UTC

@h3robotics The diagram has been fixed. Thank you for reporting it. 

https://docs.modalai.com/voxl2-d0014/

We will continue working on your issue in another thread.

Alex

## Reply by h3robotics · 2025-04-27 01:16:42 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev the RX and TX lines need to be swapped at the J18 connector as well, please :)

## Reply by Alex Kushleyev (ModalAI staff) · 2025-04-28 13:24:14 UTC (in reply to h3robotics)

@h3robotics , Thank you, you are right again. We will update!