# Ghost atto Sentinel

Source: https://forum.modalai.com/topic/4180/ghost-atto-sentinel
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-02-15 13:41:44 UTC by valvarez
Replies: 5 · Views: 906

## valvarez · 2025-02-15 13:41:44 UTC

Hello everyone.
I need to release the RC UART on J19 (Ghost atto of the Sentinel) to connect an IO Board. Can the Ghost atto be SBUS and UART at the same time or are they different devices?
If it is SBUS I know that I could connect it to J3 of the IO Board, but if it is UART, could it go in the ttyHS2 for example?

Thank 

![7f635389-588f-4343-b213-5e17b469139e-imagen.png](https://forum.modalai.com/assets/uploads/files/1739626896474-7f635389-588f-4343-b213-5e17b469139e-imagen.png)

## Reply by Eric Katzfey (ModalAI staff) · 2025-02-16 16:07:37 UTC

@valvarez SBUS has different signal qualities so cannot be used on J19. The IO board does have SBUS capability. With UART you should be able to use an apps processor UART like ttyHS<x>

## Reply by valvarez · 2025-02-16 20:09:42 UTC (in reply to Eric Katzfey)

@Eric-Katzfey How should I redirect it? From what you have told me in other threads, my interpretation says that right now it is pointing to slpi-uart-7. Would it just be a matter of changing the 7?
![02c47be0-1f83-4fc6-8bdb-f64395b6fdbe-imagen.png](https://forum.modalai.com/assets/uploads/files/1739736578938-02c47be0-1f83-4fc6-8bdb-f64395b6fdbe-imagen.png)

Edit: In my head it sounded simpler
![8cc18b7f-210c-4da0-bfab-0be0dfee6c20-imagen.png](https://forum.modalai.com/assets/uploads/files/1739737132294-8cc18b7f-210c-4da0-bfab-0be0dfee6c20-imagen.png)

## Reply by Eric Katzfey (ModalAI staff) · 2025-02-16 23:17:05 UTC (in reply to valvarez)

@valvarez No, because anything with `qshell` in front of it runs on the DSP. You want to use the serial port on the apps processor so remove the `qshell`.

## Reply by valvarez · 2025-02-16 23:33:17 UTC (in reply to Eric Katzfey)

@Eric-Katzfey 
Thank you very much for the clarification.
What can it be?

![275be012-678f-43ec-b901-9b4771be3dfd-imagen.png](https://forum.modalai.com/assets/uploads/files/1739748738919-275be012-678f-43ec-b901-9b4771be3dfd-imagen.png) 

![2e7f835e-3a13-4c3a-8ca9-a29b0d9bc893-imagen.png](https://forum.modalai.com/assets/uploads/files/1739748766053-2e7f835e-3a13-4c3a-8ca9-a29b0d9bc893-imagen.png)

## Reply by Eric Katzfey (ModalAI staff) · 2025-02-17 15:58:01 UTC (in reply to valvarez)

@valvarez Sorry about that, but looks like that ghst_rc driver is specific to the DSP and cannot be used on the apps processor right now. I'm afraid the current build cannot support what you are looking to do without some changes. Probably best for you to put the receiver in SBUS mode and connect to the IO board.