# Can't connect to /dev/ttyUSB0

**URL:** <https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945>\
**Category:** Bugs and troubleshooting\
**Created:** [March 13, 2024, 3:14am UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945 "2024-03-13T03:14:31Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![deviance](https://forum.realdash.net/user_avatar/forum.realdash.net/deviance/32/579_2.png) [@deviance](https://forum.realdash.net/u/deviance)\
**Post date:** [March 13, 2024, 3:14am UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945/1 "2024-03-13T03:14:32Z")

</div>

Hi.  
I using cananalyzer and it’s can’t connect to it.  
Not with root not with user not as dialout group.  
with screen it works.  
Under Windows works.

```auto
[368.745946] usb 1-1.1: new full-speed USB device number 5 using xhci_hcd
[368.852197] usb 1-1.1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice=81.33
[368.852271] usb 1-1.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[368.852290] usb 1-1.1: Product: USB Serial
[368.856992] ch341 1-1.1:1.0: ch341-uart converter detected
[368.862415] usb 1-1.1: ch341-uart converter now attached to ttyUSB0

```

Anybody got this issue nowdays?

Thanks

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<div class="post-metadata">

**Author:** ![sergiomedinablanco](https://forum.realdash.net/letter_avatar_proxy/v4/letter/s/9fc29f/32.png) [@sergiomedinablanco](https://forum.realdash.net/u/sergiomedinablanco)\
**Post date:** [March 13, 2024, 5:35am UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945/2 "2024-03-13T05:35:16Z")

</div>

Do you install drivers?  
and autorize chmod +x

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<div class="post-metadata">

**Author:** ![deviance](https://forum.realdash.net/user_avatar/forum.realdash.net/deviance/32/579_2.png) [@deviance](https://forum.realdash.net/u/deviance)\
**Post date:** [March 13, 2024, 2:10pm UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945/3 "2024-03-13T14:10:19Z")

</div>

What driver is it need and why need +x?

`crw-rw---- 1 root dialout 188, 0 Mar 13 03:49 /dev/ttyUSB0`  
`Bus 001 Device 003: ID 1a86:7523 QinHeng Electronics CH340 serial converter`

Reinstalled drivers, nothing changed

```auto
[33.169601] usb 1-1.3: new full-speed USB device number 3 using xhci_hcd
[33.275533] usb 1-1.3: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice=81.33
[33.275570] usb 1-1.3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[33.275587] usb 1-1.3: Product: USB Serial
[33.348194] usbcore: registered new interface driver usbserial_generic
[33.348267] usbserial: USB Serial support registered for generic
[33.352937] usbcore: registered new interface driver ch341
[33.353059] usbserial: USB Serial support registered for ch341-uart
[33.353216] ch341 1-1.3:1.0: ch341-uart converter detected
[33.364677] usb 1-1.3: ch341-uart converter now attached to ttyUSB0

```

I feel like this is something RealDash problem because at CAN Monitor it works. Sometimes timeouts…

@realdashdev

 ![Screenshot 2024-03-13 184759](https://forum.realdash.net/uploads/default/original/2X/c/c2ee1315bf563c959b6fc1c14ff420c6e5fce848.png)

If not sending anything for a while:  
 ![Screenshot 2024-03-13 184835](https://forum.realdash.net/uploads/default/original/2X/a/a63ab2a46be9bf003c5fe036b125f3583b6e7b31.png)

on the main dash still getting  
 ![Screenshot 2024-03-13 184919](https://forum.realdash.net/uploads/default/original/2X/d/df47c9f8891d18a45d0400e650d3f6ff105c82af.png)

Looks like RealDash have timout problem.

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<div class="post-metadata">

**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [March 14, 2024, 10:26am UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945/4 "2024-03-14T10:26:32Z")

</div>

Timeout is normal when there is no data from CAN bus for a few seconds.

Don’t know really what the problem could be. We use Seeedstudio CAN adapter on 2M baud on Windows and Linux daily with no issues.

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<div class="post-metadata">

**Author:** ![deviance](https://forum.realdash.net/user_avatar/forum.realdash.net/deviance/32/579_2.png) [@deviance](https://forum.realdash.net/u/deviance)\
**Post date:** [March 14, 2024, 7:07pm UTC](https://forum.realdash.net/t/cant-connect-to-dev-ttyusb0/4945/5 "2024-03-14T19:07:28Z")

</div>

I think it works but gives me bad information. Connecting to /dev/ttyUSB0 (interface) is not same as Waiting Canbus data. I thought there is problem with the interface but not. It’s just waiting for Canbus message.