# Connect companion computer to Pixhawk 4 mini with FDTI

**URL:** <https://discuss.px4.io/t/connect-companion-computer-to-pixhawk-4-mini-with-fdti/27834>\
**Category:** PX4 Autopilot\
**Created:** [June 9, 2022, 1:17am UTC](https://discuss.px4.io/t/connect-companion-computer-to-pixhawk-4-mini-with-fdti/27834 "2022-06-09T01:17:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![WILLIAM\_DONG](https://discuss.px4.io/user_avatar/discuss.px4.io/william_dong/32/10760_2.png) [@WILLIAM\_DONG](https://discuss.px4.io/u/WILLIAM_DONG)\
**Post date:** [June 9, 2022, 1:17am UTC](https://discuss.px4.io/t/connect-companion-computer-to-pixhawk-4-mini-with-fdti/27834/1 "2022-06-09T01:17:37Z")

</div>

Hi guys, I am currently trying to build the communication between a Pixhawk 4 mini and an Up Core companion computer using a FDTI following this guide: [https://docs.px4.io/master/en/companion\_computer/pixhawk\_companion.html](https://docs.px4.io/master/en/companion_computer/pixhawk_companion.html).

The computer setup is done with ROS2 and already passed sanity check. Since there is no telem 2 port for Pixhawk mini, we use QGroundControl to change necessary parameter for telem 1 port:  
[MAV\_1\_CONFIG] = `TELEM 1`  
[MAV\_1\_MODE] = `Onboard`  
[MAV\_1\_RATE] = `80000` Bytes/s  
[MAV\_1\_FORWARD] = `True`  
[SER\_TEL1\_BAUD] = `921600` baud.

For the FDTI, we connect it with RX/TX/CTS/RTX/GND following the guide.

However, when I try to see usb connected, I still can’t see Pixhawk on the usb list. I try to download a FDTI driver but I am lost in those APIs.

Should I actually launch something to able to detect the FC? What should I do now?