# PH4 Mini - set UART port as Telemetry 2 port

**URL:** <https://discuss.px4.io/t/ph4-mini-set-uart-port-as-telemetry-2-port/18388>\
**Category:** Pixhawk\
**Created:** [September 1, 2020, 10:58am UTC](https://discuss.px4.io/t/ph4-mini-set-uart-port-as-telemetry-2-port/18388 "2020-09-01T10:58:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mauro\_Gatti](https://discuss.px4.io/letter_avatar_proxy/v4/letter/m/e79b87/32.png) [@Mauro\_Gatti](https://discuss.px4.io/u/Mauro_Gatti)\
**Post date:** [September 1, 2020, 10:58am UTC](https://discuss.px4.io/t/ph4-mini-set-uart-port-as-telemetry-2-port/18388/1 "2020-09-01T10:58:36Z")

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Hi guys, i want to use my Holybro Micro OSD and mini Pix4 for FPV with my PH4 mini using Fatshark fpv google but i have an error on the display: “Waiting for Mavlink heartbeat”.

OSD is link to UART port because primary telemetru to GS is on Tel1 port.

How can i set UART port to became a Tel 2 port? Is it possible?

Waiting repaly!🙂

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**Author:** ![tomcattigerkkk](https://discuss.px4.io/user_avatar/discuss.px4.io/tomcattigerkkk/32/5068_2.png) [@tomcattigerkkk](https://discuss.px4.io/u/tomcattigerkkk)\
**Post date:** [May 6, 2021, 7:53am UTC](https://discuss.px4.io/t/ph4-mini-set-uart-port-as-telemetry-2-port/18388/2 "2021-05-06T07:53:06Z")

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If you mean the UART port (next to Tel1), I think it should be TELEM4