# Point-to-Multipoint Setup with Microhard Radio

## Sample Wiring Diagram

<figure><img src="https://2367252986-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLIgtGDAvVGkCKGOJb1bR%2Fuploads%2FZkWCCqEedKIPzncgveQO%2FPoint-to-Multipoint.jpg?alt=media&#x26;token=708e57ab-6b9b-4357-bcbe-9c6b5defe53b" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Note that the above Diagram shows RTK connection, but the telemetry connections apply to normal GPS as well. &#x20;
{% endhint %}

## Point to Multipoint Connection Using Microhard Radio

### Telemetry Radio Setup

First, Select one of the Radios as the Master, and the other Radios as the Remote. Use the [Pico configurator](https://docs.holybro.com/radio/microhard-radio/download) to set the Master to PMP Master mode, and change the baud rate to 57600. As shown in the figure below:&#x20;

1. Select PMP Master&#x20;
2. Click Default Unit&#x20;
3. Select 57600 baud rate&#x20;
4. Click PGM/Save.

<figure><img src="https://2367252986-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLIgtGDAvVGkCKGOJb1bR%2Fuploads%2FTF3lgo8aSqDgmktDqwPN%2FMicrohard_Point-to-Multipoint.png?alt=media&#x26;token=1f7b494f-73f5-45a1-8239-e417ab312fbb" alt=""><figcaption><p>Pico Configuator - Master</p></figcaption></figure>

Then, set all the Remote Radios to PMP Remote mode, and change the baud rate to 57600. As shown below:&#x20;

1. Select PMP Remote&#x20;
2. Click Default Unit&#x20;
3. Confirm that the Network Address is consistent with the Master&#x20;
4. Set a unique  Unit Address different for each Remote Radio.&#x20;
5. Select 57600 baud rate&#x20;
6. Click PGM/Save.

<figure><img src="https://2367252986-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLIgtGDAvVGkCKGOJb1bR%2Fuploads%2FujxPMTNRTBVUxpHsiuiz%2FMicrohard_Point-to-Multipoint_Remote.png?alt=media&#x26;token=4216e7af-dff9-4604-ad24-0504ce123eef" alt=""><figcaption><p>Pico Configuator - Remote</p></figcaption></figure>

### Flight Controller Settings

Connect the flight controller via USB and set an ID for each flight controller that is different from other flight controllers.

**For PX4 firmware**, the MAV\_SYS\_ID parameter should be set

**For Ardupilot firmware**, the SYSID\_THISMAV parameter should be set

<figure><img src="https://lh6.googleusercontent.com/PEN7RJls8xOHfZDPp5cFcTqejrZJTmJgnbjueaWf4E3ZZQauMH4I5h4Ijfbwa1MEj7UBOBJx5hYGuuX5yA6DcAn1nUsIsc22fvARdA68d8VQ6lkuQ9_RCEtD6oSEUmOe6zbdGJo64wNkRdz9A8-bHQ" alt=""><figcaption></figcaption></figure>

Use the Master Radio to connect to the ground station (QGC/MissionPlanner), and the Remote Radio to connect to the flight controllers. \
\
If using RTK system, wait for the Base Survey-in to distribute the RTCM data of a Base to multiple Rover after powering on.&#x20;

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