# 4.4. Use the TTL port to connect and control

#### Scenario 1: Connect directly without using video & data Link equipment.

<figure><img src="/files/kvYMLt0qj6iufbiOQhDS" alt=""><figcaption></figcaption></figure>

#### Scenario 2: Connect via devices such as video & data Link, and use the TTL connection method for control.

<figure><img src="/files/3SFpphLqUmG6jDjXw1Mu" alt=""><figcaption></figcaption></figure>

#### After the connection is completed, perform image connection and control on YDlink.&#xD; Step 1. Chose the COM port and Baudrate 115200.&#xD; Step 2. Click the “Connect” botton to enable gimbal control.

<figure><img src="/files/TJpF4HRKYdmFEWd1cOqI" alt=""><figcaption></figcaption></figure>


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