# 4.4. Use the TTL port to connect and control

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

<figure><img src="https://1851866520-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWx9bMxy88NRLPUcOemU%2Fuploads%2F1RrQ1AAPBgWhp8Lx2DvE%2Fimage.png?alt=media&#x26;token=78774c99-509d-400e-9d88-27314c8f9957" 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="https://1851866520-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWx9bMxy88NRLPUcOemU%2Fuploads%2F9rmtqzjUsI0koRwH2zWQ%2Fimage.png?alt=media&#x26;token=b417ca1e-1cd2-4738-86b9-1979981cb3bf" 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="https://1851866520-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWx9bMxy88NRLPUcOemU%2Fuploads%2Frsk7PiOIeDkvXYYG8Ntm%2Fimage.png?alt=media&#x26;token=f4207a04-9738-47d8-a1fa-ec9fcfa1190c" alt=""><figcaption></figcaption></figure>