# 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%2F7QMNneVUC17WO5udXKTK%2Fimage.png?alt=media&#x26;token=6007fb0a-7be1-4ed1-9c05-bf27f5bc1552" 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%2FOq8nrDAOw8O1li7B0gxB%2Fimage.png?alt=media&#x26;token=5fc6f893-060b-435c-ae37-45c8508b5b66" 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>