user15235: I have servo (TowerPro sg90) connected to 32 servo controller (this one) through UART interface (RX-TX, GND-GND). 
Seller provide documentation how to connect and control my servos, but it isn't work. 
Servo work if I connect it indirectly to Arduino. Controller indicate that it is working too (photo below - red led).
I already try different servos. Also try use provided software to control servos from pc through Mac/PC. But it's interface is unreadable for me. I tried different options but servos not responding. 
Sketch code below (from sellers examples):
void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print("#3P500T2000\r\n");
  delay(2000);
  Serial.print("#3P1500T2000\r\n");
  delay(3000);
  Serial.print("#3P2500T2000\r\n"); 
  delay(2000);
  Serial.print("#3P1500T2000\r\n");
  delay(2000);
}

Photo of my connections: 

Sorry if it post duplicate some, but I cannot google this problem.

user4143: There is one connection missing - the one that powers the servo and board.
At the moment your servo board is getting a small amount of power through the RX pin - disconnect it immediately, you are damaging it.
You need to provide +5V to the +5V terminal block, and also a suitable voltage (+5V should do) to the VCC on the terminal block.

15235: <p>I have servo (TowerPro sg90) connected to 32 servo controller (<a href="http://www.aliexpress.com/item/New-Version-32-Channel-Robot-Servo-Control-Board-Servo-Motor-Controller-PS2-Wireless-Control-USB-UART/32272674301.html" rel="nofollow noreferrer">this one</a>) through UART interface (RX-TX, GND-GND). 
Seller provide documentation how to connect and control my servos, but it isn't work. </p>

<p>Servo work if I connect it indirectly to Arduino. Controller indicate that it is working too (photo below - red led).</p>

<p>I already try different servos. Also try use provided software to control servos from pc through Mac/PC. But it's interface is unreadable for me. I tried different options but servos not responding. </p>

<p>Sketch code below (from sellers examples):</p>

<pre><code>void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print("#3P500T2000\r\n");
  delay(2000);
  Serial.print("#3P1500T2000\r\n");
  delay(3000);
  Serial.print("#3P2500T2000\r\n"); 
  delay(2000);
  Serial.print("#3P1500T2000\r\n");
  delay(2000);
}
</code></pre>

<p>Photo of my connections: </p>

<p><a href="https://i.stack.imgur.com/Verqy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Verqy.jpg" alt="arduino-duamilanovo+32-servo-controller+servo"></a></p>

<p>Sorry if it post duplicate some, but I cannot google this problem.</p>
 4143: <p>There is one connection missing - the one that powers the servo and board.</p>

<p>At the moment your servo board is getting a small amount of power through the RX pin - <strong>disconnect it immediately, you are damaging it</strong>.</p>

<p>You need to provide +5V to the +5V terminal block, and also a suitable voltage (+5V should do) to the VCC on the terminal block.</p>
