CA750 Cisco: Flashing Lights on Button Console


A break in communication between the controller in the console and the SX20
codec causes a known issue where the cart buttons become unusable.

This is often due to a Cisco Unified Communications Manager (CUCM), if present, pushing configuration changes to the system when it connects to the network. One of these changes is to turn the Serial Port Login Required setting on the codec to “On” (this is the default serial port setting for devices in CUCM). The serial port login requirement must be “Off” on the SX20 in order for the console to communicate with the codec.


  • Avizia screen hangs for an excessive amount of time. 
  • Blue Serial Port Login error on screen.
  • Amber lights blinking on the button console. 

 Parts List

  • Computer on the same network as the cart. 
  • Web Browser
  • Remote Control (If cart is not online or cannot be plugged into the network) 

Step By Step Directions

The most common cause of this issue is simply that the cart has gotten into an odd state and needs to be reset.

Before following any other steps, please perform a Quick Reset on the cart. 


  1. Physically accessing the Codec 
      1. Look underneath the work surface (counter top) of the cart. 
      2. Locate the white light near the front right corner. 
  2. CA750_Codec_Light.jpg

        • NOTE: If there is no white light, it is possible the codec has not powered on. Use a paperclip or similar to press the On button of the codec. 
      1. Point the remote at the light to navigate the menu.
        1. Press the check mark to bring up the codec menu. 
        2. Use the directional pad and check mark to select Settings -> Administrator Settings -> Advanced Configuration.
        3. Scroll down to SerialPort.
        4. Expand the menu and verify the following settings are correct: 
          • BaudRate: 38400
          • LoginRequired: Off
          • Mode: On
        5. If any of these settings are different than above, the cart will not communicate properly with the codec. 
    1. Wait a few moments for the cart to recognize the changes made. 
      • The amber lights should stop blinking and turn solid for a moment before going out entirely. 

2. Using the Codec Web Interface

    1. Wait 2-3 minutes for the cart to boot fully past the Avizia Screen.
    2. Identify the IP address of the cart
      • If the cart has previously been registered with TMS or CUCM, it should still appear in the system
      • If the cart has not yet registered the IP address should appear on the screen in the top left corner
    1. Open a web browser on a computer connected to the same network as the cart
    2. Enter the IP address of the Cart and press enter.
    3. Login with Username: admin / Password: blank
    4. In the top menu bar, click on Configuration -> System Configuration
    5. On the sidebar on the left, click on Serial Port.
    6. Verify the following settings
      1. BaudRate: 38400
      2. LoginRequired: Off
      3. Mode: On
    7. If any of these settings are different than above, the cart will not communicate properly with the codec. 
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