What is CEC? Use, Settings, Commands, and other details

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What is CEC
CEC (Consumer Electronics Control) diagram

What is CEC (Consumer Electronics Control)?

CEC is a built-in feature of the HDMI interface and is designed to allow the user to control multiple devices (up to 10) with just one remote control (such as a TV). CEC also allows some devices to configure each other without user interaction. HDMI-CEC is a single-wire, bi-directional serial bus that functions as a remote control.

Example

You connect a game console to the TV and adjust its settings using the TV remote control. The benefit of such a technical solution is undeniable. You do not need to constantly change the remotes. Everything can be configured with the help of a single one.

Technically, this is implemented through the 13th pin in the interface. In any bundle, the monitor or TV is considered the main device, and all the rest are adjusted to it.

Technology names for different brands

Different manufacturers of household appliances and electronics have developed their own technologies based on the CEC protocol. Here are the most famous names:

BrandTechnology names
SamsungAnynet +
LGSimplink
HitachiHDMI-CEC
SonyBRAVIA Sync
ToshibaRegza Link
PioneerKuro Link
PanasonicVIERA Link EZ-Sync
SharpAquos Link
MitsubishiNetCommand for HDMI
PhillipsEasy Link
OnkyoRIHD

How to enable HDMI CEC on popular TV Brands

Technical implementation of the interface

CEC is implemented as a trunk wire in the HDMI connector. This allows devices that support this interface to interact with each other. The main idea of ​​the “product” is to control one remote control – several devices.

To perform specific actions, operations can be exchanged between linked devices (for example, recording to STB/DVR) or receiving general information. For example information about pressing a specific key on the remote control.

In any installation with HDMI – the display is considered the default device and receives two dedicated labels, a physical address (0.0.0.0) and a logical address (0). At any point in a given system, all CEC devices have both physical and logical addresses. At the same time, devices that do not support CEC have only physical addresses. Physical addresses are processed based on location to the default device. For example:

  1. If the output of the A / V – the receiver is connected to the HDMI1 connector of the TV. It receives the physical address 1.1.0.0;
  2. When connected to the second port, you get 2.0.0.

Logical addresses are assigned to devices based on their functionality (as provided in the CEC specification document). When the menu of an HDMI device is displayed on the display. (On the Sony KDL46EX720, this is achieved by pressing the Sync button). The display sends a signal over the CEC wire to all connected devices.

After that, responses are collected and the user is provided with a list of CEC-compatible devices. Selecting one of these will ensure that future remote keystrokes on the remote control are immediately transmitted to the TV.

How to setup HDMI CEC?

In the vast majority of cases, you do not need to configure anything additionally: after pairing the two devices, they recognize each other. With the help of the TV remote control, you can now control, for example, the receiver.

However, the standard TV remote may not have some necessary commands. In this case, it is rational to use the so-called multi-controller – a universal gadget with a bunch of buttons.

How to disable this protocol?

Through the menu of the device that is paired with the TV or monitor. If the technology is supported, there will definitely be an option in the menu to deactivate it.

Supported commands

Using CEC, you can issue the following commands to paired devices:

CommandResult
PlaybackThe device becomes a signal source – video and audio streams.
Standby modeThe entire system goes into standby mode.
TranslationTuner settings are exported to another device.
One-touch recordingThe recording starts immediately.
Timer settingsOne device controls the other’s timer.
InformationChecks all system parameters.
Management packageControls playback
TunerControls the tuner of another device.
OSD menuTV is used to display text
RoutingSwitching between signal sources
Name transferTransmits the device name to the connected TV

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