Consuming Electronics Control (Cec) Interface; Audio Interface; Audio Input Modes; Audio Output Modes - Lightware MMX4x2-HDMI User Manual

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4. Device Concept
4.3. Consuming Electronics Control (CEC) Interface
Consumer Electronics Control (CEC) is a bi-directional communication, defined in the HDMI standard. This
feature is for remote control of the source and sink devices in the A/V system.
MMX4x2 model is able to send and receive CEC commands, from the input ports towards the source, and
from outputs port towards the sink. For more information about sending CEC messages, see
Sending section.
CEC has a dedicated pin in the HDMI connector. DVI connector does not contain this pin, so the CEC
transmission brakes when HDMI-DVI connector or adapter is in the signal route.
CEC Application Example
When active signal is detected on HDMI in, the switcher sends a CEC message automatically to the HDTV to
wake up.
Create an event in the event manager:
▪ Set as a condition, that the signal is present on the output (O1),
▪ Set as an action then send a CEC command 'Image view on' O1 output port.
See the details about the Event Manager settings in the
4.4. Audio Interface
4.4.1. Audio Input Modes
The device can receive embedded audio signal on the HDMI inputs and analog audio signal over the analog
audio input port.
In case of MMX4x2-HT200 model embedded audio signal can be received on the TPS input port as well.
Audio Embedding
The matrix has a built-in audio embedder function what means the audio signal which is received on the
analog audio input port is able to be embedded to the HDMI outputs.
4.4.2. Audio Output Modes
The MMX4x2 series matrix can transmit two types of audio:
▪ Embedded (HDMI) and
▪ Analog balanced stereo audio.
CEC Command
Event Manage section
Applied firmware package: v1.5.0b8 | LDC software: v2.3.0b1
MMX4x2 series – User's Manual
Audio De-embedding
The matrix has a built-in audio de-embedder which means the device is able to de-embed audio from its
HDMI outputs to its analog audio output port.

ATTENTION! De-embedding function supports 2 channel PCM audio signals only. Other audio formats
are not supported and de-embedding will not be successful.
4.4.3. Audio Options - Example
The Concept
Three sources are connected to the matrix: the Laptop on HDMI input 1, the PC on HDMI input 2, and a Media
player on the analog audio input. On the output side three sink devices wait for the audio signals: an HDTV
on HDMI output 1, a Monitor with speakers on HDMI output 2, and an Audio Amplifier on the analog audio
output line. The video line of the Laptop is switched to HDTV and the PC is switched to the Monitor with
speakers. The embedding and de-embedding functions of the matrix allow the infinite variations to transmit
the analog and digital audio signals.
The following ways are available for the audio devices:
▪ When the sink device is the HDTV, the audio source can be the Laptop, the PC, and the Media Player.
When the sink device is the Monitor with speakers, the audio source can be the Laptop, the PC, and the
▪
Media player.
▪ When the sink device is the Audio amplifier, the audio source can be the Laptop, the PC and the Media
player.
INFO:
All related settings are available in the LDC software, see the details in the
25
Crosspoint Menu section.