Equitel E451 Manual de usuario descargar pdf (Pagina 13)

October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 10

2.1.1. Call, answer and audio control

The modules E400 accept a button dedicated to user calls. The call generation process using EQUITEL

proprietary protocol is shown in Figure 10.

Figure 10. Call establishment process

When the call button is activated, E400 sends a DEMCALL message to the controller. Should it receive the

corresponding ACK, it begins to play the prerecorded message “calling tone”, and waits for the controller

to activate audio. If there is no answer, the “offline tone” begins to play (twice).

If there is an answer from the controller but after some configurable time (1 minute by default) the audio

is not activated, the module plays the “offline tone” message (twice) and it will pass to stand-by mode.

Once the audio is activated, it will remain in this status till the controller sends the deactivation order or

the module E400 does not receive the refresh order within a maximum of 2 minutes.

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Equitel E451 Manual de usuario Pagina 13