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October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 7

2.1 Calls establishment and control: EQUITEL proprietary protocol

According to EQUITEL proprietary protocol, the communications between the control center and the E400

modules are based on a “delivery-answer” scheme. That is, any of the links willing to communicate with the

other one will send a message, and it is compulsory to receive an answer from the callee.

Should the answer not be received within a previously fixed time (3 seconds by default), the unit shall make a

preconfigured number of retries (3 by default), as explained in Figure 9.

The messages transmitted are commands in ASCII characters or “plain text”.

These messages have a very simple structure:

COMMAND PARAM_1/PARAM_2/PARAM_N&

• COMMAND (COMMAND): Delivery or answer order, depending on the type of the message.

• PARAM_X: Each one of the parameters that a command requires. They are separated by the symbol

“/”. It is not compulsory a command to require any parameters.

• &: Symbol indicating the end of a delivery or answer message.

Those messages are encapsulated in a TCP packet and they are sent through the IP network.

There must be a computer within the network, and we shall give it the name of “controller”. It will run the

software to control the IP intercom network (see Figure 1). You can use the demo application supplied by

EQUITEL)

Figure 9. “Delivery-answer” process in EQUITEL proprietary protocol

The following tables summarize the possible actions generated or allowed by the equipments of the family

E400, as well as the related answers:

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 31 32

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Equitel E451 Manual de usuario Pagina 10