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October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 16

2.1.2.9. CHANGEPPORT message

This is the message that any of the systems of the family E400 sends when detecting a change in any of

their inputs. This message contains the information related to the inputs status change and

furthermore it informs about the outputs status.

The possibility of using or not this message is enabled by configuring the web server. It will be

automatically sent to the controller every time there is a change in any of the inputs.

In the following example with E401, out of the 18 available inputs/outputs 2 of them are configured as

inputs and the last one as output. The status at the moment of sending the message is shown in the

first parameter; Inputs: the first one at high level and the second one at low level; Output: at low level.

The second parameter of the message indicates in which input there has been a status change. In the

example, the delivery of the message has been originated by the first one of the two inputs.

Address: E400  CC

Syntax: Command

CHANGEPPORT

Parameters:

List of the current inputs/outputs status (1,0, X: not used)

List indicating which inputs have changed. All the bits will

be 0 but the ones corresponding to the inputs causing the

delivery of the message.

Example: [E401]: CHANGEPPORT X10XXXXXXXXXXXXXX0/010000000000000000&

[E451]: CHANGEPPORT 10/10&

In the case of E451, since the input is fixed, whenever there is a change the second parameter will

indicate “10”.

After sending this message, E400 waits for the corresponding ACK_CHANGEPPORT.

2.1.2.10. ACK_ CHANGEPPORT message

This is the message that the controller has to send back to E400 as the answer to a CHANGEPPORT.

Address: CC  E400

Syntax: Command

ACK_CHANGEPPORT

Parameters: None

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