Ezurio BISM2 Guide de l'utilisateur télécharger pdf (Page 26)

3. Unsolicited Responses

The ‘AT’ Protocol is a command/response type of protocol. This means that the EZURiO device will

normally only respond to AT commands.

Under special circumstances, unsolicited responses will be sent to the host. They are described in

the following subsections.

3.1 RING

This string is sent to the host when a remote device is initiating a serial port connection.

The fully qualified string is in the form RING 012345678901 where 012345678901 is a 12

digit hexadecimal number which corresponds to the remote device’s Bluetooth address.

This response is sent to the host every 2 seconds until the host either accepts the

connection using the ATA command or rejects it using the ATH command.

3.2 PIN?

This response is sent to the host during a pairing negotiation.

The fully qualified string is PIN? 012345678901 where 012345678901 is the Bluetooth

address of the peer device. In response, the host must supply a pin code which is entered

using the AT+BTK command.

If the peer address does not supply the address in the message exchange, then the

address is specified as 000000000000 – and the paring will proceed as normal.

3.3 AUDIO ON

This response is sent to the host when a SCO channel has been established.

3.4 AUDIO OFF

This response is sent to the host when an existing SCO channel has been closed.

3.5 AUDIO FAIL

This response is sent to the host when a SCO channel setup fails.

3.6 ERROR 27

This response is sent to the host on power up if the firmware is unlicensed.

3.7 PAIR n <bd_addr>

This response is sent to the host on termination of a pairing process. If pairing was

successful then ‘n’ = 0, if a timeout occurred then ‘n’=1 and for all other unsuccessful

outcomes the value will be 2.

The parameter <bd_addr> is the address of the peer device if available.

3.8 PAIR 0 <bd_addr> MM

This response is sent to the host on termination of a successful pairing process. The

optional MM is sent only if S Register 538 is set to 1 to automatically save the link key. The

value MM indicates the result of the save operation and a value of 00 implies success,

otherwise the value corresponds to an error code.

3.9 RX<string>

This response is sent to the host when the unit is in online-command mode and S Register

531 is set to 3 and data arrives from a peer.

If the data from the string contains non-visual characters (for example ASCII 0 to 31 and

ASCII 128 to 255), then those characters are translated into a 3 character escape

sequence starting with ‘\’. For example the embedded <cr><lf> sequence would be sent

as the 6 character string \0D\0A.

If the data contains the character ‘"’ then it is sent as \22.

If the data contains the character ‘\’ then it is sent as \5C

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Ezurio BISM2 Guide de l'utilisateur Page 26

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