AT command

GS-BT2416C2.AT1

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Moreover it is possible to store a startup commands sequence directly into flash memory.

The sequence can be long up to 512bytes. If a macro sequence is present, in startup phase,

some OK events are generated, one for every command of the sequence, before the

+READY event.

This behavior can be avoided setting a AT+ECHO=OFF command starting the macro

(avoiding the +READY too). The sequence execution is stoppable changing the state of

GPIO3 in startup phase.

A.3

Interfaces

The module must be controlled by an external MCU using the UART and 2 GPIOs.

●

UART: used to control the module with AT commands (COMMAND MODE), or

send/receive serial data to be transmitted over the SPP Bluetooth link (DATA MODE).

The first time that the module is powered up, the default UART settings are as following

(saved in flash memory):

Baud rate: (bps) 9600

Data bits: 8

Parity: None

Stop bits: 1

Flow control: None

When these settings are changed by the AT+UARTSETUP command, they are stored in the

flash memory to be reloaded when the module is powered up the next time.

●

GPIO1: configured as output. GPIO1 is high when an SPP Bluetooth link to a remote

device is present. GPIO1 is low when no Bluetooth link is present.

●

GPIO3: configured as input. If GPIO3 is set to high the module switches its mode of

operation to DATA MODE.

If GPIO3 is set to low, the module switches its mode of operation to COMMAND MODE.