Data Sheet

Mode switching

The switching between AT-CMD and Transparent mode is automatically. When

PRBMD02 is NOT connected with smartphone, tablet…, PRBMD02 will enter AT-CMD

mode and AT-command will be accepted from UART port; and once PRBMD02 is

connected to with smartphone or any other BT device, PRBMD02 will automatically go

into Transparent mode, and all data from UART, even AT-CMD, will be treated as data

and send out to BT side. The operation is illustrated as following:

Pin deﬁnition

The PRBMD02 default ﬁrmware mainly deﬁned some pins of PRBMD02 as following:

P34: BT_Connect, it is used to connect with LED to indicate the BT connection status.

Before connection, this pin will toggle at about 2Hz frequency, and after a connection is

established, this pin will turn to LOW status

P09: UART_Tx, Firmware deﬁne it as Tx pin of UART, which is supposed to be connect

to UART Rx pin of MCU or other device.

P10: UART_Rx, Firmware deﬁne it as Rx pin of UART, which is supposed to be connect

to UART Tx pin of MCU or other device.

PRBMD02 DATASHEET 1.10

K-SOLUTION

Pin assignment in PRBMD02

AT-CMD

Transparent

AT-CMD

Transparent

AT-CMD

Transparent

AT-CMD

Connected

Disconnected