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Shenzhen Hi-Link Electronic Co., Ltd.
Manual
HLK-B20
>Tes
RESET
<Trst
t
AT Command
Figure 6. RST Exit transparent mode
Notes: Tes=100ms, Trst=6s
6. Led light indication meaning
The status of the led connection module's P02 pin, corresponding to the sta led on the test board:
* Double flash: Bluetooth is not connected, and is in transparent mode
* Triple flash: AT command mode
* Long extinction or fast flash: Bluetooth is connected, it will flash quickly when there is transparent
data transmission
7. Parameter configuration method
The module configuration is mainly configured through the serial port AT command.To configure
parameters through the serial AT command, you need to let the module enter the AT command mode
first.The serial port configuration tool HLK-B20_CONFIG, that configures the module through the AT
command mode, through the parameters of each configuration combinations, provides a simple and
convenient configuration process.
8. Serial port AT command configuration
8.1. AT instruction format
In AT mode, system parameters can be configured through the AT command of
the serial port. The format of the instruction is as follows: at+[command]=[value]\r
Different return values of the module will be returned depending on the different
command.
Example: "at+ble_name=blename\r" sets the module broadcast address to blename.
Example: "at+ver=?\r" queries the module program version number.
