User Manual
HLK-B40
You can choose to turn on the pairing and binding function of the Bluetooth connection. After it is turned on, the
security can be increased, but the operation steps are increased accordingly. It is valid in slave or master mode. The
pairing method is PASSKEY ENTRY, 6-digit PingCode. After the binding function is turned on, Bluetooth data
can be sent and received only after pairing and binding. Unpaired devices cannot transparently transmit data
through Bluetooth and the module.
In the master mode, you need to set the MAC address of the target slave to be connected. After the module
starts, it will automatically scan and connect to the target slave device and will automatically reconnect and
reconnect if the slave is not found or the connection is disconnected. The interval time can be set by the
AT+RECONNI command, the default is 5s, that is, when it is not connected, it will try to reconnect every 5
seconds until it is connected.
5. A quick start guide
5.1. Test the debug base plate
In order to enable users to quickly verify and debug the module, our company has developed a dedicated B40
test board. It is recommended that you choose to use this test board when you use this module for the first time.
The test board is directly powered by USB and comes with a USB-to-serial function. After connecting to the
computer through the USB cable, you can connect to the module's serial port through the USB-to-serial port. No
additional serial cable is required, which is easy to use.
Figure 7 The module tests the appearance and functional schematic of the base plate
