USER MANUAL
Page 6/ 16
页
HLK-B10
4. Basic Functional Description
4.1. Two working states of the module
HLK-B10 module has two working states: transmission mode and AT command mode.
In AT command mode, the command can be sent to the module through serial port to
configure the parameters of the module and query the information of the module.
In transmission mode, the module will transmit the serial port data and Bluetooth
connection data in two-way.
Starting module, the default is the transmission mode; there is no affect to the Bluetooth
connection state when exit transmission mode into AT mode. The serial port-Bluetooth data
transmission is paused, and the data received by the serial port is processed by the current
AT instruction. After the transmission is restored, the data transmission will continue.
4.2. Function Keys and Status Indicators
4.2.1. State output pin
The 16th foot of the module P02 is output pin for state LED
，
When this pin is connected to
the LED cathode, the current working status of the module can be displayed through the
light and off status of the LED. The LED display status is defined as follows
：
AT command
mode
Intermittent flash
（
every 2 fast flash
）
Transmission
mode
No connect Bluetooth
，
slow flash
（
bright 1s turn off 1s
）
Connect Bluetooth
，
Long bright and short off
（
bright 5s turn off 100ms
）
Restore default settings
，
Continuous flash
4.2.2. Function key input pin
Module 5 pin P 11 for function key input pin. that is ES/Del pin, a key can be connected
between this pin and GND,The functions corresponding to different operation of the key are
as follows
：
Short press
（
50ms
～
1s
）
the module will exit transmission mode.
，
switch to AT command
