User's Manual

User Manual of HC-42 Bluetooth Serial Port Communication Module G
athering information and Carrying Dreams
Website：
http://www.hc01.com
Guangzhou HC Information Technology Co., Ltd
Address: Room 608, No.19, Jiangong Road, Tianhe Science Park, Tianhe District, Guangzhou City, Guangdong Province
Technical customer service QQ: 445253184 Sales hot line: 020-8408-3341
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Or in other words: Only when AT+SLEEP and LPIN are both set to low power consumption, the
module can be in low power consumption.
Reminder: The interval between entering and exiting from low power consumption is recommended
to be greater than 100ms.
5.3.9 Module shutdown command
command Response Explanation Details
AT+PD OK+PD
Module entering
shutdown state
At this time, the operating current of the module
is about 0.3µA
In this state, the module can only be awakened
by pulling down LPIN or RESET, and the module
is automatically reset in the wake-up process.
Suggestion: If the module is used under certain power-saving situations, it is suggested that the module can be
shut down by AT+PD command without controlling the working power supply of the module, so as to avoid the
slow response caused by voltage residue in the mode of cutting off the power supply.
5.3.10 Bluetooth indicating LED operating mode
command Response Explanation Details
AT+LEDnM OK+LEDnM=2
Inquire operating
mode of LEDn
LEDn can be LED1 (external indicator LED) and LED2
(onboard indicator LED)
AT+LEDnM=x OK+LEDnM=x
Set operating
mode of LEDn
Parameter n represents the mode and supports the
following modes:
1: OFF
2:Following low power consumption (turn off automatically
at low power consumption, and turn on at other times)
3: ON
Examples:
Send: AT+LED1M Return: OK+LED1M=2 (the operating mode of LED1 is mode 2)
Send: AT+LED2M=1 Return: OK+LED2M=1 (set the operating mode of LED2 is mode1)
5.3.11 Module parameter restore defaults command
command Response Explanation Details
AT+DEFAULT OK+DEFAULT
Module parameter
recovers default
value
Default value of module parameters:
Bluetooth name: HC-42
Serial baud rate: 9600bps
Broadcast interval: 200mS
Power c
onsumption mode: 0 (power-on, full
speed operation)
Onboard LED 2:1
External indicator led1: 2