Specifications

HM-BT4502 V1.0
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data throughput capabilities according to different serial baud rates, BLE
connection interval and different sending packages interval. The default serial
port baud rate is 115200 bps. In the level enable mode, the following is a
detailed description of the pass-through protocol for this configuration. The
module can send up to 240bytes of packages at one time from the serial port.
The module will subcontract or send the complete data package according to
Bluetooth protocol. The data packets sent by mobile devices to modules must
be sent according to protocols. After the module receives these packages, it
will forward them to the host serial port instantly.
1. Serial port hardware protocol parameter: 115 200 bps, 8 is No Check Bit, 1
is Stop Bit.
2. When the PDN is in high level then the Bluetooth module is in full sleep
state. When the PDN is set from high to low (edge trigger), the module will
start advertisement with 200ms intervals until the successful connection
with the mobile phone. When the PDN jumps from the low level to the high
level, the module will go to the sleep immediately regardless of the module
status.
3. When the module has a request for data upload to MCU, it will set the INT
low and start sending the data after 1ms at the earliest until the data has
been sent. This delay can be configured by the AT instruction, see the
chapter of
Serial AT Instructions . After sending the data, the module will