Product | Communication | Bluetooth | Serial Port Bluetooth Module -BC4
Serial Port Bluetooth Module -BC4
Serial Port Bluetooth Module -BC4
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Serial Port Bluetooth Module -BC4

Please choose the mode you want to order : Master or Slave

Industrial serial port bluetooth, Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port replacement to establish connection between MCU and GPS, PC to your embedded project and etc.

Default serail port setting :  115200(optional 4800,9600,19200), N, 8, 1
Pairing code : 1234

Running in slave role: Pair with BT dongle and master module.

Specification :
Bluetooth protocal :  Bluetooth Specification v2.0+EDR

Frequency :  2.4GHz ISM band

Modulation :  GFSK(Gaussian Frequency Shift Keying)

Emission power :  ≤4dBm, Class 2

Sensitivity :  ≤-84dBm at 0.1% BER

Speed : Asynchronous:  2.1Mbps(Max) / 160 kbps ; Synchronous: 1Mbps/1Mbps

Security :  Authentication and encryption

Profiles :  Bluetooth serial port(master & slave)

CSR chip : Bluetooth v2.0

Wave band : 2.4GHz—2.8GHz, ISM Band

Protocol : Bluetooth V2.0

Power Class : (+6dbm)

Reception sensitivity: -85dBm

Voltage : +3.3V
50mA (2.7V—4.2V)

Current : Paring - 35mA, Connected - 8mA

Temperature : -20℃~ +55℃

User defined Baud rate : 

200, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 1382400

Dimension : 26.9mm*13mm*2.2mm

Coupled Mode: Two modules will establish communication automatically when powered.

PC hosted mode: Pair the module with bluetooth dongle directly as virtual serial.

Pin Definition :


Common Pin Explanation :

1、PIO8 connects with LED cathodea with 470ohm series resistor in between. LED NEGATIVE connects to ground. It is used to indicate the module state. After powered on, flashing intervals differ in different states.

2、PIO9 is used to control LED indicating paring. It will be steady on when paring is successful.

3、PIO11, module state switching pin. HIGH -> response to AT command; LOW or floating -> regular work status.

4、With build-in reset circuit, reset is completed automatically after powered on.

Steps to set as master mode :

1、Set PIO11 HIGH with a 10K resistor in between.

2、Power on, module comes into AT Command Response Status

3、Open HyperTerminal or other serial tool, set the baud rate 38400, 8 data bits, 1 stop bit, no parity bit, no Flow Control

4、Via serial port, send characters "AT + ROLE = 1 r n",if successful, return "OK r n", where r n is carriage return.

10、Set PIO11 LOW, re-power, then in Master state, automatically search for slave module and connect.

Application :

Computer and peripheral devices

GPS receiver

Industrial control

MCU projects

Document Download Area :

Click to Download the datasheet

Click to Download the manual

Click to Download the AT Command


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