Master/slave mode setting and other configuration:
1. master/slave mode setting
BLK-MD-BC04-B bluetooth module supports setting the master/slave mode by soft or hardware. The method is as follows:
PIO(4)——soft/hardware setting: Low level(or impending) for hardware setting master-slave mode; High level（3.3V）for soft setting master-slave mode.
PIO(5)——master-slave mode setting interface by hardware. 3.3V high level for master mode, GND(or impending) for slave mode.
If you select soft setting the master-slave mode, use the AT commands, see “BLK-MD-BC04-B bluetooth module AT commands instruction”.
2. state instructions LED: PIO(1)
Show the state of the bluetooth module, the LED’s flashing way and the state of bluetooth module see below:
3. Host interrupts instruction LED: PIO(2)
Used to indicate if the host interrupt or not, if connection it is high level, other state is low level.
4. Memory clear or restore default button: PIO(3)
This button is a multifunction button, with the functions of memory clear (short press) and restore default values (long press for 3s). Memory clear is to clear last bluetooth address in the memory. Restoring the default value is to restore module initial default values.
The product specification:
Ø Bluetooth protocol: Bluetooth Specification v2.1+EDR
Ø USB protocol: USB v1.1/2.0
Ø Frequency: 2.4GHz ISM band
Ø Modulation: GFSK(Gaussian Frequency Shift keying)
Ø Transmission power: ≤4dBm, Class 2
Ø Sensitivity: ≤-84dBm at 0.1% BER
Ø Rate: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
Ø Security features: Authentication and encryption
Ø Support profiles: SPP(master & slave)
Ø Power supply: +3.3VDC 50mA
Ø Working temperature: –20 ~ +55 Centigrade
Ø Size: 26.7mm x 13mm x 2.2 mm
The firmware has upgraded to the latest version now:
² Serial baud rate default for: 9600dps
² The matchmaking password: 1234
² The default name: BOLUTEK
Document material: “BLK-MD-BC04-B bluetooth module’s specification instruction manual” and “AT instruction manual”.