Bluetooth master/slave module has 4 pins:
Pin 1: *5 V power supply
Pin 2: Data sending Pin (which can be connected with the RXD serial terminal of other other chips)
Pin 3: Data receiving Pin (which can be connected with the TXD serial terminal of other other chips)
Pin 4: GND Ground
Here are some usage examples:
Example 1: PC serial port + RS***-TTL conversion circuit + Bluetooth master module + Bluetooth slave module
Note: In the example above, master and slave bluetooths can exchange their places, which will not affect data communications. However, on occasions that confidential communications is required, slave bluetooth is connected with PC and master bluetooth is connected equipment terminal, because mobile phones and computers with bluetooth or other Bluetooth devices can not search the master module, but the slave module)
Example 2: USB-TTL conversion module + master Bluetooth module + slave Bluetooth module
Note: In the example above, master and slave bluetooths can exchange their places.
Example 3: PC Bluetooth adapter + master Bluetooth module + slave Bluetooth module
Note: In example 3 PC Bluetooth adapter has to work with slave Bluetooth module because it can not pair with master Bluetooth module. Please install IVT Corporation BlueSoleil before using PC Bluetooth adapter. Bluetooth mobile phones and Bluetooth devices can also pair with slave Bluetooth module. Data communication can happen between each other. But Bluetooth management software is needed on Bluetooth mobile phone.
Example 4: Equipments with serial port + master Bluetooth module+ slave Bluetooth module
Note: In example 4, the two equipments can send or receive data wirelessly. They were connected with master Bluetooth module and slave Bluetooth module. When Bluetooth modules are powered on, they will pair with each other automatically, without manually entering the password.
Usage:
1. If you use master Bluetooth mudule and slave Bluetooth mudule to communicate, the two modules will pair with each other automatically.
2. If you use Bluetooth adapter and slave Bluetooth mudule, please install BlueSoleil. Search for devices using BlueSoleil, and the slave Bluetooth mudule will be found. Then select "match" option, enter the password ***4, then OK. Then you can use the serial service.
Baud rate: ***0, ***0, ***0, ***0, ****0, ****0, ****0, *****0, *****0, *****0, *****0, ******0. Users are free to change or set it. The default baud rate is ***0.
Frequency: 2.4GHz*2.*8GHz. ISM Band
Bluetooth protocol: BlueTooth V2.0 standard
Receiving sensitivity: **5dBm
Operating Voltage: 5V
Operating temperature: **0 centigrade to ***5 centigrade
Power rating: Class2 (*6 dBm)
Reference Power consumption: *5mA(searching), 8mA(paired)
How to change the setting? (we do not recommend to modify the default settings which can satisfy most needs)
Step 1: Modify the COM settings:
COM: (according to the PC)
Baud rate: ***0
Test bits: N
Data bits: 8
Stop bit: 1
Step 2: Before the module is paired(when LED lights is flashing), sends the following commands to modify Bluetooth parameters:
1. Modify the baud rate
Send: AT + BAUD1 ("1" is a serial number, please refer to the following to find the baud rate you want)
Return: OK***0
Baud rate of the serial number as follows:
* 1 ********- ***0
* 2 ********- ***0
* 3 ********- ***0
* 4 ********- ***0
* 5 ********- ****0
* 6 ********- ****0
* 7 ********- ****0
* 8 ********- *****0
* 9 ********- *****0
* A ********- *****0
* B ********- *****0
* C ********- ******0