■Product functions and features
The main function of this product is to replace the traditional RS232 serial communication cable and transform the wired serial connection into a wireless Bluetooth serial connection, thereby realizing wireless serial communication. This product can be connected to any device with a standard RS232 serial port through the DB9 interface, and can be used for wireless serial communication with USB Bluetooth adapters, laptops, tablets, mobile phones, PDAs and other devices that support Bluetooth SPP communication.
● This product is embedded with Bluetooth communication protocol software and supports Bluetooth SPP (Serial Port Profile). There is no need to install a driver that supports its work on the attached device. It can be used on various devices with standard RS232 serial ports.
● The user does not need to know the professional knowledge of Bluetooth communication technology. For the user, it is still ordinary serial communication, which is no different from the traditional serial cable connection. The serial communication software or serial communication code used on the wired serial connection can still be used. continue to use.
● This product is an upgraded version of BT5701. One device has multiple functions, which can be connected to both male and female devices; it can be used as a Bluetooth slave or a Bluetooth master.
● Built-in lithium battery and charging circuit, can be used in occasions without external power supply. There are two styles, Class1 and Class2, and the open space communication distance is 100 meters and 10 meters respectively.
● Provide a wealth of AT commands, users can set the adapter''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s baud rate, stop bit, and verification mode according to their own application requirements, modify the adapter''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s Bluetooth name, master-slave role, and pairing password, and can also use AT commands Query the current working status of the adapter.
● Provide male and female switch. If it is connected to a male device, switch to F; if it is connected to a female device, switch to M.
■Market and application
The purpose of using BT578 is to replace the original serial cable, but how to replace it, users should have a clear plan before purchasing the product. The following are several typical applications of BT578.
● The BT578 slave is connected to the serial device through the DB9 serial port, and is paired with Bluetooth master devices such as Bluetooth laptops, USB Bluetooth adapters, Bluetooth tablets or mobile phones. This is the most common way to use BT578. The BT578 slave device can only wait for the Bluetooth master device to find it. When the master device finds the slave device, it sends a pairing request from the master device and enters the correct pairing password of the slave device on the master device for verification.(BT578 factory default pairing password is 0000), After the pairing is completed, the Bluetooth master device will assign a Bluetooth virtual serial port number to BT578. The serial communication application running on the master device only needs to set the virtual serial port number to communicate with BT578 and then communicate with BT578. The connected serial device performs serial communication.
● BT578 slave and BT578 master are used in pairs. First set a BT578 as the master through the AT command, and then connect the master and slave to the two serial ports connected by the original serial cable. After the master is powered on, it will automatically search for the slave and complete the pairing with the slave. connect. After the connection is successful, the blue indicator light on the host and slave changes from fast flashing to double flashing, and the green light is on.
● The BT578 host is connected to the Bluetooth slave device for use. After the host is powered on, it will continuously search for surrounding Bluetooth devices and try to pair with them. If the surrounding Bluetooth devices respond to the pairing request of BT578 and use the same pairing password, the pairing can be successful.
■Main specifications
● Executive standard: Bluetooth SIG v2.0,
● Bluetooth protocol: Bluetooth serial port profile (SPP)
● Communication rate: 4800, 9600, 19200, 38400, 57600, 115200bps
● Modulation mode: 2.4G direct sequence frequency hopping(FHSS)
● Communication distance: 15 meters for the product (open space)
● Transmit power: 3dBm
● Receiving sensitivity: -80dBm
● Working current/matching current: 8/25mA,
● Size and weight: 78x34x16mm 29g(Without battery)
■Product packing list
● One BT578 serial port Bluetooth adapter
● One DB9 female-to-female adapter
● A 410mAh lithium battery(Built-in)
● A 220V-USB power adapter
● One USB charging cable
● A copy of the instruction manual
● A certificate of conformity and a warranty card