BT485 serial Bluetooth adapter can replace the traditional RS-485 cable within a range of about 100 meters, convert RS-485 connection into a Bluetooth connection, and thus realize wireless RS-485 communication. BT485 can be set as a Bluetooth master or slave by an Android app, and be used in a pair with one slave and one master, or in a network with one slave and multiple masters. The slave is connected to RS-485 master device, and the master is connected to RS-485 slave device, a BT485 slave can connect to up to 20 masters at the same time, and further connect up to 255 RS-485 slave devices through the BT485 masters. Adapt to RS-485 physical layer, support Modbus RTU and ASCII protocols. Simpler and more flexible networking than traditional wired RS-485 connection. The default Bluetooth role is slave, and can be set as a Bluetooth master. A Bluetooth slave can be connected to up to 20 Bluetooth masters at the same time. Bluetooth pairing encryption can enhance the security of wireless communication. Fast and large data transfer ability, the max RS-485 baud rate is up to 921600 bps. 10dBm transmiting power, communication distance up to 100 meters in open area. Built-in Watchdog, ensure long-term reliable and stable working. An Android app is supplied to set the adapter, without sending AT commands. 5V~36V wide DC power range, meet almost all power voltage of RS-485 devices. Serial TXD/RXD indicator can display the data activity on RS-485 serial port. Specifications • Bluetooth protocol: Version 5.1 BLE • Selectable RS-485 baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600 • TX power: 10dBm • RX sensitivity: -98dBm • Max wireless communication distance: 100 meters (line of sight) • Default RS-485 communication settings: 11