User's Manual

Then ,switching the H switch to ON state, J switch to ON state； Press the F button PWRKEY for about
2 second, then the LED glint，and the module is tuningup successfully；( the location of All Switches and
buttons please see the Figure 1)
2.2 Serial interfaces
The module provides two unbalanced asynchronous serial ports. One is the serial port ,the other is the
debug port. The module is designed as a DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. The module and the client (DTE) are connected
through the following signal (as following figure shows). Autobauding supports baud rate from 4800bps to
115200bps.
Serial port
z TXD: Send data to the RXD signal line of the DTE
z RXD: Receive data from the TXD signal line of the DTE
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