In a previous topic about high-frequency NMEA output, it was mentioned that we should use a baud rate of 115200 or higher for modules like the K803 and K902. How do I actually change the baud rate of the serial ports?
Hello! You can easily configure the baud rate of any serial port using the COM command.
The basic format is to specify the port name followed by your desired baud rate. For example, if you want to set COM1 to a baud rate of 115200, you simply send the following command via your serial terminal: COM COM1 115200
If you are using COM2 or COM3, just replace COM1 in the command accordingly (e.g., COM COM2 115200). Supported baud rates typically include 9600, 19200, 38400, 57600, 115200, 230400, and 460800. And usually we use 115200 and 460800.
That makes sense. However, if I send this command while I am actively connected to COM1, will my connection drop?
Yes, that is a very important point!
If you change the baud rate of the exact port you are currently using to communicate with the receiver, the connection will instantly mismatch. You will likely start seeing garbled characters (random symbols) on your screen, and the module will stop responding to your current terminal window.
Don't worry, the module isn't broken! You simply need to:
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Disconnect your serial terminal software.
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Change the software's baud rate setting to match the new one you just set (e.g., switch it from 9600 to 115200).
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Reconnect to the port. You should then see the data outputting normally again.
