How to call AT command on XBee from Arduino

Question

I am trying to set the SM (sleep mode) register on the XBee radio. These registers can be set with so called AT Commands, listed from pg. 28 in the XBee/XBee Pro Product Manual.

This can be done using the X-CTU desktop application, either by typing the AT commands in the built-in terminal or by editing the values in a list and then click "Write".

But is it possible to modify these registers on the fly from a sketch running on the Fio?

Answer 1

Yes you can modify this on the fly. Make sure you are sending the necessary characters first with the required timing. The default is +++

After Xbee replies "OK" you can send your AT commands. As Swanand said don't forget the 0x0D at the end

Answer 2

There you go.

void setup() {
  // Open serial connection to the xbee specifying the baud rate.
  Serial.begin(9600);

  // Define AT commands to rewrite the config once at startup
  // +++ -> Enters the AT mode
  // ATWR -> Saves the changes, ATAC doesn't work.
  // ATCN -> Exits AT mode
  // See http://widi.lecturer.pens.ac.id/Praktikum/Praktikum%20Mikro/XBee_ZB_ZigBee_AT_Commands.pdf
  const char *atcmds[] = {"+++", "ATNI Node_03\r", "ATWR\r", "ATCN\r"};

  // Write the commands to the xbee
  for(int i = 0;  i < sizeof(atcmds)/sizeof(atcmds[0]); i++){
     Serial.print(atcmds[i]);
     delay(1020);
  }
}

Answer 3

First of all, I never ever used an Arduino in my life but I have worked on XBee.

Yes, you can configure an XBee module on the fly. XBee accepts AT Commands. So the same commands you send from X-CTU are valid if you connect XBee to microcontroller serial port which is configured properly (in most cases, 9600 baud 8-N-1) and write over it.

Put your command in an array [AT] and write that array to serial port. You are done!

Note: All AT Commands are in ASCII and don't forget to add carriage return at the end (0x0D.)