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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?

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2 Answers

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First of All, I never ever used Arduino in my Life but I have worked on XBee.

Yes, You can configure 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)

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The only way I know of sending anything to the radio is Serial.println() or Serial.print(). But all the XBee does is send those commands into the ether. I can hardly believe that it reads the characters passing through and if some of that looks like a command, then it executes that command instead. Please tell me if I misunderstood? Btw: I can't even test the commands with X-CTU because of another problem, described here. – Lucy Brennan Jun 7 '12 at 15:47
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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

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This is all you need, send Serial.print("+++") to enable AT mode, wait for OK from the Xbee, and you can send the AT commands. To disable the AT mode, you can either wait a few seconds or send Serial.print("ATCN\r"). Never forget to send Carriage Return at the end of the AT commands, the only one that doesn't need CR is the +++ command – Jamiro14 Jun 22 '12 at 9:45

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