Connecting, Configuring & Upgrading

Once you have the XBee connected to a computer, you can experiment with connecting, configuring and upgrading the modules to the latest firmware.

Connecting

First, follow the wiring information in the previous section to connect up the XBee module. Note that if the module has correct power, the green LED should be blinking. If it isn't, check the wiring and verify that the XBee is getting power. Some versions or XBees the green LED doesnt blink, but it is on.

Next you'll need to open up a terminal program. Windows comes with Hyperterminal, so just use that. It's under Start->Programs->Accessories->Communications->HyperTerminal. If you are running a different operating system just use whatever terminal program is available for it, such as ZTerm, minicom, etc. Make sure you understand how those work since a confusion could cause a big headache.

When you open it up, it should ask you for a new connection. Lets name it "xbee"

Next, set the properties. Make sure you select 9600 bps, 8 bit, No parity, 1 stop bit and no flow control. Some programs may call this (9600 8N1). If the XBee has been configured for a different baud rate, of course, you should use that.

If you got an OK that means the XBee is powered and wired up correctly! If its not working, check:

• Try again, be sure to wait 10 seconds between each attempt at typing in +++ and type the +'s quickly
• Is the module powered? Green LED should be blinking
• Are RX & TX swapped?
• Do you have the correct baud rate? By default it should be 9600 baud 8N1 no hardware handshake but if it has been used for something else the baud rate might be different.

Next try typing in +++ (receive OK) and then AT and press return to get another OK This is basically how we can configure the XBee, by sending it AT commands (they all start with AT for ATtention). After a while, the XBee times out of configuration mode and goes back to pass-through connection mode. So if you want to get back to config mode, just type in +++ and it will start responding again.

Configuring with terminal

XBee's can be configured directly using a terminal program, or via a program such as Digi's XCTU program - which is specifically designed to make configuration easy.

For example, here are two examples of how configure the module's baud rate.

Using a terminal, you can change the baud rate using the ATBD command with a number afterwards that selects which baud rate to use:

• 0 = 1200
• 1 = 2400
• 2 = 4800
• 3 = 9600
• 4 = 19200
• 5 = 38400
• 6 = 57600
• 7 = 115200

-> +++ (get into AT mode)

-> AT (check if xbee modem is responding)
OK
-> ATBD (get current baud rate as above)
3 (9600)
-> ATBD 4 (set baud rate to 19200)
OK
-> ATBD (check again)
4
-> ATWR (write the baud rate change to flash)
OK

Then reset the module, either by pulling the reset pin low for a second or removing power (unplugging cable, etc) To connect now, set the terminal to use 19200 baud, otherwise the module will not respond! You can set it back to 9600 baud by giving it the command ATBD 3 and thenATWRiting it to the flash.

Configuring with X-CTU

Digi/Maxstream wrote a little program to help configure XBees, it's also the only way I know of to upgrade them to the latest firmware. Unfortunately it only runs on Windows.

After installing and starting the program, select the COM port (COM4 here) and baud rate (9600 is default). No flow control, 8N1

Hopefully the test will succeed. If you are having problems: check that the XBee is powered, wired correctly, the right COM port & baud rate is selected, etc.

The test will respond with the firmware version. Now we will change the baud rate for the modem using X-CTU.

Go to the Modem Configuration tab. This is where the modem is configured and updated.

You may want to skip ahead and upgrade the modem now, since it can be confusing if you don't have the latest firmware on it.

Scroll down in the settings pane until you find the Serial Interfacing -> Interface Data Rate setting. Click on the setting and select 4 for 19200 baud.

Upgrading with X-CTU

There's a good chance your XBee is not running the latest firmware & there's a lot of features added, so next up is upgrading!

Go to the Modem Configuration tab. This is where the modem is configured and updated.

Once you have downloaded the newest firmware, it's time to upgrade!

Click on Modem Parameters -> "Read" to read in the current version and settings.

Now you will know for sure what function set, version and settings are stored in the modem.

Select from the Version dropdown the latest version available.

That's it, now you have the most recent firmware for your modem. You should now uncheck the Always update firmware checkbox. If you have problems, like for example timing out or not being able to communicate, make sure the RTS pin is wired up correctly as this pin is necessary for upgrading. FTDI cables are already set up for this so you shouldn't have a problem.

Once you update the firmware, any configuration changes you've made such as Baud Rate adjustment will be thrown away.