How Do I Send AT Commands Via RF To a Second XBee Module??

Wireless & IoT
1

I want to have two wireless XBee modules where module #1 is plugged into a Coridium ARMmite Wireless sku: DEV-08406, where a BASIC program will reside.

How do I send AT commands via RF to module#2 without those AT commands being interpreted by module#1?

To send AT commands to module #2 don’t I need to send +++ to module #2 and wait for an OK.

I don’t want RF module #1 to see the +++ sequence and enter it own command mode.

Do I need to set the command character of Module #1 to some unique character OTHER THEN +++? I could choose ^^^.

Then if I send +++ to module #2, module #1 would not recognize that sequence as the command mode sequence.

Is this the magic sauce I am looking for?

Thanks anyone for the guidance. I am a newbie.

Bill

2

You can’t issue remote AT commands in AT mode. You must either switch to API mode ( and lose transparent serial channel ) or have a program on the remote end to execute AT commands on remote Xbee and send results back. Look at my site, there is an article and C code demonstrating this technique.

3

Felis–Thanks for the response. If I use the CC command and select a new command mode character sequence as ^^^. Then if I just send ASCII text into module #1 and use the sequence +++, module #1 will not recognize this sequence as the command sequence because module #1 is looking for ^^^. However, the +++ characters will be sent out via RF and be received by Module#2, which WILL interpret the +++ as the command mode sequence. And module #2 will enter its command mode.

Then I can send commands to module #2 to get it to respond with I/O data.

How 'bout this? Will it work.

4

No.

In AT firmware, command mode doesn’t work from RF side at all. It’s all on the USART side - 3 pluses and any commands have to enter Xbee from DIN pin and any result gets sent out of DOUT pin.

Which Xbee are you using, BTW? I’m talking about series2.

5

I plan to use WRL-08742 XBee Pro 60mW Wire Antenna. I have the manual and am studying the various commands.

I understand what you are telling me. What I don’t understand is how to retrieve I/O data from a remote module using the RF link.

How do I get to your site?

6

felis; I did find your site via your profile.

7

You can program Xbee to transmit state of it’s pins, it will then run by itself, no MCU necessary. You can see how it can be done here-> http://www.ladyada.net/make/tweetawatt/

8

felis;

I have more questions. Shall I email you directly at general@circuitsathome.com?

Bill

9

This will work.