How does XBee Pro900 Coordinator operate?

XBee & XBee Gateway XBee - DigiMesh
1

Hi

The zigbee has the coordinator which contains the router list and synchronizes the sleep and wakeup of the network. Does the XBee Pro 900 have same function?

I read the datasheet and found there is a AT command “CE”, but when I send “ATCE” and get a “ERROR”, after “+++”.
If I send “CE” by AT Command of API mode:
7E0004080143456E,
I get the correct response: 7E00058801434502EC.
How to explain this “ERROR”?

The Xbee pro 900 has three modes:Normal, Indirect message coordinator, Polling device. If I have a server and multiple nodes around it, how do I set up them? The server is coordinator and the individual node is device, is it right? what does Normal mean?
If you can explain three modes in detail, I really appreciate.

Regards.

2

That API response is an error response. Here’s how the packet-check program decodes it:

[john@eccles ~]$ packet-check
API Packet analyzer version 1.2 for XBees (802.15.4, DigiMesh, ZNet, ZB)
Note: if it prompts for more bytes and you’re done, hit return
Enter packet: 7E00058801434502EC

Packet: 7E 00 05 88 01 43 45 02 EC
7E // Correct packet header byte
00 05 // payload length (decimal 5)
88 // Packet type: local AT response
// Valid for 802.15.4, DigiMesh, Znet2.5, ZigBee
01 // frame id
43 45 // AT command “CE”
02 // status: “Invalid command”
EC // checksum - correct

Note that status value…

Maybe you should double-check that you’re using the right data sheet.

(If you’d like to use packet-check for yourself, check out the pinned posts at the top of the 802.15.4 forum.)

3

Hi John,

Thanks for your reply.
I downloaded the latest datasheet “90000903_D.pdf - XBee Pro 900/900 DigiMesh RF Modules”. And then I read the page 39 which describes the CE command. It is really a little bit difference from the previous one. The CE has three options:

0-Router Normal mode (previously “Normal”)
1-Indirect messaging coordinator
2-End device. Nodes configured this way will not route data. Polling device.

But the module does not support “CE” both from AT command and API mode. How can I use this command?

Regards.

4

Hi

Ok, I admit it. At this point I’m stuck for ideas. Maybe someone else can join in and help.

What you could also do, though, would be to use X-CTU to save a .pro file giving your module’s settings. Then post that as an attachment.

I’m clutching at straws here - just working on the principle that the more we know, the more likely it is that we can spot something.

5

Hi

Thanks again.
At this stage, I just proceed software development with default setting. I think it is router normal mode. I can send commands to any remote devices and receive correct responce. Ok, it meets our requirement, so I might ignore the question now.