Digi has developed a new kind of XBee product, the XBee-PRO 900HP. This device can operate with Zigbee firmware and DigiMesh firmware. The main advance of this chip is because it can operate at longe range distances, up to 40 miles (64Km).
There are two types of firmware: XBP9B-DM is DigiMesh and XBP9B-DP is MultiPoint.
If you already configured other XBee product using X-CTU software then you will notice this firmware doesn’t have the “MY – 16 bits Network Address”, this is because DigiMesh doesn’t use Network Address but only the 64 bits MAC Address to communicate.
Then if you want to create a “communication mesh link” between two XBee-PRO 900HP modules you need to configure module A’s “DH – Destination Address High” and “DL – Destination Address Low” with the respective module B’s “SH – Serial Number High” and “SL – Serial Number Low”.
Xbee 1 (coordinator): firmware version: 8070 preamble ID: 1 network ID: 123 routing/messaging mode: 1 - INDIRECT MSG COORDINATOR destination address high: (DH of XBee 2) destination address low: (DL of XBee 2) API enable: 2 Transmit option: 0xC0 Xbee 2 (router): firmware version: 8070 preamble ID: 1 network ID: 123 routing/messaging mode: 0 - STANDARD ROUTER destination address high: (DH of XBee 1) destination address low: (DL of XBee 1) API enable: 2 Transmit option: 0xC0
Digi lacks more documentation about these modules, it is not that easy to figure out an ordinary information like that.
Update: A good starting tutorial (not exactly to XBee-PRO 900HP) is this here: http://creativeelectron.net/blog/2009/09/xbee-making-your-first-application-2/