Digi XBee-PRO 900 Instruction Manual page 18

XBee‐PRO® 900 OEM RF Modules
1. Enable the preferred sleep coordinator on one of the nodes, and set its SP and ST to their
default values. The idea is to set these values short enough so that commands can be sent quickly
throughout the network which will set a longer sleep cycle.
2. Next, power on the other nodes within range of the sleep coordinator.
The nodes will receive the synch message and synchronize themselves to the short cycle SP and
ST.
3. Configure one or more of the nodes with the preferred sleep coordinator option.
Since they are already synched and in range of the sleep coordinator, they will not nominate
themselves.
4. Configure the nodes which do not have the preferred sleep coordinator option enabled with
SM4, putting them into cyclic sleep mode.
5. Reconfigure the sleep coordinator to the SP and ST values selected for the deployed network.
6. Wait a cycle for the sleeping nodes to synch themselves to the new SP and ST values.
7. Deploy the sleeping nodes to their positions.
8. Reconfigure the sleep coordinator node with SM4 to operate in sleep node and deploy the node.
Maintaining a Network
Use the following tasks to help maintain a network: adding a node--both normal and sleeping,
changing sleep parameters, and rejoining subnets operating out of synch.
Adding a Normal Node
To add a node to an existing network:
Power on the new node and deploy it within range of a node in the network. If there is a sleep
coordinator in the network, the new node will pick up the message when it is broadcast. Through
the synch message it will become aware of the network's wake and sleep time intervals, and the
time the next cycle will begin.
Adding a Sleeping Node
Adding a sleeping node to an existing network of sleeping nodes is easier if you use a node
operating in normal mode as an assist.
1. Set up a normal node in range of another node in the network.
2. Wait a cycle time for the normal node to synch with the network.
3. Configure the sleeping node with the command ATSM4, write the mode to the configuration
with ATWR, and reset the node.
4. Place the new sleeping node in range of the normal node. As the sleeping node wakes, it
realizes it is unsynched, and will request a synch message. The normal node will then respond
with a special unicast synch special unicast synch message. The new sleeping node will adjust its
configuration to match the synch message's contents, and a cycle later will wake in synch with the
rest of the sleeping network.
© 2008 Digi International, Inc. 18
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